bluuebunny/crossref_metadata_2025_split huggingface dataset:
Oxidation of Mandelic Acid by Os(VIII)
Authors: Chandwani B. L. , Menghani G. D. 
Published: February 2015

Abstract
Mandelic Acid, Osmium(VIII) In the reaction between mandelic acid and Os(VTII), the rate of Os(VIII) disappearance was found to be proportional to the concentration of mandelate ion and Os(VIII). At low and high hydroxyl ion concentration the rate shows second and zero order dependence respectively. The reaction was studied at different temperatures and various activation parameters ⊿E, PZ, ⊿S* etc. were evaluated.
13C, 1H-Spin-Spin Kopplungskonstanten Teil III: Naphthalin / 13C, 1H Spin-Spin Coupling Constants Part III: Naphthalene
Authors: Seel Horst , Aydin Rafet , Günther Harald 
Published: February 2015

Abstract
Using a newly developed technique that employs highly deuterated compounds and 2H broadband decoupling the 13C, 1H spin-spin coupling constants for naphthalene have been measured from the 13C NMR spectra of α-and β-H-[D7]naphthalene. A linear dependence of the 3J(13C, 1H) data on the central π-bond order is indicated.
Synthesis of Sulphones from Sulphonyl Fluorides and Organometallic Compounds
Authors: Khodair Ahemd I. , Abdel-Wahab A. A. , El-Khawaga A. M. 
Published: February 2015

Abstract
The reaction between sulphonyl fluorides and arylmagnesium bromides was investigated. The good yields of sulphones obtained demonstrates the potentialities of this reaction as a synthetic method for sulphones.
Cadmium reagents were found to be unreactive toward the same sulphonyl fluorides.
Cis- und trans-1.3-Diisopropyl-2.4-bis-(diisopropylamino)-1.3.2.4-diazadiphosphetidin / Cis- and trans-1,3-Diisopropyl-2,4-bis-(diisopropylamino)-1,3,2,4-diazadiphosphetidine
Authors: Scherer Otto J. , Andres Kurt 
Published: February 2015

Abstract
Thermolysis of the silylated diaminochloro-phosphine (1) yields the cis-and trans-diazadi-phosphetidines (2). These isomers show a great difference in the melting points and 31P-NMR spectra. Hindered P-N rotation is observed for trans-2b.
Synthetic Studies of anti-Leukaemic Alkaloids, IX* / Some Aspects of the Chemistry of C atliar anthine
Authors: -Rahman Atta-ur , Firdous Sadiqa , Basha Anwer 
Published: February 2015

Abstract
Vinblastine and Vincristine are binary indole-indoline alkaloids occurring in traces in the leaves of Vinca rosea. They are among the most powerful chemotherapeutic agents available to man for the treatment of a variety of cancers. Their high cost and complexity of structure has attracted the attention of many eminent chemists towards their synthesis. The first synthesis of both these anti-tumour alkaloids was reported by us last year [7] starting from two major alkaloids, catharanthine and vindo-line, which co-occur in the same plant. Some aspects of the chemistry of catharanthine are now presented including a novel one-step de-carbomethoxylation reaction with H2S in glacial acetic acid and a reversible isomerization of catharanthine with sodium borohydride. A study of the life-time of catharanthine in hot glacial acetic acid substantiates the earlier work of the Anglo-French group on the biosynthesis of indole alkaloids.
Die Kristallstruktur des Zinnsulfidiodids Sn4SI6 / The Crystal Structure of Sn4SI6
Authors: Fenner Jürgen 
Published: February 2015

Abstract
The new ternary tin(II) sulfide iodide Sn4SI6 was prepared by annealing of stoichiometric amounts of SnI2 and SnS at 280 °C. The structure of this compound was determined from three-dimensional X-ray data. The cell parameters for the monoclinic phase are a = 14.129, b = 4.425, c = 25.15 Å, and β = 93.42°; space group C2/m (No. 12), Z = 4. Parts of the structure are built up of the Snl2 structure.
K2PtS15, Synthese und Kristallstruktur / K2PtS15, Synthesis and Crystal Structure
Authors: Spangenberg Manfred , Bronger Weif 
Published: February 2015

Abstract
K2PtS15 can be synthesized from solutions of potassium polysulfide and hexachloro-platinic acid. X-ray investigations on single crystals revealed its structure. Similar to the ammonium salt (NH4)2PtS15 2 H2O, the Pt-atom of the PtS15
2-anion is found in an octahedral environment consisting of three bidentate five-membered sulfur chains.
Darstellung, Kristallstruktur und Eigenschaften von Au7P10I / Formation, Crystal Structure and Properties of Au7P10I
Authors: Binnewies Michael 
Published: February 2015

Abstract
Au7P10I can be prepared by chemical transport with iodine in a temperature gradient 900 °C→ 450 °C. The crystal structure has been determined. The compound shows metallic conductivity; its thermal stability has been studied.
Die Kristallstruktur von 2.2'-Bipyridin-bis(brenzkatechyl)phosphoniiimhexafluorophosphat / Crystal Structure of 2,2'-Bipyridine-bis(o-phenylenedioxy)phosphonium Hexafluorophosphate
Authors: Sheldrick William S. , Schmidpeter Alfred , Criegern Thomas von 
Published: February 2015

Abstract
2,2'-Bipyridine-bis(o-phenylenedioxy)phosphonium hexafluorophosphate crystallises in the monoclinic space group C2/c (Z = 8) with a = 18.654(4), b = 10.131(2), c = 24.344(4) Å, β = 99.53(4)°. The cationic phosphorus atom displays an octahedral coordination slightly distorted towards the tetrahedral one of an uncomplexed phosphonium center. The OPO bond angles are between 91.6 and 95.7(2)°, the NPN angle of the bipyridine chelate ring in contrast is only 81.7(2)°. The ring systems of the bipyridine ligand are inclined slightly to one another at an angle of 4.7°. The bond lengths to the cationic phosphorus are P - 0 1.668-1.672(3), P-N 1.896(4) and 1.898(4) Å. The hexafluorophosphate anion is disordered
The Crystal Structure of a Spirocyclic Cyclophosphazene N3P3(NMe2)4(NHCH2CH2NH) - Evidence for Intermolecular Hydrogen Bonding
Authors: Sudhakara Babu Y. , Manohar H. , Ramachandran K. , Krishnamurthy S. S. 
Published: February 2015

Abstract
An X-ray crystal structure analysis of tetrakis(dimethylamino)(ethylenediamino)cyclotriphosphazene reveals a novel spirocyclic structure with the spiro ring having an envelope conformation. There is evidence for an intermolecular N-H ··· N bond in the crystal which persists in solution
Chemie polyfunktioneller Liganden, XLIV [1] Darstellung und Eigenschaften von 1.1.1-Tris(diiodarsinomethyl)ethan / Chemistry of Polyfunctional Ligands, XLIV [1] Preparation and Characterization of 1,1,1-Tris(diiodarsinomethyl)ethane
Authors: Eilermann Jochen , Schössner Horst , Lindner Helmut A. 
Published: February 2015

Abstract
The phenylalkyl arsine CH3C[CH2As(C6H5)2]3 reacts with gaseous HI by selective cleavage of the arsenicphenyl bonds yielding CH3C(CH2AsI2)3. This compound is characterized using IR, FIR, Raman, 1H NMR and electron impact mass spectroscopy
Cis-2-telluro-1.3.2λ5.4λ3-diazadiphosphetidin - Kristallstruktur eines in Lösung fluktuierenden Redoxsystems / Cis-2-telhirium-1.3.2λ5.4λ3-diazadiphosphetidine - Crystal Structure of a Redox System Fluctuating in Solution
Authors: Pohl Siegfried 
Published: February 2015

Abstract
The crystal structure of the title compound was determined from single crystal X-ray data. The compound crystallises in the orthorhombic space group Pnma. In contrast to the solution where fluctuating P-Te bonds have been established by NMR analyses the crystals contain isolated molecules with fixed P-Te bonds (bond length: 235.4 pm). The four-membered phosphorus nitrogen ring exhibits significant deviations from planarity. The P-N bond lengths were found to be 168.3 and 175.0 pm, respectively
Production and Reaction of Singlet Oxygen in Aqueous Micellar Solutions Using Pyrene as Photosensitizer
Authors: Miyoshi Norio , Tomita Giiti 
Published: February 2015

Abstract
The reaction of singlet oxygen with 1,3-diphenylisobenzofuran was investigated in aqueous micellar solutions of sodium dodecyl sulfate and dodecyl trimethylammonium chloride using pyrene as photosensitizer. Singlet oxygen, produced by the photosensitization of pyrene bound to micelles, oxidized efficiently 1,3-diphenylisobenzofuran bound to micelles. The quantum yield for singlet oxygen production and the rate constant for furan oxidation were determined by the kinetic analysis for the oxidation reaction of furan. Quenching of singlet oxygen by sodium azide competed with the furan oxidation, and its rate constant was also determined.
Results obtained were compared with those in methanolic solutions. The quantum yield for singlet oxygen production and the rate constant for furan oxidation were much higher in micellar solutions than those in methanolic solutions. Empty micelles wxas found to act as a considerably strong scavenger for singlet oxygen. The penetration probability of singlet oxygen from aqueous phase into the interior of micelles which bound furan was also estimated
Elementorganische Amin/Imin-Verbindungen, XVIII [1] Amino-Imino-Thiophosphorane: σ3, λ5-Phosphazene / Elementorganic Amino/Imino Compounds, XVIII [1] Aminoiminothiophosphoranes: σ3, λ5-Phosphazenes
Authors: Scherer Otto J. , Külbach Ngoc-Tram , Glässel Walter 
Published: February 2015

Abstract
The reaction of the aminoiminothiophosphoranes (1) with methanol yields the bisamino-thiophosphoric acid derivatives (3). la and IVb → VTb element halides form the new P-N element four membered rings 4 →7, which partially exist as a mixture of eis and trans isomers. Different ylide group transfer is observed on the reaction of la with trimethyl -phosphine or trimethyl phosphite. With trimethylphosphine (CH3)3P(S) and a phos-pha(III)azene are formed, with trimethyl phosphite (CH3O)3P = NC(CH3)3 and the [2 + 2] cycloaddition product of la and (R3C)(R3Si)N-P = S (R = CH3) can be isolated.
Synthesis of 2-Methyl-l-phenylthiocarbamoylglyoxal Arylhydrazones and Diethyl(arylazo)(phenylthiocarbamoyl)malonate and their Reactions with Hydrazines
Authors: Amer Fathy. A. , Harhash Abdel Hamid , Awad Mary L. 
Published: February 2015

Abstract
Treatment of a-phenylthiocarbamoyl acetyl acetone (1) with aromatic diazonium salts effects acetyl cleavage with the formation of 2-methyl-I-phenylthiocarbamoylglyoxal arylhydrazones (2a-c), which afford the anilinopyrazoles (5a-c) and the phenylimino-2- pyrazolines (6a-c) on treatment with hydrazine or phenyl hydrazine respectively.
Treatment of diethyl a-phenylthiocarbamoyl malonate with aryl diazonium salts gave diethyl (arylazo)(phenylthiocarbamoyl) malonate which afford the 7-phenyl-5-(arylazo)- 2,3,7-triazabicyclo[3,2,0]hept-I-ene-4,6-dione (9a, b) and its 3-phenyl derivatives (9c, d) with hydrazines and phenyl hydrazine respectively
Notiz zur Absolutkonfiguration des Epoxipiperolids / Note on the Absulute Configuration of Epoxipiperolide
Authors: Hansel Rudolf , Schulz Jutta 
Published: February 2015

Abstract
The epoxide-ring of (+)-5-[trans-(Z)-2,3- epoxy-1-methoxy-propylidene]-4-methoxy- 2(5H)-furanone (1) was opened hydrogenolytically (palladium/charcoal) to (+)-(2S)-5-(2-hydroxy-1-methoxy-3-phenylpropylidene)- 4-methoxy-2(5H)-furanone (2) whose absolute configuration (2S) was determined applying Horeau's method. For the natural product (+)-1 itself follows (2S,3R) Reconfiguration
Darstellung und Kristallstruktur von Na2AgAs und KCuS / Preparation and Crystal Structure of Na2AgAs and KCuS
Authors: Savelsberg Gerhard , Schäfer Herbert 
Published: February 2015

The title compounds have been prepared and their structures determined. Na2AgAs crystallizes in the Na2CuAs structure type, forming infinite Ag-As-zig-zag-chains. KCuS builds up a new structure type but with similar zig-zag-chains of Cu- and S-atoms. Crystallographic data:
Na2AgAs: C2221, a= 879 ± 2 pm, 6 = 736 ± 2 pm, c = 559 ± 2 pm;
KCuS: Pna21, a = 1066 ± 2 pm, 6 = 620 ± 2 pm, c = 532 ± 2 pm.
Ion Association and Solvation in Dichloromethane of Tetrachloro-and Tetrabromoferrates(III) Compared with Simple Halides
Authors: Bait S. , Chattel G. du , Kieviet W. de , Tieleman A. 
Published: February 2015

Abstract
Conductivity measurements are reported in dichloromethane for tetraethylammonium and tetraphenylarsonium salts of tetrachloro-and tetrabromoferrate(III) and halide ions (chiefly chloride and bromide). Analysis of the data in terms of the recent Fuoss equation has given the ion-pair association constants. The experimental values are close to the ones calculated from the electrostatic Fuoss-Eigen equation. The solvent acts as an acceptor by way of forming hydrogen-bonds to the simple halide ions and to a much less extent to the ferrates. Solvation of chloro-and bromoferrates(III) seems to be comparable, as deduced from the association constants and NMR paramagnetic line broadening. The phenyl groups of the tetraphenylarsonium ion seem to give π-interaction with the solvent.
Die Ultraviolettspektren der Halogenazide ClN3, BrN3 und IN3 / The Ultraviolet Spectra of the Halogen Azides ClN3, BrN3 and IN3
Authors: Dehnicke Kurt , Ruschke Peter 
Published: February 2015

Abstract
The ultraviolet spectra of the halogen azides ClN3, BrN3 and IN3 were recorded in hexane solution as well as in carbon tetrachloride solution. The spectra are in agreement with Cs-symmetry of the XN3 species and correspond well with other covalent azides.
Fragmentation of the α-Amino Acid Methionine in Field Desorption Mass Spectrometry
Authors: Greef J. van der , Nibbering N. M. M. , Schulten H.-R. , Lehmann W. D. 
Published: February 2015

Abstract
Field Desorption Mass Spectrometry, a-Amino Acid Methionine The fragmentation of methionine in field desorption mass spectrometry has been studied. Decomposition mechanisms are described which are based on stable isotope labelling, low and high resolution field desorption, and the application of field desorption kinetics. The combined use of these techniques for the study of some fundamental fragmentations in field desorption is demonstrated successfully. Further, a comparison with the fragmentation pattern of methionine under electron impact, chemical ionization and Curie point pyrolysis is given.
CaAl2Se4 und SrAl2Se4 — Strukturvarianten des TlSe-Typs / CaAl2Se4 and SrAl2Se4 -Variants of the TlSe-Structure
Authors: Klee Wilfried , Schäfer Herbert 
Published: February 2015

Abstract
CaAl2Se4 and SrAl2Se4 have been prepared and their crystal structures determined. They crystallize orthorhombically, space group Cccm, with the lattice constants:
CaAl2Se4: a = 633 ± 1pm, b = 1048 ± 1pm, c = 1053 ± 1pm;
SrAl2Se4: a = 627 ± 1 pm, b = 1082 ± 1 pm, c = 1085 ± 1 pm.
The structures of these compounds are closely related both to each other and to the TlSe-structure.
Kristall- und Molekülstruktur von 5.10-Dihydro-5.10-diniethylphenaziniiimtniodid und 5.10-Dihydro-5.10-diethylphenaziniumtriiodid / Molecular and Crystal Structure of 5,10-Dihydro-5.10-dimethylphenaziniumtriiodide and 5.10-Dihydro-5.10-diethylphenazinium triiodide
Authors: Keller H. J. , Moroni W. , Nöthe D. , Scherz M. , Weiss J. 
Published: February 2015

Oxidation of 5,10-dihydro-5,10-dimethylphenazine and 5,10-dihydro-5,10-diethyl-phenazine under different reaction conditions leads to several iodine containing solids. The preparation and X-ray structure of two of them, 5,10-dihydro-5,10-dimethyl-phcnaziniumtriiodide (3) and 5,10-dihydro-5,10-diethylphenaziniumtriiodido (4) are reported here.
Compound 3 crystallizes in space group P21/n with lattice parameters a = 8.552(6) Å, b= 16.953(2) Å, c- 12.157(9) Å and β= 103.46(2)° with four formula units in the unit cell. The structure was refined to an R-value of 0.046 using 2387 independent reflections. The lattice constains distinct, slightly distorted triiodide ions and bent 5,10-dihydro-5,10-dimethylphenazinium radical cations. Compound 4 crystallizes in the same space group P21/n with lattice parameters a = 8.531(6) Å, b = 8.332(21) Å, c = 13.320(15) Å and β= 94.44(19)° with two formula units in the unit cell. The structure was refined to an R-value of 0.076 using 1195 independent reflections. The lattice contains strictly linear symmetrical triiodide ions and planar centrosymmetrical 5,10-dihydro-5,10-diethyl- phenazinium radical cations.
Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, VIIa Ein neuer einfacher Weg zur Berechnung von [(O,F)/Me]-Werten bei Blockstrukturen / Contributions to the Study of Inorganic Non-Stoichiometric Compounds, VIIa A New Simple Method to Calculate Values of [(O,F)/Me] for Block Structures
Authors: Hibst Hartmut , Gruehn Reginald 
Published: February 2015

Abstract
A simple, quick and reliable method is derived to calculate values of [(O,F)/Me] for block structures. The method of calculation is exemplified using ideal and real (defect) block structures and inconsistent published data. The method represents a simple means to systematically classify block structures.
NOTIZEN: Al(H2PO4)(HPO4)(H2O), ein saures Phosphat mit zweidimensionaler Al-O-P - Vernetzung / Al(H2PO4)(HPO4)(H2O), an Acid Phosphate with Two-Dimensional Al-O-P Linking
Authors: Kniep Rüdiger , Mootz Dietrich , Wilms Axel 
Published: February 2015

The crystal structure of aluminium-dihydrogenphosphate- monohydrogenphosphate-monohydrate contains macromolecular units

2
∞[Al(H2PO4)(HPO4)(H2O)]
consisting of Al(O)5(H2O) octahedra which share vertices with P(O)2(OH)2 and P(O)3(OH) tetrahedra. Neighbouring layers are linked by hydrogen bonds.
Stabile Quecksilber(I)-Selen-Verbindungen, 2. Mitteilung Die Struktur der roten Modifikation des Tetrakis(diphenylseleno)- diquecksilber(I)-bis(chlorat(VII))/ Stable Mercury(I)-Selenium Compounds, 2nd Communication The Structure of the Red Modification of Tetrakis(diphenyl-seleno)-dimercury(I)-bis(chlorate(VII))
Authors: Brodersen Klaus , Liehr Günter , Rosenthal Michael , Thiele Gerhard 
Published: February 2015

Abstract
As shown by X-ray analysis the structure of the red modification of tetrakis(diphenyl-seleno)-dimercury(I)-bis(chlorate(VII)) contains cations [(C6H5)2Se]2Hg-Hg[Se(C6H5)2]2
⊕⊕ and ClO4
--anions. The twofold coordination of each mercury atom by 2 selenium atoms is remarkable for a mercury(I) compound. The relations between red and yellow modifications are discussed.
Molybdännitridbromid, MoNBr3/Molybdenumnitridobromide, MoNBr3
Authors: Dehnicke Kurt , Krüger Norbert 
Published: February 2015

Abstract
Molybdenumnitridobromide, MoNBr3, is prepared by the reaction of MoBr4 with iodine azide in CCl4 suspension. Some properties are given. The IR spectrum is discussed, which is in agreement with a M ≡ N triple bond.
Molekülstruktur des 7-Methyl-1.3.5-triaza-7-phosphaadamantan-7-ium-tetrafluoroborats. Darstellung und Charakterisierung des 7-Methyl-1.3.5-triaza-7-phospha-tricyclo[3.3.2.13,7]-undecan-7-ium-iodids/Molecular Structure of 7-Methyl-1 ,3,5-triaza-7-phosphaadamantane-7-ium-tetrafluoroborate. Preparation and Characterization of 7-Methyl-1,3,5-triaza-7-phospha-tricyclo[3,3,2,1 3,7]-undecan-7-ium-iodide
Authors: Jogun Kurt H. , Stezowski John J. , Fluck Ekkehard , Weißgraeber Hans-Jürgen 
Published: February 2015

Abstract
7-Methyl-1,3,5-triaza-7-phosphaadamantane-7-ium-tetrafluoroborate (2b) has been synthesized and characterized by crystal structure analysis. The crystal structure is interpreted in comparison with the parent compound 1,3,5-triaza-7-phosphaadamantane, and its 7-oxide and 7-sulfide. 7-Methyl-1,3,5-triaza-7-phospha-tricyclo[3,3,2,1 3,7]-undecan-7-ium-iodide (6) has been prepared and characterized by 31P, 13C, and 1H NMR spectroscopy and by its IR spectrum.
Oberflächenverbindungen von Übergangsmetallen, XX Komplexe von Oberflächen-Chrom(II) mit Olefinen /Surface Compounds of Transition Metals, XX Complexes of Surface Chromium(II) with Olefines
Authors: Krauss Hans-Ludwig , Westphal Ulrich 
Published: February 2015

Abstract
Surface chromium(II) supported on silica forms 1:1 and 1:2 complexes with defines; polyenes prefer chelate structures. For the ligand-to-metal bond a “Zeise-Salt” type is postulated. Secondary reactions include cis-trans isomerisation, shift of double bond, rearrangement of C-framework and polymerization/oligomerization. Cyclopentadiene obviously gives a h5 -cyclopentadienyl/hydrogen complex by oxidative addition followed by H2 emission and formation of a h5 -cp-CrIII complex; in this case the metal can be split off from the support by H+ without cleavage of the cp-Cr-bond.
Photochemische Reaktionen von Übergangsmetall-Olefin-Komplexen, II Die Umsetzung von Tricarbonyl-η-1.3.5-cycloheptatrien-chrom(O) mit substituierten Fulvenen /Photochemical Reactions of Transition Metal Olefin Complexes, II The Reaction of Tricarbonyl-η-1,3,5-cycloheptatriene-chromium(O) with Substituted Fulvenes
Authors: Kreiter Cornelius G. , Kurz Hans 
Published: February 2015

Abstract
When tricarbonyl-η-1,3,5-cycloheptatriene-chromium(O) (1) and 6,6-dimethylfulvene or tricarbonyl-η-6,6-dimethylfulvene-chromium(O) and 1,3,5-cyeloheptatriene are irradiated with UV light, a red crystalline dicarbonyl-chromium complex with an η3 -1′,2′,3′-(2-cyclohepta-2′, 4′ -dien 1′ ,6′-ylene)-η5 (2-cyclopentadienylidene)propane chelate ligand, Cr(CO)2C15H18 (2), is formed in high yields. Under the same conditions, 1 with 6,6-diphenylfulvene yields two isomeric complexes. One of them, Cr(CO)3C25H22 (3), is analoguous to 2 and contains the η3 -1′,2′,3′-cyclohepta-2′,4′-dien-1′ ,6′ / -ylene-η5 -cyclopentadienylidene-diphenyl-methane chelate ligand. The other one is the dicarbonyl η3 -1′,2′,3′-cyclohep-tatrienyl- η5 diphenylmethylcyclopentadienyl-chromium(O), Cr(CO)2(C7H7)(Ci8H15) (4). The complexes were characterized by analysis and mass spectra. The structures are based on IR, and 1H and 13C NMR spectra. Einführung
Elementorganische Amin/Imin-Verbindungen, XIX Phospha(III)azen-Komplexe des Platins /Elementorganic Amino/Imino Compounds, XIX Phospha(III)azene Complexes of Platinum
Authors: Scherer Otto J. , Kuhn Norbert , Jungmann Heribert 
Published: February 2015

Abstract
Reacting Zeise's salt with the phospha(III)azene (R3C)(R3Si)N-P = N-CR3 (R = CH3) (1) one gets the platinum phospha(III)azene complex (2), Cl2PtIL2 (L = 1). 2 adds water and methanol to the P = N bond of the phospha(III)azene ligand with formation of 3, Cl2Pt(PRR2
1)2 (R = (CH3)3SiO, R1 = (CH3)3CNH) and 4, Cl2Pt(PRR1R2)2 (R = CH3O, R1 = (CH3)3CNH, R2 = (CH3)3SiNC(CH3)3). 2, 3 and 4 have trans configuration, 4 also forms a mixture of the meso and d, 1 isomers. For 2 a P-σ coordination of the phospha(III)- azene ligand is proposed.
Diazadien-Nickel-Komplexe, I: Bis(diazadien)-nickel(O) und Bromo-diazadien-nickel(I) / Diazadiene Nickel Complexes, I: Bis(diazadiene) Nickel(O) and Bromo-diazadiene Nickel(I)
Authors: Dieck Heindirk tom , Svoboda Michael , Kopf Jürgen 
Published: February 2015

Abstract
Reduction of anhydrous nickel(II) compounds in the presence of diazadienes RN=CR'-CR' = NR, |(DAD), yields (DAD)2Ni(0). This complex 1 with R = CH(i-C3H7)2 is especially reactive and comproportionates with DADNiBr2 (2) to yield the bromobridged dimeric nickel(I) species (DADNiBr)2 (3). The crystal and molecular structure of 3 has been determined by single crystal X-ray diffraction: Space group Pbca with a = 1225.8(12), b = 1474.8(14) and c = 2167.4(22) pm; Ra = 0.076, 1034 reflections. Catalytic tetramerisation of substituted alkynes with 1 is discussed in view of the very easy formation of dimers 3.
Darstellung, Eigenschaften und Struktur des Cyclopentadienyl(1.3-diborolenyl)nickel-Sandwiehs [1] / Synthesis, Properties and Structure of the Cyclopentadienyl(1,3-diborolenyl)nickel Sandwich [1]
Authors: Siebert Walter , Bochmann Manfred , Edwin Joseph , Krüger Carl , Tsay Yi-Hung 
Published: February 2015

Abstract
1,3,4,5-Tetraethyl-2-methyl-1,3-diborolene (5) reacts with nickelocene and dimeric cyclopentadienylcarbonylnickel, yielding orange red 4 a, a diamagnetic nickelocene analogue. 1H and 11B NMR data indicate a sandwich structure, which is confirmed by X-ray structure analysis. The title compound crystallizes in the space group Pnma with a = 9.265(I), b = 15.1343(9), c = 12.777(2) Å and four molecules in the unit cell. All metal carbon distances are similar to those of the isoelectronic ferrocene.