bluuebunny/crossref_metadata_2025_split huggingface dataset:
Zur Kenntnis des Bariumthioantimonats(III) Ba8Sb6S17 / On Bariumthioantimonate(III) Ba8Sb6S17
Authors: Dörrscheidt Wolfgang , Schäfer Herbert 
Published: February 2015

Abstract
Bariumthioantimonate(III), Crystal Structure Ba8Sb6S17, prepared by fusion of the binary sulfides at 1120 K, crystallizes in the mono-clinic system (space group:P2/c) with a= 1141 ± 1 pm, b = 1373 ± 1 pm, c = 2253 ± 2 pm, β = 90.94 ± 0.05°. In the structure there are isolated distorted SbS3
3- -trigonal pyramids (ψ-tetrahedra) and hitherto unknown Sb3S8
7--units consisting of a central SbS4-ψ-trigonal bipyramid connected by the common axial S-atoms with two further SbS3
3- groups.
Reactions of Biscyclopentadienyl Vanadium with NO and XNO (X = Cl OR Br)
Authors: Morán M. , Gayoso M. 
Published: February 2015

Abstract
The reactions of (η-C5H5)2V with NO and XNO (X = CL or Br) lead to the formation of [η-C5H5V(NO)2]2 and (η-C5H5)2VX(NO) (X = CL or Br) respectively. The compounds have been characterized by elemental analysis, magnetic moments and IR and EPR spectra.
Two-Dimensional (2D-J) NMR Spectroscopy for Analysis of Isomers and Heterocouplings
Authors: Benn Reinhard , Riemer Werner 
Published: February 2015

Abstract
The use of two-dimensional NMR spectroscopy (2D-J) for the identification of isomers and heterocouplings is demonstrated. The routine application of this new method to practical NMR problems is discussed.
The Fluctional Behaviour of the P7 Trianion -A Molecular Orbital Study
Authors: Böhm Michael C. , Gleiter Rolf 
Published: February 2015

Abstract
The degenerate rearrangement of P7
3- has been studied by means of the MINDO/3 method. The calculated enthalpy of activation (⊿H≠ = 59.12 kJ/mol) is in good agreement with results from 31P NMR studies at different temperatures. The bond switching process starts with a bond rupture leading to a transition state with C2v symmetry. Possible rearrangements in P6S2-and P6CH2-are discussed.
New Phospha(III)azenes / New Phospha(III)azenes
Authors: Scherer Otto J. , Conrad Herbert 
Published: February 2015

Abstract
The interaction of RR'N-PCl2 (1) with LiNR"SiMe3 gives monomeric phospha(IH)-azenes RR'N-P=N-R"; R = R"=i-C3H7, R'= (CH3)3C (3a); R=i-C3H7,R'=R" = (CH3)3C (3b); R = i-C3H7, R' = (CH3)3C, R"=(CH3)3Si (3c) as distillable liquids. 3a adds PCl3 with formation of RR'N-PCl-NR-PCl2, R = i-C3H7, R'=(CH3)3C (6).
Tl4Ge4Se10, ein Thallium(1)selenogermanat mit adamantananalogem Anion [Ge4Se10]4- / Tl4Ge4Se10, a Thallium(I) Selenogermanate with the Adamantane-Like Anion [Ge4Se10]4-
Authors: Eulenberger Günther 
Published: February 2015

Abstract
Tl4Ge4Se10 crystallizes in space group C2/c with a = 15.602(6), b = 15.549(5), c = 9.052(3) Å, β - 107.10(3)° and Z = 4. The compound was prepared by fusion of a stoichiometric mixture of Tl2Se and GeSe2. The crystal structure is characterized by adamantane-like anions [Ge4Se10]4- and Tl+ cations. Tl4Ge4Se10 is iso-structural with Tl4Ge4S10 [1].
Die Stabilisierung von Tris(hydrazino)phosphan durch Komplexbildung / The Stabilisation of Tris(hydrazino)phosphane by Complex Formation
Authors: Nöth Heinrich , Thorn Volker 
Published: February 2015

Abstract
The solvolysis of (CO)5CrPCl3 with N2H4 or H2N-N(CH3)2 yields (CO)5CrP(NH-NH2)3 and (CO)5CrP[NH-N(CH3)2]3 respectively containing the hitherto unknown and unstable ligands P(NH-NH2)3 and P[NH-N(CH3)2]3. Their constitution is derived from spectroscopic data.
Nitrido-azido-Komplexe des Molybdäns(VI) Synthese und Kristallstruktur von MoN(N3)3(NC5H5) / Nitrido Azido Complexes of Molybdenum (VI) Synthesis and Crystal Structure of MoN(N3)3(NC5H5)
Authors: Schweda Eberhard , Strähle Joachim 
Published: February 2015

Abstract
The explosive nitrido azido complexes MoN(N3)Cl2 · py and MoN(N3)3py are prepared by the reaction of MoCl4(py)2 with (CH3)3SiN3 in 1,2-dichloroethane. Both compounds hydrolyze quickly in moist air. After separation of the insoluble, black MoN(N3)Cl2 · py from the solution of MoN(N3)3py, the latter can be obtained in form of monoclinic, red crystals of the space group C2/c. Its structure consists of monomeric complexes, wherein the Mo atom has a square pyramidal coordination. The nitrido ligand occupies the apex and forms a strong multiple bond of 163.4 pm to the Mo atom. σ-Bonds of different strength exist between the Mo atom and the basal ligands: MO-N3 - 204.3 pm; Mo-py = 225.8 pm. The α-N atoms of the azido groups are sp2 hybridized, with their lone pair pointing away from the nitrido ligand. The pyridine ligand forms an angle of 61.6° to the basal plane of the coordination polyhedron.
Die Autoxidation von metallischem Kupfer und Kupfer(I)-Verbindungen / Investigation on Autoxidation of Metallic Copper and Copper(I) Compounds by Different Methods
Authors: Horner Leopold , Pliefke Engelbert 
Published: February 2015

Abstract
The corrosion of copper granules under controlled conditions (2.5% NaCl solution, pH 4 buffer, O2) was studied using a) the rate of uptake of oxigen and b) the pH stat method. Cu2+ ions catalyse the corrosion of copper. The surface area of the copper and the temperature influence the rate of corrosion in the expected manner. Experiments in light and dark showed little variation in the results.
The results obtained by measuring the O2 uptake and using the pH stat method were confirmed and complemented by electrochemical measurements. (Steady potential/time curves, current/voltage curves, measurement of the polarisation resistance and estimation of Cu2+ during corrosion via a Cu2+ sensitive electrode.) The influence on the corrosion of F-, CI-, Br- and I-, mineral acid concentration and other inorganic ions was also studied under standard conditions. To ensure the correctness of the interpretation of the results (see reaction scheme), the autoxidation of CuCl and CU2O was also studied under standard conditions.
The experimental results are consistent with the steps (1)-(4) in the reaction scheme. The fastest step is clearly the oxidation of Cu1+ , which is continuously supplied via the copper surface. The interpretation here presented forms the basis for the understanding of the inhibition of corrosion exhibited by a number of organic compounds.
Crystal Structure and the Radiation-Induced Free-Radical Chain Reaction of 2-Deoxy-β-D-erythro-pentopyranose in the Solid State
Authors: Schuchmann Man Nien , Sonntag Clemens von , Tsay Yi-Hung , Krüger Carl 
Published: February 2015

Abstract
The crystal structure of 2-deoxy-β-D-enrythro-pentopyranose (1) was reexamined by X-ray crystallographic studies. In crystalline 1, a radiation-induced chain reaction occurs with the only product being, 2,5-dideoxy-D-enrythro-pentonic acid (4). In the chain propagating step leading to 4, an H atom is transferred over a distance of ≤ 3.3 Å as taken from interatomic distances in the unperturbed crystal. The crystal structure clearly indicates the direction by which the chain reaction proceeds through the crystal. The strong temperature dependence of G(4) is discussed in terms of temperature effects on chain initiation, propagation and termination rates.
Benzoylierung an 3-8ubstituierten 4-Hydroxy-2-chinolonen und 4-Hydroxycumarinen / Benzoylation of 3-Substituted 4-Hydroxy-2-quinolones and 4-Hydroxycoumarines
Authors: Stadlbauer Wolfgang , Kappe Thomas 
Published: February 2015

Abstract
The reaction of 3-aryl- or alkylsubstituted 4-hydroxy-2-quinolones or 4-hydroxycoumarins (3a-k) with benzoylchloride afforded the 4-benzoyloxy-2-quinolones or 4- benzoyloxycoumarines 2a-k. Only in one case the 3,3-disubstituted quinolinedione 4 has been isolated, which rearranges to 2a under thermal or basic conditions.
Pseudobasen aus Chinolinium-Salz und Alkoxiden / Pseudobases from Quinolinium-Salts and Aleoxides
Authors: Gündel Wolf-H. , Berenbold Helmut 
Published: February 2015

Abstract
The quaternary 3-cyano-quinolinium salt (1b) reacts in aqueous buffer solution (pH 7.5-12) to oxy-di(1.4-dihydroquinoline) (7), which gives on addition of alcohols or oximes in high yields the alcoxy-dihydroquinolines (8a-c) or dihydroquinolyl-oximethers (8d-f).
Silyl-Assistierte Etherspaltung bei Radikalkationen von Hydroxylaminderivaten [1] / Silyl-Assisted Ether Cleavage in Radical Cations of Hydroxylamine Derivatives [1]
Authors: Ciommer Bernhard , Schwarz Helmut , Maaroufi Azzedine , Reetz Manfred T. , Levsen Karsten 
Published: February 2015

Abstract
It is demonstrad by means of various mass spectrometric techniques that the dissociative ionization of N.N-bis-silylated hydroxylamine derivatives (5a) and (5b), giving rise to the cleavage of the (O-C) bond, is anchimerically assisted by migration of the trimethylsilyl group to the ether oxygen, thus generating ion (7).
Preparation and Some Reactions of Phenylmercury Thio- and Dithiocarboxylates
Authors: Kato Shinzi , Hattori Eiji , Sato Hiroyuki , Mizuta Masateru , Ishida Masaru 
Published: February 2015

Abstract
It has been found that the reaction of diphenylmercury with an equimolar amount of thio- or dithio acids gave the corresponding phenylmercury thio- (1) or dithiocarboxylates (2), quantitatively, which further react with thio- or dithio acids to give mercury bis (thio-) (3) or bis(dithiocarboxylates) (4). The phenylmercury dithio salts (2) were found to be the very useful thioacylating agents for primary and secondary amines. The reaction of mercury bis(thiocarboxylates) (3) with dithiocarboxylic acids gave the unsymmetrical thio- and dithiocarboxylic acid mercury salts [RC(O)SHgS(S)CR′]j (5) in good yields.
Darstellung und Spektroskopische Charakterisierung von [4.7-13C2]-Azulen/ Preparation and Spectroscopic Characterisation of [4,7-13C2] Azulene
Authors: Zeller Klaus-Peter , Berger Stefan 
Published: February 2015

Abstract
A multistep synthesis of [4.7-13C2] azulene (10) using Na13CN as source for the labelled carbon atom is described. The electron impact induced elimination of acetylene from the molecular ions of 10 proceeds with almost statistical participation of the carbon atoms, thus indicating an extensive scrambling of the azulene carbon skeleton prior to fragmentation. From the 13C NMR spectrum of 10, 13C13C spin spin coupling constants have been determined. The measured values confirm our earlier interpretation of the transmission of the 13C13C spin spin coupling constants in terms of a π-mechanism.
Isolation of the Geminal Bis(amido) Derivative, N4P4(NH2)2Cl6, from the Reaction of N4P4Cl8 with Ammonia
Authors: Ramabrahmam P. , Krishnamurthy S. S. , Woods M. 
Published: February 2015

Abstract
Geminal Bis (amido)hexachlorocyclotetra -phosphazene, Aqueous Ammonia Synthesis, 31P NMR The geminal isomer of N4P4(NH2)2Cl6 is obtained from the reaction of the octachloride, N4P4Cl8, with aqueous ammonia in diethyl ether in the presence of anhydrous sodium sulphate. The compound is characterised by 31P NMR spectroscopy and by conversion to its dimethyl -amino derivative, N4P4(NH2)2(NMe2)6.
Dialkylallenylidenekomplexe mit Pentacarbonylfragmenten der VIb Metalle/Dialkylallenylidene Complexes with Pentacarbonyl Fragments of VI b Metals
Authors: Berke Heinz , Härter Peter , Huttner Gottfried , Zsolnai Laszlo 
Published: February 2015

Abstract
In the context of the synthesis of allenylidene compounds, the reaction of methylpropiolate with a (OC)5CrO(C2H5)2 complex was investigated. The species pentacarbonyl- (methylpropiolate)chromium(0) (1), 2,4-bis(methoxycarbonyl)-cyclobut-2-en-1-yliden-1- pentacarbonylchromium(0) (2) and cis-2,4-dimethoxycarbonyl-1,3-butadien-1 -yliden-1 - pentacarbonylchromium (3) were isolated. Attempts to synthesize allenylidene complexes from 1 were unsuccessful. Di-iso-propyl or di-tert-butylallenylidene complexes with chromium or tungsten centers (4a, 4b, 5a, 5b) were finally obtained by the photochemical reaction of pentacarbonylpropargylates, (OC)5MC(O)C ≡ CCR2O2-, M = Cr, W, and subsequent desoxygenation. The complexes 4 a, b were characterized as triphenylphosphane adducts, di-iso-propylallenylidenetriphenylphosphorane complexes (6a und 6b). The structure of 6 a was determined by X-ray methods.
Darstellung und Charakterisierung von Triphenylbleiderivaten einiger Aminosäuren/Preparation and Characterization of Triphenyllead Derivatives of Some Amino Acids
Authors: Roge Gerd , Huber Friedo 
Published: February 2015

Abstract
Triphenyllead derivatives Ph3PbL (HL = glycine, alanine, phenylalanine) and (Ph3Pb)2L′ (H2L′ = aspartic acid) have been prepared from Ph3PbOH and the appropriate amino acid. PH3Pb-leucinate has been synthesized from Ph3PbCl and Tl(I)-leucinate. From IR data structural proposals are inferred: Ph3Pb-glycinate is polymeric through monodentate carboxylate and coordinating NH2; Ph3Pb-alaninate, -phenylalaninate, and -leucinate contain bidentate carboxylate and non-coordinating NH2 groups and are probably monomeric. For (Ph3Pb)2-aspartate and (Me3Sn)2-aspartate a structure with coordinating NH2 and mono-and bidentate carboxylate groups is proposed.
The Crystal and Molecular Structure of the 1:2 5,10-Dihydro-5,10-diethylphenazine-(E2P)-2,2′-(2,5-Cyclohexadiene-1,4- diylidene)bispropanedinitrile (TCNQ) Complex
Authors: Dietz K. , Endres H. , Keller H. J . , Moroni W. 
Published: February 2015

Abstract
C16H18N2·2 C12H4N4, C40H26N10, Mr = 646.7, crystallizes in space group P1̄ with a = 6.843(2), 6 = 7.845(3), c = 16.208(7) Å, α = 84.59(3), β = 81.63(3), γ = 75.75(3)°, V = 832.9 Å3 , Z = 1, dc = 1.29 Mgm-3 . Final weighted R = 0.107 based on 2894 reflections. The structure consists of stacks of TCNQ π-dimers with interplanar distances of 3.25(1) Å within a dimer and 3.54(1) A between dimers. The phenazine species do not form stacks and show no electronic interaction with adjacent E2P or TCNQ molecules.
The Structure of the Cyclopentathiazenium Cation (S5N5
+) - a MNDO Investigation
Authors: Gleiter Rolf , Bartetzko Richard 
Published: February 2015

Abstract
The total energies, heats of formation (⊿Hf), bond lengths and bond angles of four isomers of S5N5
+ (1) have been calculated using the MNDO method. The heart shaped and azulene like structures 1 e and 1 f have been found to be the most stable isomers with about equal energies.
cis -Bis(2 -methoxyphenyl)bis (triphenylphosphan)platin(II) Synthese, Kristall- und Molekülstruktur und thermisches Verhalten/cis-Bis(2-methoxyphenyl)bis(triphenylphosphane)platinum(II) Synthesis, Crystal and Molecular Structure and Thermal Stability
Authors: Debaerdemaeker Tony , Klein Heinz-Peter , Wiege Manfred , Brune Hans Albert 
Published: February 2015

Abstract
cis-Bis(2-methoxyphenyl)bis(triphenylphosphane)platinum(II) has been synthesized and its molecular and crystal structure determined by X-ray analysis. The structure is discussed with respect to the transition state of the thermal reductive elimination of 2,2′ -bismethoxybiphenyl.
Identification of Protected Deoxyribonucleotides by Field Desorption Mass Spectrometry in Fractions from High Performance Liquid Chromatography
Authors: Schiebel Hans Martin , Schulten Hans-Rolf 
Published: February 2015

Abstract
Protected deoxyribonucleotides were identified by field desorption mass spectrometry in eluate fractions from high performance liquid chromatography. The production of abundant cationized molecules and the formation of structural significant fragments by thermally/field induced processes allowed a direct and unambiguous identification of the synthesized products. In addition, indications can be obtained on both organic and inorganic impurities.
Das dynamische Verhalten des 1-Methyl-1-benzothiepinium-Ringsystems/The Dynamic Behaviour of the 1-Methyl-1-benzothiepinium Ring System
Authors: Hofmann Hans , Dickert Franz 
Published: February 2015

Abstract
By 1H NMR spectroscopy the stereochemistry of the 1-methyl-1-benzothiepinium ring system was investigated both in thermodynamic and kinetic respects. It was shown that in solution a rapid mutual conversion of the boat shaped seven membered ring system with exo-respectively endo-S-methyl group occurs via a ring inversion and not by a pyramidal inversion at the sulfonium ion. At room temperature predominantly the conformation with the exo-S-methyl group is present.
Conformational Studies of R-(+)-2-Alkylidene-and R-(—)-2-Benzylidene-5-methylcyclohexanones
Authors: Anand Devinder K. , Hargreaves Michael K. , Khan Mohsin A. 
Published: February 2015

Abstract
The cis and trans 2-alkylidene-5-methylcyclohexanones have been separated and distinguished. 2-Benzylidene-5-methylcyclohexanone was also prepared in both forms. The CD, ORD, UV and IR spectra are recorded and discussed. The NMR data include solvent and temperature effects.
Konfigurations-Bestimmung von Isomeren des Methyl 4-O-Acetyl-2.3-O-(1-phenylethyliden)-α-L-rhamnopyranosides/ The Configuration of Isomeres of Methyl 4-O-Acetyl-2,3-O-(1-phenylethylidene)-α-L-rhamnopyranoside
Authors: Lotter Hermann , Lipták András 
Published: February 2015

Abstract
The diastereomeric 2,3-O-[2-phenyl-2-methyl-1,3 dioxalanes] of methyl-α-L-rhamno-pyranosides were synthesised for the first time. The stereochemical characterisation was carried out by X-ray analysis. Evaluation of the X-ray data and comparison with NMR data indicated that the same configuration exists in the crystalline state as in solution.
Darstellung von 2-Amino-1.3.2λ3(λ5)-dioxaphospholanen / Synthesis of 2-Amino-1,3,2λ3 (λ5)-dioxaphospholanes
Authors: Storzer Werner , Schomburg Dietmar , Röschenthaler Gerd-Volker 
Published: February 2015

Abstract
The 2-amino-4,4,5,5-tetrakis(trifluoromethyl)-1,3,2λ3-dioxaphospholanes 1 a - c are synthesized by reacting halogenoaminophosphines with dilithiumperfluoropinacolate, whereas 1 d-f are obtained from 2-chloro-4,4,5,5-tetrakis(trifluoromethy 1) -1,3, 2λ3-dioxaphospholane and the aminosilanes RNH(SiMe3) (R = t-Bu, SiMe3) or the amide (Me3Si)2NLi, respectively. Addition of chlorine to 1 a-f yields the covalent 2,2-dichloro-1,3,2 λ5-dioxaphospholanes 2 a-f which furnish the spirophosphoranes 3 a-f upon reaction with dilithiumperfluoropinacolate. The X-ray structure analysis of 3 a exhibits an almost ideal trigonal bipyramid having a very short P-N bond distance (1.590 Å) and H ··· O distance (2.34 Å).
Über die inhibierende Wirkung grenzflächenaktiver Stoffe auf die polarographische Reduktion von Cd2+ -, Zn 2+ -und Co 2+ -Ionen in wasser-methanolischen und methanolischen Lösungen / On the Inhibition Effect of Surfactants on the Polarographic Reduction of Cd 2+ , Zn 2+ and Co 2+ Ions in Aqueous Methanolic and Methanolic Solutions
Authors: Markopoulos J. , Jannakoudakis D. 
Published: February 2015

The inhibition effect of tri-n-octylphosphine oxide (TOPO), triphenylarsine oxide (TAsO), triphenylphosphine oxide (TPO), triphenylarsine (TPAs) and triphenylphosphine (TPP) on the polarographic reduction of Cd2+, Zn2+ and Co2+ ions in aqueous methanolic and methanolic solutions has been studied.
A different action of the inhibitors was obtained for each reducible ion. No change in the mechanism of the cathodic reductions has been observed. In all systems TOPO appeared to be the strongest inhibitor.
Schwefel(VI)-oxid-chlorid-imide und Schwefel(VI)-oxid-fluorid-imide [1] / Sulfur(VI)-oxide-chloride-imides and Sulfur(VI)-oxide-fluoride-imides [1]
Authors: Mews Rüdiger , Kricke Peter , Stahl Ingo 
Published: February 2015

Abstract
At room temperature in the presence of CsF sulfur-oxide-chloride-fluoride-imides RfNSOFCl (8) (Rf = CF3, C2F5, i-C3F7, C6F5) are formed from N-perfluoroalkyl-sulfinyl-imides and Cl2. At prolonged reaction times or higher temperatures the chloride is ex-changed and the difluorides RfNSOF2 are isolated in high yields. In the same way (CF3)2CFNS(O)ClCF3 (12) and (CF3)2CClNS(O)ClCF3 (13) are obtained from (CF3)2C = N-S(O)CF3 (9) and Cl2/CsF. 12 can be fluorinated by CsF to give (CF3)2CFNS(O)FCF3 (14). 14 is also observed, when fluorine is added to 9 via XeF2 in the presence of BF3, but mainly C-S-bond cleavage occurs. SF5NS(O)FCF(CF3)2 (19) was identified by spectroscopic methods from the reaction of SF5NSOF2 and CF3CF = CF2 in the presence of CsF.
Neue Verbindungen mit der Ca9Mi4Bi9-Struktur: Zur Kenntnis von Ca9Cd4Bi9, Sr9Cd4Bi9 und Ca9Zn4Sb9 / New Compounds with the Ca9Mn4Bi9 Structure: Ca9Cd4Bi9, Sr9Cd4Bi9, and Ca9Zn4Sb9
Authors: Brechtel Erwin , Cordier Gerhard , Schäfer Herbert 
Published: February 2015

The new compounds Ca9Cd4Bi9, Sr9Cd4Bi9 and Ca9Zn4Sb9 crystallize in the orthorhombic system (Pbam) in the Ca9Mn4Bi9 structure with the following constants:
Ca9Cd4Bi9: a = 2258 ± 2 pm, b = 1278 ± 1 pm, c = 474 ± 1 pm.
Sr9Cd4Bi9: a = 2347 ± 2 pm, b = 1327 ± 1 pm, c = 489 ± 1 pm.
Ca9Zn4Sb9: a = 2192 ± 2 pm, b = 1250 ± 1 pm, c = 454 ± 1 pm.
cis-Dichloro-(1 ,5-bisdiphenylphosphanopentane)platinum(II). Synthese, Krystall– und Molekülstruktur / cis-Dichloro-(1 ,5-bisdiphenylphosphanopentane)platinum(II). Synthesis, Crystal and Molecular Structure
Authors: Klein Heinz-Peter , Thewalt Ulf , Zettlmeißl Heinz , Brune Hans Albert 
Published: February 2015

Abstract
The title compound has been prepared in high yield from K2[PtCl4] and 1,5-bis(diphenylphosphano) pentane in dry CH2Cl2. The crystals are monoclinic, space group P21/c with lattice parameters a = 11.733(3), b = 17.229(5), c = 13.743(4) Å, and β= 92.37(3)°; Z = 4.
An X-ray analysis shows that the complex is monomeric and that it has a planar cis-configuration.
Electron Spin Resonance Studies on Conformational Changes of the Sarcoplasmic Reticulum Ca2+ – ATPase Induced by Synergistic Action of Calcium and ATP
Authors: Laggner Peter , Suko Josef , Punzengruber Christian , Prager Rudolf 
Published: February 2015

Abstract
Changes in motional properties of the -SH group environment in sarcoplasmic reticulum ATPase [1] induced by addition of specific ligands to sarcoplasmic reticulum membrane vesicles were investigated systematically by electron spin resonance (e.p.r.) spectroscopy. Alternatively, two kinds of iodoacetamide analog spin labels, 4-(2-iodoacetamido)- 2,2,5,5-tetramethyl-1-pyrrolidinyl-N-oxyl (label I) and 4-(2-iodoacetamido)-2,2,6,6-tetramethyl- 1-piperidinyl-N-oxyl (label II) were used. The labeling conditions were chosen such that less than three moles of -SH groups per mole of ATPase reacted with the spin labels.
A marked increase in isotropic motion of either spin label was observed on addition of calcium in millimolar concentrations plus ATP or β-γ-methylene ATP. Qualitatively similar but smaller changes were also observed with inosine 5'-triphosphate (ITP), acetylphosphate, or ADP in the presence of calcium. These effects were independent of added magnesium. The spectral changes induced by β-γ-methylene ATP, which binds to the ATPase but is not hydrolyzed, and those of calcium plus ADP suggest a conformational change due to simultaneous binding of these ligands in the absence of enzyme phosphorylation. These changes in e.p.r. spectra were different in quality and magnitude from those observed upon separate binding of calcium or adenine nucleotides.
The two spin labels, differing only in their numbers of heterocyclic ring atoms, were found to reflect environmental changes in different ways. This demonstrates the usefulness of employing different spin labels to detect and interpret structural transitions in macromolecular assemblies.
Taifine, a New Alkaloid from Ruta chalepensis L
Authors: El-Tawil B. A. H. , El-Beih F. K. A. , Budzikiewicz H. , Möhr N. 
Published: February 2015

Abstract
From Ruta chalepensis L. (Rutaceae) a new alkaloid, taifine, has been isolated. Its structure has been determined as 9-ethyl-7-methoxyfuro[2,3-b]quinolone-4.
Untersuchung der symmetrischen Phosphat-Valenzschwingung in gemischten Calcium-Strontium-Apatiten / Investigation on the Symmetric Phosphate Stretching Vibration in Mixed Calcium -Strontium -Apatites
Authors: Apella M. C. , Etcheverry S. B. , Baran E. J. 
Published: February 2015

Abstract
The distortive effects produced by the sub-stitution of Ca(II) for Sr(II) upon the PO4
3-ions in the Ca10(PO4)6(OH)2 and Ca10(PO4)6F2 lattices have been investigated. The study is based on the behaviour of the symmetric stretching frequency of the anion in series of solid solutions containing both cations.