bluuebunny/crossref_metadata_2025 huggingface dataset:
Electrochemical Behavior of Cu2+-Histidine Complexes on a Glassy Carbon Electrode
Authors: Weng Yu-Ching , Cheng Tian-Hao
Published: February 2015

The electrochemical behavior of Cu2+-L-histidine complexes on a glassy carbon electrode with various coordination environments in aqueous solution has been investigated. The Cu2+-histidine complexes are more easily reduced and oxidized at low pH (pH = 3 ~ 4) than at high pH (pH = 8 ~ 10). Both reduction and oxidation reactions of the Cu2+-histidine complexes are controlled by mass transfer at medium (pH = 5 ~ 7) and high pH (pH = 8 ~ 10) solutions. Even if the molar ratio of histidine to Cu2+ ions is as high as 100 : 1 at low pH of 4, the complexes are easily reduced to form Cu metal directly on the electrode surface. Glassy carbon rotating disk electrode experiments have shown that the electron transfer of the reduction reaction of the Cu2+-histidine complexes is close to 2.
A Short Synthesis of Rhaponticin and its 3”-Fluoroanalog via a Wittig/Heck-Mizoroki Route
Authors: Csuk René , Albert Sabrina
Published: February 2015

Rhaponticin and its 3”-fluoroanalog have been prepared from easily accessible starting materials. The key step of these syntheses is the silver carbonate-mediated glycosidation reaction employed for the selective formation of a β -glycosidic bond. A palladium acetate-catalyzed Heck-Mizoroki reaction in triethanolamine established an (E) configuration in the stilbene with simultaneous deprotection of the carbohydrate.
First Total Synthesis of 3-Epi-calystegin B2
Authors: Csuk René , Reißmann Stefan , Kluge Ralph , Ströhl Dieter , Korb Claudia
Published: February 2015

A straightforward chiral pool synthesis for a non-natural calystegin, 3-epi-B2, is described. Key steps of this synthesis include an ultrasound-assisted Zn-mediated tandem ring opening reaction followed by a Grubbs’ catalyst-mediated ring closure metathesis reaction. Compared to calystegin B2, the target compound is no longer an inhibitor for a β -glycosidase hence proving that an equatorial hydroxyl group at position C-3 is necessary for a tight binding of calystegins into the active site of β -glycosidases.
Silver-free Gold(I) Catalysts for Organic Transformations
Authors: Schmidbaur Hubert , Schier Annette
Published: February 2015

The majority of gold(I) catalysts employed in organic transformations in homogeneous systems are presently generated in situ by reactions of gold halides AuX or their 1 : 1 complexes [(L)AuX] with silver salts AgY (X = Cl, Br; L = R3P, NHC, tht etc.; Y = BF4, PF6, SbF6, OSO2CF3, OC(O)CF3 etc.). This usage of silver salts is not only economically unfavorable, but also has several practical disadvantages regarding inter alia the thermal and photochemical stability of the reaction mixtures, problems of inexact stoichiometries, difficulties in separation and recycling, and cooperative effects due to Au-Ag metallophilic interactions which can induce a different course of the reactions. There is therefore a move towards syntheses of silver-free homogeneous gold(I) catalysts. The past and current approaches and opportunities are summarized in this review.
Structure andMagnetic Properties of a Three-dimensional Metal-organic Framework: [Co(L)(H2O)2]·H2O
Authors: Chen Man-Sheng , Deng Yi-Fang , Chen Zhi-Min , Zhang Chun-Hua , Kuang Dai-Zhi
Published: February 2015

A unique 3D fourfold interpenetrated metal-organic framework, [Co(L)(H2O)2]・H2O (1), has been synthesized by the solvothermal reaction of H2L with Co(NO3)2・6H2O (H2L = 5-(isonicotinamido) isophthalic acid). Compound 1 crystallizes in the monoclinic space group P21/c, with the cell parameters: a = 81301(8), b = 107711(11), c = 167697(16) Å , β = 92.656(2) °, V = 14669(3) Å3, R1 = 0.0325 and wR2 = 0.0833. Its framework has (10,3)-b topology, where the cobalt atoms are alternately bridged by the pyridyl and the carboxylate groups of the L2− ligands into a three-dimensional network. Compound 1 displays antiferromagnetic interactions. Above 40 K, χm −1 obeys the Curie- Weiss law with C = 3.28 emu Kmol−1 andΘ = −0.66 K.
Sulfur and SeleniumActivation by Frustrated NHC/B(C6F5)3 Lewis Pairs; Conformational Flexibility of Products
Authors: Holschumacher Dirk , Daniliuc Constantin G. , Jones Peter G. , Tamm Matthias
Published: February 2015

Frustrated Lewis pairs consisting of N-heterocyclic carbenes (NHC) and the borane B(C6F5)3 react with elemental sulfur or selenium to give products of the type NHC-E-B(C6F5)3, where E is S or Se. Three such products, two with sulfur and one with selenium, were characterized by X-ray diffraction and shown to exhibit considerable conformational flexibility, as revealed by differing torsion angles in the atom sequence N-C-E-B-Cipso-Cortho. In the sulfur derivatives, the S-B bonds are all long (ca. 2.05 Å), and the C-S bonds (ca. 1.73 Å) are clearly lengthened compared to imidazole-2-thiones. The Se-B distance of 2.2111 Å is the first selenone-borane bond length to be determined by X-ray analysis.
Metal-Fluorocarbon Pyrolants. XII: Calciumsalze der 5-perfluoroalkylierten Tetrazole – Synthese, Charakterisierung und Leistungsbewertung als Oxidationsmittel in ternären Mischungen mit Magnesium und VitonTM/ Metal-Fluorocarbon Pyrolants. XII: Calcium Salts of 5-Perfluoroalkylated Tetrazoles – Synthesis, Characterization and Performance Evaluation as Oxidizers in Ternary Mixtures with Magnesium and VitonTM
Authors: Koch Ernst-Christian , Klapötke Thomas M. , Radies Hendrik , Lux Karin , Hahma Arno
Published: February 2015

5H-Perfluoroalkyltetrazoles (alkyl = CF3, C2F5, C3F7) react with aqueous Ca(OH)2 to give the corresponding calcium salts 1, 2 and 3. Compounds 1 - 3, which form hydrates, were characterized by elemental analyses, differential heat flow calorimetry, multinuclear NMR, FTIR and Raman spectroscopy. A crystal structure determination was carried out on the solvate 2 ·2H2O·4CH3OH. Compounds 1 - 3 were tested as oxidizers in ternary pyrolant mixtures with magnesium and VitonTM. The burn rates, u (g s−1), of the pyrolants based on 1 show a distinct influence of the exothermicity of the primary reaction, whereas the burn rates of 2- and 3-based pyrolants do not show such behavior but display a steady increase of burn rate with increasing Mg content. At stoichiometries below 40 wt.-% Mg, the specific intensity Eλ (J g−1 sr−1) of the pyrolants based on 2 and 3 is superior to that of the standard mixture magnesium/polytetrafluoroethylene/VitonTM (MTV). This is assumed to be due to the expansion of the flame envelope by nitrogen.
Synthesis and Characterization of the nido-Platinaborane 7,7-(PPh3)2-7-PtB10H11-11-OC(O)Me
Authors: Miao Jinling , Nie Yong , Chen Haiyan , Wang Daqi , Enders Markus , Siebert Walter , Sun Guoxin , Dou Jianmin
Published: February 2015

The reaction of closo-B10H10
2− with PtCl2(PPh3)2 in the presence of MeCOSH afforded the title platinaborane nido-7,7-(PPh3)2-7-PtB10H11-11-OC(O)Me (1), which has been characterized by IR and NMR spectroscopy, MS, elemental analysis, and single-crystal X-ray diffraction. In contrast to the known products having exo-polyhedral Pt-S-C-O-B ring(s) from the same reaction with Ph- COSH, compound 1 has a B-acetoxy group on the open PtB4 face of the nido-PtB10 cluster. The structure of 1 features both intramolecular/intermolecular C-H· · ·O hydrogen bonds and intramolecular C-H· · ·H-B dihydrogen bonds, which link the molecules into a 1-D chain structure.
Weak Hydrogen Bonds in the Molecular Packing of N-Tetraalkyl Terephthalamides
Authors: Jones Peter G. , Kuś Piotr
Published: February 2015

We present the structures of eight terephthaldiamides, seven of which (1 - 7) are fully substituted at both nitrogens and so cannot form classical hydrogen bonds. The structure of N,N´-dimethyl- N,N´-diphenylterephthalamide (7) represents a new polymorph. Where possible, the molecules tend to exhibit inversion symmetry. The amide groups are rotated significantly out of the central aromatic plane, by 33° to 84° (average 54°). The carbonyl carbon of the amide group may lie significantly (ca. 0.1 - 0.2 Å ) out of the aromatic ring plane. The packing patterns exploit those types of contact still available, namely C-H· · ·O (especially) and C-H· · ·π. The smaller substituents in general lead to simpler packing patterns such as layer structures; more complex substituents can lead to three-dimensional patterns of great complexity. The central ring tends to play less of a role as the substituents become larger. Phenyl substituents often use their para hydrogen atoms to form intermolecular contacts, presumably because they are sterically more exposed. One terephthaldiamide (8) with two NHR groups forms a mixed “classical and weak” bifurcated (N-H, o-C-H)· · ·O hydrogen bond system.
Synthesis and X-Ray Crystal Structure Analysis of 1,4-Epoxy-4-methyl- 1H,4H-2,3-benzodioxepin
Authors: Giera David S. , Hennig Lothar , Gelbrich Thomas , Schneider Christoph
Published: February 2015

Ozonolysis of 2-methyl-1H-indene (1) afforded the stable secondary ozonide 1,4-epoxy-4-methyl- 1H,4H-2,3-benzodioxepin (2). This compound crystallizes in two polymorphic forms, depending on the solvent used. The monoclinic form 2a containing two symmetry-independent molecules (enantiomers) is obtained by crystallization from dichloromethane. In contrast, the orthorhombic modification 2b is obtained from ethyl acetate solution and crystallizes as a conglomerate of enantiomerically pure single crystals. Additionally, the ring-opened product 2-(2-oxopropyl)benzoic acid (3) was obtained and investigated by X-ray crystal structure analysis.
New Quaternary Indides RE7Ni5–xGe3+xIn6 (RE = La, Nd, Sm)
Authors: Dominyuk Nataliya , Zaremba Vasyl I. , Pöttgen Rainer
Published: February 2015

The quaternary indides RE7Ni5−xGe3+xIn6 (RE = La,Nd, Sm) were synthesized from the elements by arc-melting. Single crystals were grown by slow cooling of the polycrystalline samples. The structures were characterized by powder and single-crystal X-ray diffraction: Ce7Ni4.73Ge3.27In6 type, P6/m, Z = 1, a = 1147.05(9), c = 426.82(4) pm, wR2 = 0.0652, 528 F2 values for La7Ni4.46Ge3.54In6, a = 1134.5(7), c = 407.1(7) pm, wR2 = 0.0419, 441 F2 values for Nd7Ni4.91Ge3.09In6, and a = 1133.5(2), c = 404.3(1) pm, wR2 = 0.0619, 498 F2 values for Sm7Ni4.31Ge3.69In6, with 25 parameters per refinement. Characteristic features of the RE7Ni5−xGe3+xIn6 structures are hexagonal, AlB2-related prisms around the RE1 atoms and a tricapped, trigonalprismatic coordination of the nickel atoms
Synthesis and Structure of the Ternary Vanadate NaMn4(VO4)3
Authors: Yahia Hamdi Ben , Gaudin Etienne , Rodewald Ute Ch. , Pöttgen Rainer
Published: February 2015

The vanadate NaMn4(VO4)3 was obtained as darkbrown crystals as a side-product during the crystallization of the oxygen-deficient perovskite Na3MnV2O7.5 in an NaCl/KCl flux. NaMn4(VO4)3 crystallizes with the tetragonal (Mg1/2□1/2)Mg4(AsO4)3 type, space group I 4̄2d. The structure was refined from single-crystal diffractometer data: a = 7.0238(2), c = 19.8360(9) Å , R(F) = 0.013, wR(F2) = 0.033, 853 F2 values, and 49 variables. The NaMn4(VO4)3 structure is built up of different sheets stacked perpendicular to the c axis. Na, Mn and V atoms are located in dodecahedra, octahedra and tetrahedra, respectively.
A Quantum Chemistry Approach to the Force Fields of the Asymmetrical Thionyl Halides FS(O)Cl, CF3S(O)F and CF3S(O)Cl
Authors: Coronel Angelina del C. , Gargiulo Myriam E. , Varetti Eduardo L. , Fernández Lis E.
Published: February 2015

The vibrational properties of the asymmetrical thionyl halides FS(O)Cl, CF3S(O)F and CF3S(O)Cl were studied by means of density functional theory (DFT) techniques. The available experimental data and assignments for these molecules were compared with the theoretical results and revised. These data were subsequently used in the definition of the corresponding scaled quantum mechanics (SQM) force fields. A set of internal force constants was also calculated from such force fields
Synthesis and Crystal Structure of a New Cd(II) Coordination Polymer Based on a 1,10-Phenanthroline Derivative
Authors: Xu Zhan-Lin , Ma Shuai , He Yu , Kong Zhi-Guo
Published: February 2015

The new coordination polymer [Cd(oct)(L)] (H2oct = octanedioic acid and L = 2-(4-fluorophenyl)-1H-imidazo- [4,5-f][1,10]phenanthroline) has been synthesized under hydrothermal condition and characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. Crystal data: C27H23CdFN4O4, monoclinic, space group C2/c, a = 21.391(4), b = 18.180(4), c = 14.031(3) Å , β = 116.50(3), V = 4883(2) Å3, Z = 8. The flexible oct dianions bridge the Cd(II) cations to yield a double-chain structure. The L ligands are attached on both sides of the chains, and their π-π interactions between neighboring chains result in two-dimensional supramolecular layers
Synthesis and Crystal Structure of a Meso-Meso Directly Linked Bisporphyrin
Authors: Senge Mathias O. , Pintea Monica , Ryan Aoife A.
Published: February 2015

We report the synthesis and characterization of a meso-meso directly linked bisporphyrin 6 bearing both alkyl and aryl residues. Its oxidative fusing results in the corresponding meso-meso β -β ,β -β - linked bisporphyrin. The first crystal structure analysis of a meso-meso directly linked porphyrin dimer (6) has shown the inequivalency of the two porphyrin units with regard to the macrocycle conformation. Quite distinct mixings of distortion modes were observed for the two aromatic macrocycles.
Enamines in Heterocyclic Synthesis: A Novel Simple and Efficient Route to Condensed Pyridazines
Authors: Darwish Elham S. , Abdelrahman Mahmoud A. , Salaheldin Abdellatif M.
Published: February 2015

An efficient and easy preparation of enamine derivatives, via active methyl and methylene compounds by in situ-generated 1-(diethoxymethyl)piperidine, produced from the mixture of triethyl orthoformate/piperidine/DMF, are described. Some new pyridazinone derivatives have been synthesized from the reaction of enamines with hydrazine hydrate and cyanoacid hydrazide.
Heterogeneously Catalyzed Diastereoselective Synthesis of 2-Nitro-1,3-di(pyridin-2-yl)propane-1,3-diols
Authors: Schulz Martin , Wimmer Katja , Görls Helmar , Westerhausen Matthias
Published: February 2015

2-Nitro-1,3-di(pyridin-2-yl)propane-1,3-diols 4a, 4b are prepared via nitroaldol (Henry) reaction in two separate steps by straightforward procedures. The employment of two solids as catalysts, namely the hydrotalcite Syntal 696® and the ion exchange resin Amberlyst A21® allows a simple work-up and leads to the diastereoselective formation of the (R,R)- and (S,S)-isomers. The solid-state structures of 4a, 4b as well as of their precursor compounds 3a and 3b were determined. Reaction of 4a with zinc chloride yields a mononuclear zinc chloride complex. To circumvent retro-reactions, trialkylsilyl protective groups are deployed.
2-Hydroxy-luisol A, a New Quinone-derived Tetraol from a Marine Streptomyces sp. and Oxidation Products of Luisol A*
Authors: Fotso Serge , Fotso-Fondja Yao Clarisse B. , Helmke Elisabeth , Laatsch Hartmut
Published: February 2015

In addition to luisol A (1a), luisol B (2), and aloesaponarin II, the marine streptomycete B7617 produced a new derivative of 1a, 2-hydroxy-luisol A (1b). In an attempt to increase the biological activity, luisol A (1a) was oxidized and delivered with Jones reagent or by Swern oxidation the derivatives 3a/3b and 4a/4b, respectively, but none of these compounds showed antimicrobial or cytotoxic activities. All structure elucidations are based on 2D NMR analyses or were derived by comparison with published data.
Synthesis, Characterization and Structure of Tribromo(2-phenyl- 1,8-naphthyridine)gold(III)
Authors: Schmidt Ricardo , Moya Sergio A. , Aguirre Pedro , Fuentealba Mauricio , Leboschka Markus , Sieger Monika , Niemeyer Mark , Kaim Wolfgang
Published: February 2015

Neutral tribromo(2-phenyl-1,8-naphthyridine)gold(III), AuBr3(N-N), has been prepared by reaction of KAuBr4 with the ligand in CHCl3/C2H5OH and was characterized by 1H NMR spectroscopy and X-ray diffraction. The molecular and crystal structure of AuBr3(N-N) · 0.5 THF (triclinic, P1̄, a = 11.314(2), b = 12.350(3), c = 14.628(3) A° , α = 107.96(3), β = 98.86(3), γ = 107.29(3)◦, Z = 4, 173 K) shows coordination of the N8 nitrogen atom situated in the unsubstituted pyridine ring to the planar four-coordinate AuIII center. Whereas the AuBr3N best planes and the coordinated naphthyridine rings are not far from orthogonal (ω ~ 105◦), the phenyl substituents were found in the crystal with a ca. 22◦ dihedral angle relative to the naphthyridine plane. Intermolecular Au· · ·Br distances close to the sum of the van der Waals radii indicate very weak interactions to form a quasi-dimeric arrangement in the crystal.
Untersuchungen zur Reaktivität des Lithiumphosphanids Li[PtBu2] gegenüber GaCl3 / Investigations of the Reactivity of the Lithiumphosphanide Li[PtBu2] towards GaCl3
Authors: Lerner Hans-Wolfram , Sänger Inge , Schödel Frauke , Bolte Michael , Wagner Matthias
Published: February 2015

Single crystals suitable for X-ray diffraction of (tBu2P)3Ga (monoclinic, space group Cc) were obtained from GaCl3 and two equivalents of Li[PtBu2] at room temperature in benzene. The phosphanylgallane (tBu2P)3Ga was also produced via a one-pot approach by reaction of GaCl3 with three or more than three equivalents of Li[PtBu2]. However, treatment of one equivalent of GaCl3 with one equivalent of Li[PtBu2] and subsequent protolysis yielded [tBu2PH2][tBu2P(GaCl3)2 - Li(Cl3Ga)2PtBu2]. Single crystals of this phosphonium salt (monoclinic, space group Cc) were obtained from benzene at room temperature.
Isomers of Diformyl[2.2]paracyclophane; X-Ray Structure Determinations of the Pseudo-ortho Isomer and Two Polymorphs of the Pseudo-meta Isomer
Authors: Jones Peter G. , Dix Ina , Negru Mihaela , Schollmeyer Dieter
Published: February 2015

Pseudo-ortho- or 4,16-diformyl[2.2]paracyclophane (1) and two polymorphs of pseudo-meta- or 4,13-diformyl[2.2]paracyclophane (2) all display the usual features of [2.2]paracyclophane strain (lengthened C-C bonds and widened C-C(sp3)-C angles in the bridges, narrower sp2 ring angles at the bridgehead atoms, and flattened boat conformations of the rings). All bulk samples were racemates. Polymorph 2a crystallizes in space group P21/n with one molecule in a general position, whereas 2b crystallizes in space group C2 with two independent molecules, each with crystallographic twofold symmetry. All three molecules of 2 are different rotamers with respect to the formyl groups; in 2a one is endo and one exo to the neighbouring bridge, whereas in 2b both formyls are exo in one molecule and endo in the other. In all compounds, the packing patterns are preponderantly associated with C-H・ ・ ・O contacts. In 1 the molecules are connected to form tubes parallel to the short a axis. 2a consists of two interconnected layer structures. One is parallel to (100) and involves chains of molecules parallel to [01̄1]; the other is parallel to (001) and involves chains of molecules parallel to the b axis. 2b consists of two hexagonal layers, one for each independent molecule, parallel to (001). One layer contains bifurcated (C-H・ ・ ・ )2O systems, whereas the single H・ ・ ・O interactions in the other are long and markedly bent.
A Simple Route to Benz[a]acridinium Salts
Authors: Hartmann Horst
Published: February 2015

By reaction of N-substituted N-phenyl-2-naphthylamimes with the Vilsmeier reagent N-substituted benz[a]acridinium salts are formed in satisfactory yields.
Haliclocyclin C, a New Monomeric 3-Alkyl Pyridinium Alkaloid from the Arctic Marine Sponge Haliclona viscosa
Authors: Schmidt Gesine , Timm Christoph , Köck Matthias
Published: February 2015

For the first time, the macrocyclic monomeric 3-alkyl pyridinium alkaloid with an alkyl chain of 13 methylene groups, haliclocyclin C (1), could be identified from a natural source in the crude extract of the Arctic sponge Haliclona viscosa. Structure elucidation was carried out by comparison of the natural product with the corresponding synthetic compound.
Aluminium-Germanide der zweiwertigen Lanthanoide Eu und Yb: Synthese, Strukturchemie und chemische Bindung
Authors: Bauer Britta , Röhr Caroline
Published: February 2015

In the course of attempts to substitute Ca by Yb and Sr by Eu in known alkaline earth Al-germanides, the four new ternary compounds Eu3Al1.8Ge2.2, Eu3 Al2Ge4, Yb2 AlGe3, and Yb17Al8Ge19 have been synthesized from mixtures of the elements and their crystal structures determined by means of single-crystal X-ray data. The two europium compounds Eu3Al1.8Ge2.2 (Ta3B4 structure type, orthorhombic, space group Immm, a = 417.68(3), b = 470.70(3), c = 1897.2(2) pm, Z = 2, R1 = 0.0439) and Eu3Al2Ge4 (Sr3Al2Ge4 structure type, monoclinic, space group C2/m, a = 1235.9(6), b = 416.8(2), c = 878.4(4) pm, β = 110.615(13)°, Z = 2, R1 = 0.0978) are isotypic with the corresponding strontium phases. After ionic decomposition, the layers [Al2
- Ge4
- ]6− in Eu3Al2Ge4 with four-bonded Al and three-bonded Ge atoms can be interpreted as electron-precise Zintl anions. In contrast, the planar ribbons 1
∞[Al2/2Ge2Al2/2] of condensed six-membered rings in Eu3Al1.8Ge2.2 exhibit considerably shorter Al-Ge bonds and an Al-Al bond length of only 251 pm. Yb2AlGe3 (orthorhombic, space group Pnma, a = 682.20(10), b = 417.87(9), c = 1813.9(3) pm, Z = 4, R1 = 0.0415) crystallizes with the Y2AlGe3 structure type. Folded [Al2Ge2] ladders, also found in Eu3Al2Ge4 and the known compound Yb7Al5Ge8, are connected by planar cis/trans chains of Ge atoms. The total density of states calculated within the FP-LAPW|DFT band structure approach shows a distinct minimum at the Fermi level for the electron precise Zintl compound Eu3Al2Ge4, whereas π-bonding contributions are evident from the band structures of Eu3Al2Ge2 and Yb2AlGe3. In full accordance, the tDOS of both compounds exhibits no minimum at EF, small phase widths are possible for Eu3Al2Ge2 and related alkaline earth compounds, and Yb2AlGe3 is isotypic with several other more electron-rich LnIII compounds. The complicated structure of the new compound Yb17Al8Ge19 (tetragonal, space group P4/nmm, a = 1542.50(2), c = 788.285(8) pm, Z = 2, R1 = 0.0282) contains three different building blocks: distorted [Al4Ge4] heterocubane units are interconnected by four-bonded Ge atoms to form columns running along the c axis. Secondly, eight-membered rings are formed by alternating Al and Ge atoms, each being in a trigonal-planar Al/Ge coordination. The rings are terminated by Ge atoms (bonded to Ge of the ring) and linked to the first structural unit by a further Ge atom (bonded to Al of the ring). Thirdly, inside the large channels, which are formed by the packing of the eightmembered rings, Ge2 dumbbells are interspersed as a third structural element.
The Mixed Lanthanum Dichalcogenide β-LaS1.86(1)Se0.14(1). Synthesis, Crystal Structure, Raman Spectrum and Optical Band Gap
Authors: Bartsch Christian , Doert Thomas
Published: February 2015

The ternary lanthanum sulfide selenide β -LaS1.86(1)Se0.14(1) was obtained by reaction of the elements in an NaCl flux. The new compound adopts the β -LnS2 structure type and crystallizes in the orthorhombic space group Pnma (no. 62) with lattice parameters of a = 814.77(1), b = 1638.46(1) and c = 413.88(1) pm. Raman lines indicate the presence of mixed (S1−ySey)2− dianions with y ≈ 0.14, besides the well known S2
2− dianions. The band gap of β -LaS1.86(1)Se0.14(1) is 2.5 eV as determined by optical spectroscopy.
Solvothermal Syntheses and Crystal Structures of New One-dimensional Selenogallates [bappH2][Ga2Se4] (bapp = 1,4-Bis-(3-aminopropyl)piperazine) and [Mn(en)3][Ga2Se5] (en = Ethylenediamine)
Authors: Xu Chao , Zhang Jing-Jing , Duan Taike , Chen Qun , Zhang Qian-Feng
Published: February 2015

Two new selenogallates, [bappH2][Ga2Se4] (1) (bapp = 1,4-bis(3-aminopropyl)-piperazine) and [Mn(en)3][Ga2Se5] (2) (en = ethylenediamine), have been synthesized under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction. Compounds 1 and 2 contain one-dimensional polymeric chains {[Ga2Se4]2−}∞ and {[Ga2Se5]2−}∞, respectively. The negative charges of the polymeric chains are balanced by a protonated 1,4-bis(3-aminopropyl)piperazine cation in 1 and by the metal-amine complex cations [Mn(en)3]2+ in 2. TGA analyses have shown that compound 2 is thermally more stable than compound 1.
Synthesis and Characterization of the Manganese Borate α-MnB2O4
Authors: Neumair Stephanie C. , Perfler Lukas , Huppertz Hubert
Published: February 2015

The high-pressure manganese borate α-MnB2O4 was synthesized under high-pressure/hightemperature conditions of 6.5 GPa and 1100 ◦C in a modified Walker-type multianvil apparatus. The monoclinic compound is isotypic to α-FeB2O4, CaAl2O4-II, CaGa2O4, andβ -SrGa2O4 crystallizing with eight formula units in the space group P21/c (Z = 8) with the lattice parameters a = 712.1(2), b = 747.1(2), c = 878.8(2) pm, β = 94.1(1)◦, V = 0.466(1) nm3, R1 = 0.0326, and wR2 = 0.0652 (all data). The compound is built up from layers of “sechser” rings of corner-sharing BO4 tetrahedra that are interconnected to a three-dimensional network. The manganese ions are coordinated by seven oxygen atoms and situated in channels along the a axis.
Structure, Electrochemical and Magnetic Properties of a New Dinuclear Copper(II) Complex: [Cu2(C12H6O4N2)2(2,2`-bipy)2] ·CH3OH
Authors: Yang Ying-Qun , Chen Man-Sheng , Li Wei , Chen Zhi-Min
Published: February 2015

Assembly reaction of copper(I) chloride, 2,2`-bipyridine-3,3`-dicarboxylic acid (H2L) and 2,2`-bipyridine results in the formation of a new complex [Cu2(C12H6O4N2)2(2,2`-bipy)2] ・CH3OH (1). In 1, two L2− ligands link two Cu(II) ions to form a dinuclear structure. The electrochemical and magnetic properties of 1 were investigated. The results show that the electron transfer is irreversible in the electrode reaction, corresponding to Cu(II)/Cu(0). 1 is paramagnetic and exhibits a weak antiferromagnetic coupling.
Preparation of Silver Nanoparticles Suitable for Textile Finishing Processes to Produce Textiles with Strong Antibacterial Properties against Different Bacteria Types
Authors: Mahltig Boris , Reibold Marianne , Gutmann Emanuel , Textor Torsten , Gutmann Jochen , Haufe Helfried , Haase Hajo
Published: February 2015

This study describes the development of a preparation technique for silver nanoparticles useable as antimicrobial material which is especially useful for textile treatment to realize antimicrobial fabrics. The silver particles need to be prepared by reduction of AgNO3 under moderate conditions and with a moderate and non-toxic reductive agent. Comparative investigations were carried out with silver particles prepared by a solvothermal process or with NaBH4 as reductive agent. Particularly, suitable silver solutions are obtained by stabilizing the silver particles with polyvinylpyrollidone PVP of high molecular weight (Mw ~ 360000 gmol−1) and the use of the non-toxic reductive agents ascorbic acid and fructose. Under these conditions the diameters of the silver particles are in the range of 10 to 30 nm as determined by HR-TEM. The formation of elemental silver has been verified by transmission electron microscopy (TEM), X-ray diffraction (XRD) and optical spectroscopy. The properties of silver particle-containing liquids were investigated by using UV/Vis spectroscopy and dynamic light scattering. Further information on particle size and size distribution was gained through SEM investigations. The prepared solutions of silver nanoparticles can be applied easily onto textiles as liquid coating agents. All prepared textile samples exhibited a high antimicrobial activity against Escherichia coli. However, only few solutions containing silver particles of smaller size exhibit high antimicrobial activity also against other types of bacteria such as Staphylococcus aureus and Streptococcus pneumoniae. Because of this high antimicrobial potential gained with silver solutions prepared in a simple process without usage of toxic components, the developed materials offer a broad range of potential applications.
CO2 as an Oxygen Source for Polysiloxanes – Preparation, Crystal Structure and Thermal Decomposition of Two Novel Silylcarbamates
Authors: Wiltzsch Conny , Kraushaar Konstantin , Schwarzer Anke , Kroke Edwin
Published: February 2015

Diaminosilanes (CH3)2Si(NHR)2 1a, b are obtained from dichlorodimethylsilane and primary amines (R = n-hexyl, iso-propyl) in good yields. Bis-insertion of CO2 into the Si-N bonds of the aminosilanes quantitatively gives the silylcarbamates (CH3)2Si(OCONHR)2, 2a, b. Oligo- and polydimethylsiloxanes 3a, b as well as N,N`-substituted ureas CO(NHR)2 4a, b are formed upon heating the silylcarbamates 2a, b to ~ 150 ◦C. The results of comprehensive NMR analyses of the aminosilanes, the two novel bis-silylcarbamates, the siloxanes and the ureas, and of single-crystal structure analyses of 2a and 4b are presented. In the crystal the n-hexyl silylcarbamate 2a shows a similar molecular packing arrangement as the iso-propyl urea derivative 4b.
Synthesis and Characterization of o-Carboranylthioether Derivatives
Authors: Xu Meiling , Nie Yong , Miao Jinling , Zhang Zhenwei , Peng Bin , Sun Guoxin
Published: February 2015

The reactions of the dithiolato-o-carborane salt (Et3NH)2(S2C2B10H10) (2) with alkyl halides BrCH2CH=CH2, BrCH2CH2CH2Cl and C6H5CH2Cl, afford the o-carboranyl-bisthioether derivatives 3a - c, which have been characterized by IR and NMR (1H, 13C, 11B) spectroscopy, mass spectrometry, and single-crystal X-ray diffraction (3c). The photoluminescent properties of the known compound 3c has been investigated. It exhibits a violet (chloroform solution) or blue (solid state) emission when excited with UV light.
Magnetic Properties of RE3Pd6Sb5 (RE = Pr, Nd,Gd) and a Group-Subgroup Scheme for Ce3Pd6Sb5 and Yb5Cu11Sn8
Authors: Schellenberg Inga , Hoffmann Rolf-Dieter , Seidel Stefan , Schwickert Christian , Pöttgen Rainer
Published: February 2015

The Ce3Pd6Sb5-type antimonides RE3Pd6Sb5 (RE = Pr, Nd, Sm, Gd, Tb) were synthesized by arc-melting and subsequent annealing in sealed silica ampoules in a high-frequency furnace. The new compounds Sm3Pd6Sb5 (a = 1337.0(5), b = 441.5(1), c = 988.6(3) pm) and Tb3Pd6Sb5 (a = 1328.8(4), b = 439.9(2), c = 976.6(5) pm) were characterized by powder X-ray diffraction data. The RE3Pd6Sb5 antimonides adopt an ordered defect structure that derives from the CaBe2Ge2 type. Their crystal chemistry is compared to the structures of Ce8Rh17Sb14 and Yb5Cu11Sn8 on the basis of group-subgroup schemes. Temperature-dependent magnetic susceptibility data of the samples with RE = Pr, Nd and Gd show Curie-Weiss paramagnetism of the trivalent rare earths. Low-field susceptibility measurements reveal magnetic ordering at low temperatures.
Syntheses and Crystal Structures of the Solid Solution Sr4OBr2.89(2)Cl3.11(2) and the Elusive Ba2OBr2
Authors: Reckeweg Olaf , DiSalvo Francis J.
Published: February 2015

Transparent and colorless single crystals of the compounds Sr4OBr2.89(2)Cl3.11(2) and Ba2OBr2 were obtained by solid-state reactions of SrCl2, SrBr2 and SrO (3 : 3 : 2 molar ratio) or by using an excess of BaO together with BaBr2 and Ba as a flux with the molar ratio 3 : 2 : 2, respectively. Ba2OBr2 crystals are isopointal to K2ZnO2 adopting the orthorhombic space group Ibam (no. 72, Z = 4) with the cell parameters a = 7247.44(10), b = 1297.76(20) and c = 657.43(10) pm. Sr4OBr2.89(2)Cl3.11(2) is isotypic to Ba4OCl6 (or isopointal to K6ZnO4) and crystallizes in the hexagonal space group P63mc (no. 186, Z = 2) with the cell parameters a = 982.20(4) and c = 750.41(7) pm.
A New Triterpenoid Alkaloid from Buxus sempervirens
Authors: Yan Yu-Xin , Sun Yun , Chen Jian-Chao , Su Jia , Li Yan , Qiu Ming-Hua
Published: February 2015

A new triterpenoid alkaloid, 16-deacetoxy-hyrcamine (1), together with six analogs, was isolated from the leaves and stems of Buxus sempervirens. Their structures were elucidated based on spectral methods and by comparison of the spectral data with those reported previously. All isolated compounds were evaluated for their growth inhibitory activity against human cell lines HL-60, SMMC-7721, A-549,MCF-7, and SW480. Compounds 1 - 4 and 6 showed modest cytotoxic activity against A-549, MCF-7, and SW480.
Calculation of 15N NMR Parameters of Azides and Some Related Compounds. Revisiting the Methylation of Nitrous Oxide N2O
Authors: Wrackmeyer Bernd
Published: February 2015

The results of a calculation of 15N NMR parameters (chemical shifts and coupling constants) of azides and related compounds are in reasonably good agreement with experimental data, even for triazadienyl fluoride, F-N3. The reaction between [CH3]+ and nitrous oxide, N2O, can yield either an O- or an N-methylated cation, [Me(N2O)]+. The calculated 15N NMR parameters clearly indicate that under the experimental conditions N-methylation to give [MeNNO]+ is preferred instead of the methoxydiazonium ion [MeONN]+ previously proposed.
Lanthan-Triel/Tetrel-ide La(Al,Ga)x(Si,Ge)1-x. Experimentelle und theoretische Studien zur Stabilität intermetallischer 1 : 1-Phasen / Lanthanum Triel/Tetrel-ides La(Al,Ga)x(Si,Ge)1−x. Experimental and Theoretical Studies on the Stability of Intermetallic 1:1 Phases
Authors: Dürr Ines , Bauer Britta , Röhr Caroline
Published: February 2015

Systematic studies of the phase formation at the binary sections LaSi - LaGa and LaGe - LaAl have been carried out by means of synthetic, crystallographic and bond theoretical methods. The hightemperature forms of the two binary monotetrelides LaSi and LaGe crystallize with the FeB structure type, whereas LaGa forms the related CrB type and LaAl the significantly different CeAl type. Starting from LaSi/LaGe, the FeB type (orthorhombic, space group Pnma, Z = 4, a = 839.2(1)/842.7(1), b = 399.9(1)/412.3(1), c = 606.2(2)/612.2(1) pm, R1 = 0.0356/0.0298) remains stable only down to a valence electron number per M atom (M = Si, Ge, Al, Ga) of 6.9 (LaGa0.10Si0.90: a = 840.14(7), b = 404.12(12), c = 608.5(2) pm, R1 = 0.0513; LaAl0.15Ge0.85: a = 845.40(7), b = 414.08(13), c = 614.08(14) pm, R1 = 0.0213). In the system LaGaxSi1−x, the stability range of the CrB type (orthorhombic, space group Cmcm, Z = 4) starts at a gallium proportion of 25% (LaGa0.25Si0.75: a = 450.03(8), b = 1140.5(2), c = 406.05(6) pm, R1 = 0.0163) and extends to the border compound LaGa (v. e./M = 6). The CrB type also occurs in the system La-Al-Ge, but is in this case only formed around the 1 : 1 composition in between LaAl0.42Ge0.58 (a = 455.90(12), b = 1161.1(3), c = 418.05(9) pm, R1 = 0.0474) and LaAl0.61Ge0.39 (a = 454.89(10), b = 1168.8(2), c = 420.41(11) pm, R1 = 0.0447). These stability ranges, the variations of several key geometric parameters such as the M-M distances or the heights of the trigonal prisms, and the main aspects of the chemical bonding in these lanthanum monometallides are analyzed using FP-LAPWband structure methods. The structure of the new compound La2Al2Ge (V2B3 structure type, orthorhombic, space group Cmcm, a = 416.69(4), b = 2719.7(4), c = 450.46(5) pm, Z = 2, R1 = 0.0458) combines the structural elements of the CrB/FeB structure family (two-bonded M atoms) with the trigonally planar bonded M atoms of the ThSi2 type in a fully ordered Al and Ge atom distribution and thus without phase width
Synthesis of Some 1,3-Dimethyl-6-substituted-1H-pyrazolo[3,4-b]pyrazin-5(4H)-ones
Authors: Safieh Kayed A. Abu , Al-Masri Feda’a S. , Ayoub Mikdad T. , El-Abadelah Mustafa M. , Voelter Wolfgang
Published: February 2015

A series of new 6-substituted-1,3-dimethyl-1H-pyrazolo[3,4-b]pyrazin-5(4H)-ones (13a - e) and 1,3-dimethyl-5a,6a,7,8-tetrahydro-1H-pyrazolo[4,3-e]pyrrolo[1,2-a]pyrazin-5(4H)-one (15) have been synthesized. The synthetic strategy involves direct interaction of D,L-α-amino acids with 5- chloro-1,3-dimethyl-4-nitro-1H-pyrazole (10) to produce the respective N-(1,3-dimethyl-4-nitro-1Hpyrazol- 5-yl) D,L-α-amino acids 11a - e and 14. The latter compounds underwent reductive lactamization to deliver the corresponding target heterocyclic systems 13a - e and 15
Reaction Prediction using Density Functional Theory Calculations: A Study into the Synthesis of Safranal via Diels-Alder Reactions
Authors: Wagner Gabriele , Vahdati Nadia , Howkins Ashley , Cubitt Louisa
Published: February 2015

Two pathways for the synthesis of safranal (2,6,6-trimethyl-cyclohexa-1,3-diene-1-carbaldehyde) via a Diels-Alder reaction are proposed and analyzed for their feasibility by Density Functional Theory (DFT) calculations on a B3LYP/6-31G* level of theory. Pathway A involving the reaction of 3-methyl-2-butenal with 4-methoxypenta-1,3-diene is predicted to produce the desired regioisomers, although with low stereoselectivity. Due to the high activation barrier (23 kcal mol−1), the reaction will require harsher conditions than the related known reaction of Z-2-butenal and 1-methoxy-1,3- butadiene with a calculated ΔEa of 17 kcal mol−1. Replacement of the methoxy group at the diene by OAc, OSiMe3 or pyrrolidinyl does not enhance the reactivity any further. Preliminary experiments confirm these results, although the reaction conditions need to be improved for the reaction to be of synthetic use. In the reaction of methoxyethene with 3-formyl-2,4-dimethylpenta-1,3-diene (pathway B), the homo- and hetero-Diels-Alder pathways were compared. The desired homo-Diels-Alder reaction is predicted to give the correct regioisomer in an exothermic reaction. However, the activation barrier is high (30 kcal mol−1) and the reaction unlikely to proceed. The hetero-Diels-Alder reaction requires less activation energy (23 kcal mol−1) and is expected to dominate, although the thermodynamic driving force is low. The preferred regioisomeric product is the 2-methoxy-3,4-dihydropyran, in agreement with related reactions studied experimentally
Intermetallic Cadmium Compounds M5T2Cd (M = Ca, Yb, Eu; T = Cu, Ag, Au) with Mo5B2Si-type Structure
Authors: Tappe Frank , Schwickert Christian , Eul Matthias , Pöttgen Rainer
Published: February 2015

The intermetallic compounds M5T2Cd (M = Ca, Yb, Eu; T = Cu, Ag, Au) and Yb5Cu2Zn were synthesized by melting the elements in sealed tantalum tubes followed by annealing at 923 K. All phases were characterized on the basis of powder and single-crystal X-ray diffraction data: Mo5B2Si type, I4/mcm, Z = 4, a = 828.7(1), c = 1528.1(3) pm, wR2 = 0.030, 440 F2 values, 16 variables for Eu5Cu2Cd, a = 788.2(1), c = 1459.3(5) pm, wR2 = 0.053, 378 F2 values, 16 variables for Yb5Cu2Cd, and a = 797.2(1), c = 1438.8(3) pm, wR2 = 0.036, 386 F2 values, 17 variables for Yb5Au2.19Cd0.81, which shows a small degree of Au / Cd mixing. The M5T2Cd structures are intergrowth variants of slightly distorted CuAl2- and U3Si2-related slabs. Striking coordination motifs (exemplary for Eu5Cu2Cd) are square antiprisms of the Eu atoms around Cd, Eu8 square prisms around Eu, and trigonal Eu6 prisms around Cu within the AlB2-related slab. Temperature-dependent magnetic susceptibility measurements showed Pauli paramagnetism for Yb5Cu2Zn, indicating purely divalent ytterbium. Eu5Au2Cd exhibits Curie-Weiss behavior above 100 K with an experimental magnetic moment of 8.14 μB per Eu atom and a Weiss constant of 56 K. Antiferromagnetic ordering of the EuII magnetic moments is evident at 36 K, and a metamagnetic transition is observed at 25 K and 13 kOe.
A Rare Two-dimensional Network Based on 2,2ʹ-Biimidazole Bridged Double [PW11O39Ni]5– Polyanions
Authors: Wei Lin-Heng , Wang Zi-Liang , Li Ming-Xue
Published: February 2015

A novel two-dimensional complex based on the mono-vacant Keggin anion [PW11O39]7−, [Ni(BIIM)3]3[{Ni(BIIM)2}2(PNiW11O39)2(BIIM)]・H2O (BIIM = 2,2ʹ-biimidazole), was hydrothermally synthesized and characterized by elemental and thermo-gravimetric analysis, IR and UV spectroscopy. Each [PW11O39]7− anion captures an Ni2+ ion forming a [PNiW11O39]5− polyanion, two of which are linked together by a BIIM ligand into a [(PNiW11O39)2(BIIM)]10− polyanion supporting two Ni(BIIM)2
2+ units through two terminal oxygen atoms and affording a complicated [{Ni(BIIM)2}2(PNiW11O39)2(BIIM)]6− heteropolyanion. Each of these units is further attached to four surrounding equivalent units by their own Ni(BIIM)2
2+ linkers into a two-dimensional brick wall-like network with (6,3) topology.
Synthesis, Crystal Chemistry and Magnetism of the Metal-rich Borides MxRh7–xB3 (M = Cr, Mn, Ni; x = 0.39–1) with Th7Fe3-type Structure
Authors: Misse Patrick R.N. , Dronskowski Richard , Fokwa Boniface P. T.
Published: February 2015

Powder samples and single crystals of the boride phases MxRh7−xB3 (M = Cr,Mn, Ni; x ≤ 1) have been synthesized from the elements using an arc-melting furnace under purified argon atmosphere in a water-cooled copper crucible. The new phases were characterized from single-crystal and powder X-ray diffraction, as well as semi-quantitative EDX measurements. The obtained phases crystallize in the hexagonal Th7Fe3 structure type (space group P63mc, no. 186, Z = 2). In all cases (M = Cr, Mn, Ni), M is found to preferentially mix with rhodium at only one (6c) of the three available rhodium positions. Pauli paramagnetism was observed in CrxRh7−xB3 (x < 1), whereas both Pauli and temperature-dependent paramagnetisms were found in NiRh6B3.
The New Oxometallates Cs4[FeO3], Cs4[ZnO3] and Cs3[BO3] with Trigonal-planar Anions – Decomposition Products of Alkali Metal Suboxometallates
Authors: Hoch Constantin
Published: February 2015

Three new cesium oxometallates with trigonal-planar [MO3]n− anions (M = Zn, Fe, B) were observed as products of reactions aimed at the formation of alkali metal suboxometallates A9MO4 (A = Rb, Cs; M = Al, Ga, In, Fe, Sc), or as decomposition products thereof. Cs4[FeO3], Cs4[ZnO3] and Cs3[BO3] crystallize with new structure types (Cs4[FeO3]: triclinic, space group P1̄

, a = 7.0652(1), b = 7.125(1), c = 9.939(2) Å, α = 80.74(2), β = 71.32(2), γ = 64.04(2)°, Z = 2, Cs4[FeO3]: monoclinic, space group P21/c, a = 7.146(4), b = 18.572(1), c = 7.050(4) Å, β = 115.47(4)◦, Z = 4, Cs3[BO3]: orthorhombic, space group Pnma, a = 10.967(1), b = 10.967(1), c = 10.353(1) Å). In all structures the trigonal-planar anions have no or low point symmetry, but deviate only marginally from ideal 6̄m2 symmetry. The new crystal structures can be derived from simple and highly symmetrical packings of spheres or from known binary structure types.
Salacetal, an Oleanane-type Triterpene from Salacia longipes var. camerunensis
Authors: Mba’ning Brice M. , Lenta Bruno N. , Ngouela Silvère , Noungoué Didérot T. , Tantangmo Ferdinand , Talontsi M. , Tsamo Etienne , Laatsch Hartmut
Published: February 2015

Phytochemical investigation of the roots of Salacia longipes var. camerunensis led to the isolation of a new triterpenoid, salacetal (1), together with the known compounds mangiferin, 2-hydroxy- 3-oxo-D:A-friedooleanan-29-oic acid, β -sitosterol, and stigmasterol. The structure of the new compound as well as those of the known compounds were established by means of spectroscopic methods and by comparison with reported data.
Cyclization of Unsaturated Alcohols. Mild and Efficient Selenocyclization of Pent-4-en-1-ol
Authors: Rvović Marina D. , Divac Vera M. , Radenković Ninko , Bugarčić Zorica M.
Published: February 2015

An innovative route for intramolecular cyclization of pent- 4-en-1-ol has been delineated through a ring closing reaction with phenylselenyl halides, in good yield. Several catalysts (triethylamine, quinoline, 2,2ʹ-bipyridine, pyridine, CoCl2 and SnCl2) enable fast, facile and efficient cyclization.
Characterization of the Polyphenolic Composition of Purple Loosestrife (Lythrum salicaria)
Authors: Rauha Jussi-Pekka , Wolfender Jean-Luc , Salminen Juha-Pekka , Pihlaja Kalevi , Hostettmann Kurt , Vuorela Heikki
Published: February 2015

Phenolic compounds of purple loosestrife (Lythrum salicaria L.) w ere analysed by the use of liquid chromatography - mass spectrometry (LC/MS) equipped with atmospheric pressure chemical ionisation (APCI) and electrospray ionisation (ESI). The presence of vitexin and orientin as well as their isomers, isovitexin and isoorientin, were confirmed using ion trap multiple stage LC/MS3 analysis. Several phenolic acids and tannins were also detected. Ellagitannins, vescalagin and pedunculagin, are reported from the plant for the first time.
Quinolizidine Alkaloid Profiles of Lupinus varius orientalis, L. albus albus, L. hartwegii, and L. densiflorus
Authors: El-Shazly Assem , Ateya Abdel-Monem M. , Wink Michael
Published: February 2015

Alkaloid profiles of two Lupinus species growing naturally in Egypt (L. albus albus [synonym L. term is], L. varius orientalis) in addition to two New World species (L. hartwegii, L. densiflorus) which were cultivated in Egypt were studied by capillary GLC and GLC-mass spectrometry with respect to quinolizidine alkaloids. Altogether 44 quinolizidine, bipiperidyl and proto-indole alkaloids were identified; 29 in L. albus, 13 in L. varius orientalis, 15 in L. hartwegii, 6 in L. densiflorus. Some of these alkaloids were identified for the first time in these plants. The alkaloidal patterns of various plant organs (leaves, flowers, stems, roots, pods and seeds) are documented. Screening for antimicrobial activity of these plant extracts demonstrated substantial activity against Candida albicans, A spergillus flavus and Bacillus subtilis.
Chemical Composition of Turmeric Oil -A Byproduct from Turmeric Oleoresin Industry and Its Inhibitory Activity against Different Fungi
Authors: Jayaprakasha Guddadarangavvanahally K. , Negi Pradeep S. , Anandharamakrishnan Chinnaswamy , Sakariah Kurian K.
Published: February 2015

Curcumin, the yellow coloring pigment of turmeric is produced industrially from turmeric oleoresin. The mother liquor after isolation of curcum in from oleoresin known as curcumin removed turmeric oleoresin (CRTO) was extracted three times with n-hexane at room temperature for 30 min to obtain turmeric oil. The turmeric oil was subjected to fractional distillation under vacuum to get two fractions. These fractions were tested for antifugal activity against A spergillu s flavus, A . parasiticus, Fusarium moniliform e and Penicillium digitatum by spore germination method. Fraction II was found to be m ore active. The chemical constituents of turmeric oil, fraction I and fraction II were determined by GC and identified by GCMS. Aromatic turmerone, turmerone and curlone were major compounds present in fraction II along with other oxygenated com pounds.
The Influence of Newly Synthesised Fenpropimorph Derivatives on Some Pathogen Yeasts
Authors: Breierová Emília , Šajbidor Ján , Lamačka Martin
Published: February 2015

The effect of minimum inhibitory concentrations (MICs) of six novel fenpropimorph deri­vatives on lipid and sterol composition of Candida albicans, Cryptococcus neoformans, Malassezia pachydermatis and Malassezia furfur was investigated. The MICs for the most effective derivatives were found in the range from 3.7 to 56.7 μм and were 2 -3 times lower compared to the commercial fungicide bifonazol. The more efficient fenpropimorph derivatives were the piperidine derivative for C. albicans and the allylamine derivative for Cr. neoformans, M. pachydermatis and M. furfur . The inhibitor in the growth medium reduced the unsaturation index of the total lipid content in M. furfur and C.
Screening of Biotransformation Products of Carvone Enantiomers by Headspace-SPME/GC-MS
Authors: Demirci Fatih , Kirimer Neşe , Demirc Betül , Noma Yoshiaki , Başera Kemal Hüsnü Can
Published: February 2015

In the course of our continuing work on transformation of monoterpenes by microorga­nisms, the biotransformation of (+)-and(-)-carvone was carried out. The metabolites formed during microbial transformations were screened using a simple, rapid and efficient technique: Headspace-solid phase microextraction the application of this technique are described.