bluuebunny/crossref_metadata_2025_split huggingface dataset:
Chemischer Transport intermetallischer Phasen IV: Das System Fe - Ge/Chemical Vapour Transport of Intermetallic Phases IV: The System Fe - Ge
Authors: Bosholm O. , Oppermann H. , Däbritz S. 
Published: August 2018

Abstract
Six phases exist in the binary system iron-germanium Fe3Ge, β, η, Fe6Ge5, FeGe and FeGe2. All phases could be prepared by chemical transport with iodine as transport agent in the temperature range between T1 (600 °C) and T2 (950 °C). Two phase diagrams have been known in the literature from specific experiments of chemical vapour transport. It is now possible to decide which phase diagram is the most valid description.
A Simple High-Yield Synthesis of Gallium(I) Tetrachlorogallate(III) and the Reaction of Digallium Tetrachloride Tetrahydrofuran Solvate with 1,2-Diols
Authors: Schmidt Eva S. , Schier Annette , Mitzel Norbert W. , Schmidbaur Hubert 
Published: August 2018

Abstract
Gallium(I) tetrachlorogallate(III) Ga[GaCU] was prepared in quantitative yield by thermal de­composition of dichlorogallane [HGaCl2]2, which is readily available from Et3SiH and [GaCl3]2. The reaction of catechol with solutions of this gallium(I) tetrachlorogallate(III) in tetrahydrofuran leads to the evolution of hydrogen gas and affords a dinuclear gallium(III) complex with penta-coordinate metal atoms chelated and bridged by mono-deprotonated catechol ligands. In the crystalline phase tetrahydrofuran molecules are hydrogen-bonded to the hydroxy groups: [Ga(1,2 -OC6H4OH)Cl2(C4H8O)]2. The reaction with pinacol also gives hydrogen and the analogous product [Ga(OCMe2CMe2OH)Cl2(C4H8O)]2. The structures of the two compounds have been determined by X-ray diffraction. A mechanism of the new reaction has been proposed which involves oxidative addition of the diol to the solvate (THF)Cl2Ga-GaCl2(THF) present in the tetrahydrofuran solution to give a gallium hydride intermediate.
Ethylboration of Stannyl-Substituted Sulfur Diimides
Authors: Herberhold Max , Gerstmann Silke , Wrackmeyer Bernd 
Published: August 2018

Abstract
Bis(sulfurdiimido)tin compounds of the type R2Sn[(NSN)tBu]2 [R = Me (2a), Et (2b)] re­ act with triethylborane Et3B by rearrangement and N-ethylation to give the novel aminoborane derivatives R2Sn[N(tBu)SN(Et)BEt2]2 (5a, b), in the same way as nBu3Sn(NSN)tBu (1) reacts with Et3B to give nBu3Sn[N(tBu)SN(Et)BEt2] (4). In contrast, 2c (R = tBu) and tris(sulfurdiimido)tin compounds RSn[(NSN)tBu]3 [R = Me (3a), nBu (3d)] react with Et3B mainly by Sn- and S-ethylation, accompanied by extensive decomposition. 1H, 11B , 13C, 15N and 119Sn NMR spectroscopy served for the structural assignment in solution.
Synthesis of Novel Tetracarboxylato Dirhenium(III) Compounds and Crystal Structure of [Re2(1-Adamantylcarboxylate)4Cl2] · 4 CHCl3
Authors: Shtemenko Alexander V. , Golichenko Alexander A. , Domasevitch Konstantin V. 
Published: August 2018

Abstract
The coordination compounds o f the general formula Re2 (L)4X2 (X = Cl, Br; L = 1 -adamantyl-carboxylate and 1 -adamantylacetate) have been prepared and characterized by means of UV-VIS spectroscopy (20000 cm-1 , δ → δ*). The crystal and molecular structure of Re2(AdCOO)4Cl2 · 4 CHCl3 solvate was determined by X-ray diffraction. The units Re2(AdCOO)4Cl2 adopt a centrosymmetric dinuclear array with each metal atom coordinated in a distorted octahedron comprising one rhenium and one chlorine atoms (Re-Cl 2.505(2) Å) and four carboxylate oxygen atoms in the equatorial plane. The rhenium-rhenium separation of 2.2300(5) Å corresponds to quadruple bond between the metal atoms. All R e-0 bonds have an almost uniform length (2.017(4) -2.032(4) Å) and do not differ essentially from the parameters reported for related compounds. The closest environment of the Re2(AdCOO)4Cl2 molecules in the crystal comprises weak Cl---HC hydrogen bonds with the chloroform molecules and significantly shortened van der Waals contacts Cl---Cl, 3.46 Å.
Synthesis of α-Tocopheryl Glycosides
Authors: Witkowski S. , Wałejko P. 
Published: August 2018

Abstract
An unusual course of d-α-tocopherol glucosylation by the Helferich method was observed. The product distribution very depended on acid catalyst and solvent used. The β-glucoside was accompanied by an unsaturated α-glucoside. Other unsaturated d-α-tocopheryl glucosides were obtained by reactions with acetylated glucal and 2-acetoxy glucal.
Synthesis of 3,4-Dihydro-2H-pyrans by Hetero-Diels-Alder Reactions of Functionalized α,β-Unsaturated Carbonyl Compounds with Styrenes
Authors: Bogdanowicz-Szwed Krystyna , Pałasz Aleksandra 
Published: August 2018

Abstract
Cycloadditions of 3-aryl-2-benzoyl-2-propenenitriles 1a,b to styrene (2a) and its methyl or methoxy-substituted derivatives 2b-d proceed regio- and diastereoselectively yielding cis and trans diastereoisomers of 2,4,6-triaryl-3,4-dihydro-2H-pyran-5-carbonitriles 3 and 4 in 59-72% yield. Cycloadducts cis-3 were the major products. Reaction of 5-(4-nitrobenzylidene)-1,3-dimethylbarbituric acid (5) with styrenes 2a-d afforded diastereoisomeric mixtures of 2H-pyrano[2,3-d]pyrimidine-2,4(3H)-diones cis-6 and trans-7 in 71 - 78% yield.
Notizen: Optical Outer-Sphere Charge Transfer and Photoreactivity of the Ion Pair Tetrabutylammonium Tetrabutylborate
Authors: Kunkely Horst , Vogler Arnd 
Published: August 2018

Abstract
The ion pair [N(n-butyl)4]+[B(n-butyl)4]- in CCl4 shows a BR4
- → NR4
+ outer-sphere charge transfer (OSCT) absorption at λ = 306 nm (sh, ε = 420 dm3 M-1 cm-1). OSCT excitation of the ion pair in CH2Cl2 (λirr > 275 nm) leads to a photo­ lysis with ∅ = 1.5 x 10-3 at λirr = 280 nm. Octane is formed as photoproduct.
Notizen: Cocrystallisation of Trimethylchlorostannane with a Distannoxane
Authors: Mitzel N orbert W. , Lustig Christian , Scharfe Sandra 
Published: August 2018

Abstract
Partial hydrolysis of a mixture of Me2SnCl2 and Me3SnCl affords an aggregate of the composition [Sn2Cl(O)(OSnMe3)(Me)4]2, which cocrystallises with two equivalents of Me3SnCl to form endless bands of {[Sn2Cl(O)(OSnMe3)(Me)4]2·2Me3SnCl}∞ linked through Sn ··· Cl intermolecular contacts.
Metallkomplexe mit biologisch wichtigen Liganden, CXLXXX [1]. Kationische Bis(α-Aminosäuremethylester)-N,O-Chelatkomplexe von Palladium(II) [Pd(NH2CHRCO2Me)2]2+(BF4–)2/ Metal Complexes of Biologically Important Ligands, CXLXXX [1]. Cationic Bis(α-Amino Acid Methylester)-N,O-Chelate Complexes of Palladium(II) [(Pd(NH2CHRCO2Me)2]2+(BF4–)2
Authors: Schapp Jan , Beck Wolfgang 
Published: August 2018

Abstract
Reactions of the palladium(II) complexes trans-Cl2Pd(L-NH2CHRCO2Me)2 with AgBF4 in dichloromethane give the cationic chelate complexes [Pd(L-NH2CHRCO2Me)2]2+(BF4-)2 (R =CHMe2, CMe3, CH2CHMe2, CH2Ph, CH2CO2Me) inwhich the α-amino acid methylesters function as bidendate ligands. The complexes 1 - 5 are highly sensitive towards water.
57Fe NMR Spectroscopy of Some Sila-[1]ferrocenophanes and a Phospha-[1]ferrocenophane
Authors: Wrackmeyer Bernd , Tok Oleg L. , Ayazi Anahid , Hertel Frank , Herberhold Max 
Published: August 2018

Abstract

57Fe NMR spectra (11.66 MHz) of the 1,1-diorganosila-[1]ferrocenophanes, [Fe(C5H4)2]- SiR1R2 (1) (R1 = R2 = Me) and (2) (R1 = Me, R2 = Ph), the 1-chloro-1-organosila-[1]ferrocenophanes [Fe(C5H4)2]Si(Cl)R1 3 (R1 =Me) and 4 (R1 = Ph), and of 1,1-dichlorosila-[1]ferrocenophane, [Fe(C5H4)2]SiCl2 5, were measured. All 57Fe resonance signals are shifted to lower frequencies with respect to ferrocene, the largest shift being observed for 5 (-147.7 ppm). The influence of chloro substituents at silicon in comparison to organo groups is much more pronounced in the ferrocenophanes than in non-cyclic 1-silyl- or 1,1-di(silyl)-ferrocene derivatives. In the case of -2,2,6,6-tetramethylpiperidin-1-yl-phospha-[1]ferrocenophane, [Fe(C5H4)2]P(tmp) 6, the 57Fe nucleus is deshielded (129.8 ppm) with respect to ferrocene, and the coupling constant 2J(57Fe,31P) = 3.4 Hz was measured for the first time.
Polymeric Double [Cu(NCS)] Chains in the Crystal Structure of [Cu2(Me2Ea)2(SCN)2]∞ (HMe2Ea = 2-Dimethylaminoethanol) (NewP olymorph) and the Dimeric Structure of its DMSO Adduct
Authors: Vinogradova Elena A. , Vassilyeva Olga Yu. , Kokozay Volodymyr N. , Skelton Brian W. 
Published: August 2018

Abstract
A new polymorph of the copper(II) thiocyanate complex with 2-dimethylaminoethanol, [Cu2(Me2Ea)2(NCS)2]∞ (HMe2Ea = 2-dimethylaminoethanol, HL) 1, was isolated in the attempted synthesis of a mixed-metal complex from zerovalent copper, cadmium oxide and ammonium thiocyanate in CH3CN solution of HL in air. [Cu2(Me2Ea)2(NCS)2(DMSO)2] 2 is a product of recrystallization of 1 from DMSO. X-ray analysis carried out on single crystals for both compounds revealed that 1 is a rare example of a 1D coordination polymer consisting of two chains in which the metallic centres are connected through single end-to-end NCS groups. The chains are inter-linked through alkoxo-bridges of L groups between the neighboring copper atoms. Complex 2 is a centrosymmetric dimer composed of two CuL(NCS)DMSO units linked by alkoxo-bridges of L groups.
Notizen: Synthesis and Characterization of Nadorite: PbSbO2Cl
Authors: Porter Yetta , Halasyamani P. Shiv 
Published: August 2018

Abstract
The first labortory synthesis and characterization of the mineral Nadorite, PbSbO2Cl, is reported. The material was synthesized by combining PbCl2, PbO and Sb2O3. Powder X-ray diffraction data on the polycrystalline product is consistent with the previously reported crystal structure on the mineral. Infrared and thermogravimetric data are also present.
Two Hydroxo Bridged Dinuclear Lanthanide Phen Complexes: [Ln2(phen)4(H2O)4(OH)2](phen)2(NO3)4 with Ln = Tm, Yb
Authors: Wei Dan-Yi , Zheng Yue-Qing , Lin Jian-Li 
Published: August 2018

Abstract
Two isostructural hydroxo bridged dinuclear lanthanide phen complexes of general composition [Ln2(phen)4(H2O)4(OH)2](phen)2(NO3)4 with Ln = Tm (1), Yb (2) were prepared by reactions of the corresponding lanthanide nitrate and phenanthroline monohydrate in CH3OH/H2O at pH = 5.5. They crystallize in the triclinic space group P1̄ (no. 2) with the cell dimensions: a = 11.233(1), b = 11.456(1), c = 14.011(2) Å , α = 93.91(1)°, β = 98.20(1)°, γ = 108.21(1)°, V = 1683.0(3)Å3, Z = 1 for 1 and a = 11.236(1), b = 11.480(2), c = 13.986(2)Å , α = 93.91(1)°, β = 98.17(1)°, γ = 108.33(1)°, V = 1682.9(3) Å3, Z = 1 for 2. The crystal structures are composed of the hydroxo bridged dinuclear [Ln2(phen)4(H2O)4(OH)4]4+ complex cations, hydrogen bonded NO3
- anions and π-π stacking (phen)2 dimers. The lanthanide atoms are each surrounded by two phen ligands, two H2O molecules and two μ-OH groups to complete a tetragonal antiprismatic LnN4O4 coordination. Via two common μ-OH groups, two neighboring tetragonal antiprisms are condensed to form a centrosymmetric dinuclear [Ln2(phen)4(H2O)4(OH)4]4+ complex cation. The complex cations and (phen)2 dimers are assembled via π-π stacking interactions and hydrogen bondings into 2D layers parallel to (101̄), between which the hydrogen bonded NO3
- anions are sandwiched. The Tm compound shows paramagnetic behavior with an experimental magnetic moment of 7.51 μB at room temperature. No magnetic ordering is evident down to 5 K. Over the temperature range 70 - 300 K, the Yb compound obeys the Curie-Weiss law with an experimental magnetic moment of 4.32 μB at room temperature and shows weak ferrimagnetic behavior at low temperature.
Synthesis and Electronic Spectra of (N-1-Naphthyl-ethylenediamine)- dichloroplatinum(II). Fluorescence of the Appended Naphthyl Substituent
Authors: Kunkely Horst , Vogler Arnd 
Published: August 2018

Abstract
Pt(naph-en)Cl2 with naph-en =N-(1-naphthyl)- ethylenediamine was synthesized and spectroscopically characterized. The complex shows a fluorescence at λmax = 405 nm, which originates from the appended naphthyl substituent present as an electronically isolated chromophore.
Quadratate Und Hydrogenquadratate Cyclischer Stickstoffbasen Mit Schicht-, Ketten- und Leiterstrukturen / Squarates and Hydrogensquarates of Cyclic Nitrogen Bases with Layer-, Chainand Ladder-Structures
Authors: Mattes Rainer , Ebbing Jörg , Grüss Annette , Köppe Jens , Majcher Krystyna 
Published: August 2018

Abstract
The synthesis and single crystal X-ray structures of four adducts of squaric acid with cyclic nitrogen bases are reported. Extensive hydrogen bonding, ionic interactions and (in one case) π-π-interactions lead to layered, and to two- and three-dimensional assemblies. [Pyrimidinium][ hydrogenquadratate] (1) has a layer structure, consisting of head-to-tail infinite chains of pyrimidinium and [HC4O4]− ions, which are cross-linked by short N-H···O and C-H···O hydrogen bonds. [C9H11N2][HC4O4] ・0.5H2C4O4 (2), the adduct of a benzodiazepin and squaric acid, has a ladder-structure. Chains of [HC4O4]− ions and H2C4O4 molecules in alternating order form the ladder-beam. Layers of cations and anions in the ratio 2:1 build the crosspieces at an angle of 49° to the beam. The layers contain dimers of [HC4O4]− ions. [H2L2][HC4O4]2 (3) with L2 = 5,6,7,8,9,14,15,16,17,18-decahydrodibenzo[e,l]-1,4,8,11-tetraaza-cyclotetradecine shows zigzag chains made of [HC4O4]− ions. Between the [H2L2]2+ and the [HC4O4]− ions π-π interactions exist besides up to four N-H···O hydrogen bonds. The [H2L2]2+ ions possess two different conformations. [H2cyclam][C2O4] ·4H2O (4) contains strongly undulated layers of the composition [C4O4 ·4H2O]2−. The cations, which show two intramolecular N-H···N hydrogen bonds with N···N distances of 2.870 (3) Å , are interlinked at an angle of 41.5°.
The Reduction of Pyridine to 1,4-Dihydropyridine by Lithiumtetrahydroborate in the Presence of Water
Authors: Nöth Heinrich , Warchhold Marcus 
Published: August 2018

Abstract
In the presence of water lithium tetrahydroborate is capable of reducing pyridine to 1,4- dihydropyridine. The product, lithiumtetrakis(pyridine) tetrakis(1,4-hydropyridyl)borate, was isolated and characterized by NMR and IR spectroscopy and single crystal X-ray diffraction. [Li(py)4][B(pyH)4].2(1,4-dioxane) crystallized in space group P42/n, Z = 2. Similarly, NaBH4 can also reduce pyridine in the presence of water and equivalent amounts of LiCl or ZnCl2.
Conductivity, Electrodeposition and Magnetic Property of Cobalt(II) and Dysprosium Chloride in Zinc Chloride-1-Ethyl-3-Methylimidazolium Chloride Room Temperature Molten Salt
Authors: Hsu Hsin-Yi , Yang Chao-Chen 
Published: August 2018

Abstract
Electric conductivity of the molten zinc chloride-1-ethyl-3-methylimidazolium chloride phases has been measured by a computerized system using the d.c. four-probes method. The sequence of the conductivities for the different component melts is ZnCl2-EMIC > ZnCl2-EMIC-CoCl2 > ZnCl2- EMIC-DyCl3 > ZnCl2-EMIC-CoCl2-DyCl3. The results may be explained in terms of the viscosity increase due to the complex formation.
The electrochemistry and the nucleation mechanism of cobalt(II) or/and dysprosium chloride in acidic ZnCl2-EMIC melts have been investigated by cyclic voltammetry and chronoamperometry at different temperatures, respectively. The results of the SEM and VSM analyses reveal that reduction of Dy3+ to Dy2+ may have occurred, while reduction of Dy3+ to Dy(0) is conjectured to play no role. Moreover, the results of chronoamperometry experiments show that nucleation in the alloy electrodeposition is instantaneous, and that, as the applied deposition potential becomes more negative, the nucleation density increases, which rapidly shortens the time required for the diffusion zones to overlap.
Electrodeposition of a Dy-Co-Zn alloy on a Ni or Cu sheet from the 50-50 mol% ZnCl2-EMIC melt containing 1.687 mol% CoCl2 and 1.114 mol% DyCl3 has been accomplished, and the morphology and the composition have been analyzed by SEM and EDS, respectively. The magnetism of the deposited layer is discussed based on the results of the VSM analysis.
Rietveld Refinement of the Crystal Structure of α-Be3N2 and the Experimental Determination of Optical Band Gaps for Mg3N2, Ca3N2 and CaMg2N2
Authors: Reckeweg Olaf , Lind Cora , Simon Arndt , DiSalvo Francis J. 
Published: August 2018

Abstract
α-Be3N2 powder was obtained by reacting Be metal with dry, flowing N2 at 1600 K. The product contained 5.9(7) wt.% of BeO. The anti-bixbyite structure suggested earlier was verified through Rietveld refinement on the basis of X-ray powder data (Ia3 (#206); a = 814.518(6) pm). The optical band gaps of α-Be3N2, Mg3N2 and Ca3N2 are compared with newly measured values for Mg3N2, Ca3N2 and CaMg2N2.
Secondary Bonding Interactionsi in Some Di- and Trihaloanilinium Halides
Authors: López-Duplá Esperanza , Jones Peter G. , Vancea Fabiola 
Published: August 2018

Abstract
Six solvent-free structures of di- and trihaloanilinium halides are presented. All involve clearly defined hydrophilic regions built up from classical hydrogen bonding systems. The 2,4-dibromo-, 2,6- dichloro-, 2,4,6-trichloro- and 2,4,6-tribromoanilinium derivatives form ribbon structures involving annelated R2
4 (8) rings with NH2 donors (two hydrogens from the positively charged NH3 groups) and halide acceptors. The 2,5-dibromo- and 2,4,5-trichloro derivatives form layers with two types of ring, R2
4 (8) and R4
8 (16). All structures also involve other secondary interactions (C-H. . . X hydrogen bonds and/or X. . . X contacts, X = halogen), some of which link the ribbons or layers into a second or third dimension. The shortest X. . . X contacts generally involve the anions. In the 2,4-dibromo, 2,4,6-trichloro and tribromo derivatives, somewhat more extensive halogen aggregates (triangles, angled X3 or X4 chains) are formed between neutral halogens. In two appendices, the packing patterns of (I) the disordered structure 3,4,5-trichloroanilinium chloride and (II) the known structures of unsubstituted anilinium halides are briefly presented.
Zu den pseudobinären Zustandssystemen Bi2Ch3-BiX3 und den ternären Phasen auf diesen Schnitten (Ch = S, Se, Te; X = Cl, Br, I), I: Bismutsulfidhalogenide/The Pseudobinary Systems Bi2Ch3-BiX3 and the Ternary Phases on their Boundary Lines (Ch = S, Se, Te; X = Cl, Br, I), I: Bismuth Sulfide Halides
Authors: Oppermann Heinrich , Petasch Uwe 
Published: August 2018

The phase diagrams of the systems Bi2S3-BiX3 were constructed from results of DTA and total pressure measurements and x-ray analysis. The phases: BiSCl, Bi4S5Cl2 and Bi19S27Cl3 for X = Cl; BiSBr and Bi19S27Br3 for X = Br; BiSI and Bi19S27I3 for X = I exist on the boundary lines. The enthalpies of formation and standard entropies of the phases follow from the coexistence decomposition pressure functions. The data are:
ΔH°B(BiSClf,298) =−49,6 ± 1,6 kcal/mol S°(BiSClf,298) = 30,3 ± 2,5 cal/K·mol
ΔH°B(Bi4S5Cl2,f,298) =−144,4 ± 3 kcal/mol S°(Bi4S5Cl2,f,298) = 114,0 ± 4,6 cal/K·mol
ΔH°B(Bi19S27Cl3,f,298) = −520 ± 10 kcal/mol S°(Bi19S27Cl3,f,298) = 490 ± 10 cal/K·mol
ΔH°B(BiSBrf,298) = −40,2 ± 1,4 kcal/mol S°(BiSBrf,298) = 32,0 ± 3 cal/K·mol
ΔH°B(Bi19S27Br3,f,298) = −493,6 ± 6,7 kcal/mol S°(Bi19S27Br3,f,298) = 499,8 ± 17 cal/K·mol
ΔH°B(BiSIf,298) =−27,8 ± 1,4 kcal/mol S°(BiSIf,298) = 36,1 ± 2,5 cal/K·mol
ΔH°B(Bi19S27I3,f,298) =−464,4 ± 15 kcal/mol S°(Bi19S27I3,f,298) = 502,7 ± 15 cal/K·mol
Transfer of the Fluorous Biphasic Concept to the Palladium-Catalyzed Addition Polymerization of Norbornene
Authors: Lassahn Paul-Gerhard , Tzschucke Christoph , Bannwarth Willi , Janiaka Christoph 
Published: August 2018

Abstract
Two perfluorinated palladium(II) pre-catalysts of the type (ArF
3P)2PdCl2 (ArF = m-C8F17-C2H4- C6H4 - and p-C7F15-CH2-O-C6H4-) could be highly activated with the co-catalyst B(C6F5)3/AlEt3 or methylalumoxane (MAO) for the vinyl/addition polymerization of norbornene. Their recycling was studied by using the FBS concept (Fluorous Biphasic System).
Zur Kenntnis rhomboedrischer Perowskite (La,Sr)(Mn,Fe)O3/Contributions to the Chemistry of Rhombohedral Perovskites (La,Sr)(Mn,Fe)O3
Authors: Börger Alexander , Langbein Hubert 
Published: August 2018

Abstract
Perovskites La1−xSrxMn1−xFexO3+δ (x = 0.1 - 0.5) were prepared by a freeze-drying method and for comparison by conventional solid state reaction. Freeze-dried precursors are more reactive, forming the final perovskites at lower temperatures and within shorter reaction times. Under the reaction conditions employed (air atmosphere, 800 - 1350 °C), the perovskite La0.9Sr0.1Mn0.9Fe0.1O3 was obtained in an orthorhombic modification. By annealing under oxygen at 800 °C, however, a rhombohedral modification La0.9Sr0.1Mn0.9Fe0.1O3.1 with an excess oxygen content can be prepared. The structures of the other perovskites of the series (x = 0.2 - 0.5) were refiṉed on the assumption of a rhombohedral distortion of the ideal perovskite structure (space group R3c). There are characteristic correlations between composition of samples, volume and distortion of the AO12- and BO6-polyhedra in the ABO3 structure.
Amine and Imine Nitrogen Atoms of a New Schiff Base Type Ligand Simultaneously Coordinated to a Dinuclear Mn2O2 Core
Authors: Seoka Won K. , Karaghiosoff Konstantin , Klapötkeb Thomas M. , Mayer Peter 
Published: August 2018

Abstract
The dinuclear Mn(IV) complex [Mn(C-X-salpn)(μ-O)]2·Me2CO (H2salpn=N,N’-bis(salicylidene)- 1,3-diaminopropane and X = CH2C(=O)CH3) crystallizes in the monoclinic space group C2/c with a = 27.388(6), b = 10.388(2), c = 19.797(4) Å , β = 133.11(3)°, V = 4111(1) Å3 and Z = 4. It contains a new Schiff base type ligand, which is related to salpn by the addition of acetone to one of the two C=N moieties. Main feature of the centrosymmetric structure is a planar Mn2O2 four-membered ring. The coordination environment of the manganese atoms is roughly octahedral comprising two phenolic oxygen atoms as well as two amine and two imine nitrogen atoms of the ligand. The Mn···Mn distance is 2.740(8) Å and the Mn-O-Mn bridging angle amounts to 97.2(1)°.
A New Tetranortriterpenoid from Dysoxylum lenticellatum
Authors: Qi Shu-Hua , Wub Da-Gang , Zhang Si , Luo Xiao-Dong 
Published: August 2018

Abstract
A new tetranortriterpenoid, named lenticellatumin (1), three known terpenoids, dysoxylumin C (2), eichlerianic acid (3) and dysoxylumin F (4), together with three ceramides, 1-O-β -D-glucopyranosyl-( 2S,3S,4R,8Z)-2-N-(2’-hydroxytetracosanoyl) octadecasphinga-8-ene (5), (2S,3S,4R,8E)-2- N-(2’-hydroxytetracosanoyl) octadecasphinga-8-ene (6), (2S,3R,4E)-2-N-(2’-hydroxytetracosanoyl) octadecasphinga-4-ene (7), were isolated from the twig of Dysoxylum lenticellatum. Their structures were determined from spectroscopic analysis. Activity screening showed that compound 5 exhibited strong antifeedant activity against pieris brassicae L., while 6, 7 displayed weak activities.