bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Crystal Structures of Et2Sn(O2PMe2)2 and Ph2Sn(O2PMe2)2; Synthesis and Spectral Studies of Ph2Sn(O2PMe2)2
Authors: Shihada Abdel-Fattah , Weller Frank 
Published: August 2018

Abstract
Ph2Sn(O2PMe2)2 has been synthesized by the reaction of HO2PMe2 with Ph2SnO in toluene or by treating HO2PMe2 with Ph2SnCl2 in methanol. X-ray diffraction studies of Et2Sn(O2PMe2)2 and Ph2Sn(O2PMe2)2 show that the O2PMe2 ligands function as bidentate bridges between the tin atoms. The ethyl and the phenyl groups are in trans-position in the resulting octahedral environment around tin. Et2Sn(O2PMe2)2 crystallizes in the monoclinic space group P21/n (a = 817.11(9), b = 974.1(1), c = 970.1(1) pm, β = 113.749(6)°, Z = 2 and R = 0.032) and con­sists of a polymeric layer structure with centrosymmetric (SnOPO)4 sixteen-membered rings. Ph2Sn(O2PMe2)2 also crystallizes monoclinically in the space group P21/n (a= 1060.9(1), b = 999.4 (1), c = 1768.9(2) pm, β = 90.93(1)°, Z = 4 and R = 0.057) and has a polymeric ring-chain structure with centrosymmetric (SnOPO)2 eight-membered rings. The IR and Raman spectra of Ph2Sn(O2PMe2)2 have been assigned and discussed in the light of structural information. The Sn(O2PMe2)+ ion represents the base peak in the mass spectrum of Ph2Sn(O2Me2)2.
Substituierte 1,2,4-Thiadiazolium-dichloroaurate(I) und -tetra- chloroaurate(III) als Reaktionsprodukte von N-Thiocarbamoyl- benzamidinen mit TetrachIorogold(III)-Verbindungen / Substituted 1,2,4-Thiadiazolium dichloroaurates(I) and -tetrachloroaurates(III) as Products o f the Reaction o f N -Thiocarbam oyl-benzamidines with Tetrachlorogold(III) Compounds
Authors: Schröder Uwe , Richter Rainer , Hartung Jürgen , Abram Ulrich , Beyer Lothar 
Published: August 2018

Abstract
The reactions of N-diethylaminothiocarbonyl-benzamidines Et2N-C(S)-N=C(NHR)-Ph (1: R = Ph, 2: R = C3H7, 3: R = H) with gold(III) compounds were studied. Treatment of 1 and 2 with equivalent amounts of tetrachlorogold acid gives 2,3-substituted 5-diethylamino-1,2,4- thiadiazoliumdichloroaurates(I) (1a, 2a). With tetrachlorogold acid in excess 1 yields 2,3-diphenyl- 5-diethylamino-l,2,4-thiadiazolium-tetrachloroaurate(III) 1b. With 3 and Na[AuCl4] bis(3-phenyl-5- diethylamino-1,2,4-thiadiazolium)-chloride-tetrachloroaurate(III) 3b is produced. The structures of la, 2a and 3b were investigated by X-ray structure analysis. In la and 2a the dichloroaurate(I) ions are linear. In the 1,2,4-thiadiazolium cations the N-C-bond lengths alternate characteristically. In 3b the tetrachloroaurate(III) ion is square planar. The 1,2,4-thiadiazolium cation shows a different alternation of N-C bond lengths in comparison with la and 2a which suggests changes in the thiadiazolium ring in 3b to a tautomeric form as confirmed by the localization of the H atom at the N atom in ring position 4 instead of ring position 2. The structures of 1a, 1b, 2a and 3b were confirmed by elemental analysis, ES-MS, FAB-MS, 1H and 13C NMR and IR spectroscopy.
Übergangsmetall-substituierte Acylphosphane und Phosphaalkene, XXXIY [1] Methylendiyl(thioxo)- und MethyIendiyl(selenoxo)-λ5,σ3-phosphorane als μ-Liganden in [(η5-C5H5)2Fe2(CO)3]-Komplexen. Synthese und Struktur von / Transition Metal Substituted Acylphosphanes and Phosphaalkenes, XXXIV [1] Methylenediyl(thioxo)- and M ethylenediyl(selenoxo)-λ5 ,σ3-phosphoranes as μ-Ligands in [(η5-C5H5)2Fe2(CO)3] Complexes. Synthesis and Structure of
Authors: Weber Lothar , Schumann Iris , Scheffer Matthias H. , Stammler Hans-Georg , Neumann Beate 
Published: August 2018

Abstract
The isophosphaalkyne complex (η5-C5H5)2(CO)2Fe2 (μ-CO)(μ-C=PMes) (2a) was converted into the methylenediyl(thioxo)- and methylenediyl(selenoxo)- λ5, σ3-phosphorane complexes (η5-C5H5)2(CO)2Fe2(μ-CO)(μ-C=P(E)Mes) (5a: E = S; 5b E = Se) by oxidation with sulfur or selenium . Reaction of the μ-carbyne complex [(μ75-C5H5)2(CO)2Fe2(μ-CO)(μ- CSMe)]+SO3CF3 (1) with tBuP(H)SiMe3 in the presence of DBU afforded the μ-phosphinocarbyne complex (η5-C5H5)2(CO)2Fe2

(μ-CP(H)tBu] (μ -SMe] (12). μ-Carbene complex

(11) was isolated as an initial product of this conversion and fully characterized by single crystal X-ray analysis.
Notizen: Synthese und Strukturuntersuchungen von Iodocupraten(I), XVIII. Darstellung und Kristallstruktur von PbCu2I4 ·2CH3CN/Synthesis and Structure Investigations of Iodocuprates(I), XVIII. Preparation and Crystal Structure of PbCu2I4 · 2CH3CN
Authors: Hartl Hans , Hoyer Michael 
Published: August 2018

Abstract
Single crystals of PbCu2I4·2(CH3CN) are formed by reaction of Pbl2 with Cul in acetonitril. The compound crystallizes in the mono­clinic space group C2/m; a = 1625.8(3), b = 436.6(1), c = 1025.8(2)pm; β = 94.77(3)°; V = 725.7 pm3 106; Z = 2. The crystal structure is built up by chains of trans-edge sharing 1
∞[PbI6/3] octahedra and corner sharing 1
∞[CuI3/3CH3CN)] tetra­hedra connected by common I-I edges.
Synthesis and Crystal Structure of a Caesium Hydrogen Benzoylcyanoximate Complex with 18-Crown-6: Cs(18-Crown-6){H(L)2}
Authors: Ponomareva Vera V , Skopenko Victor V , Domasevitch Konstantin V , Sieler Joachim , Gelbrich Thomas 
Published: August 2018

Abstract The caesium hydrogen benzoylcyanoximate (L-) complex with 18-crown-6 of composition Cs(18-crown-6){H(L)2} has been prepared and studied by means of X-ray diffraction [monoclinic, space group P21/n, with a = 9.906(1), b = 18.387(3), c = 18.855(3)Å, β = 90.13(1)°, V = 3434.3(9) Å, Z = 4; final R1 = 0.043 for the 6431 independent reflections used. The lattice consists of Cs(18-crown-6)+ cations and complex hydrogen oximate anions {H(L)2}-, formed via strong hydrogen bonding between the oxygen atoms of nitroso-groups [O - - - O ca. 2.456(5)Å]. The caesium atom deviates by 1.492(3) Å from the mean plane of the oxygen atoms of the macrocyclic ether (dominant orientation of disordered ligand, 60%) and adopts a typical “sunrise coordination” [Cs-O (ether) 3.040(9)-3.312(7) Å]. The hydrogen oximate groups are bonded to the metal center only on one side of the crown ether plane via the oxygen atoms of nitroso-groups and the nitrogen atoms of cyano groups (Cs-O ca. 3.040(9), 3.312(7) Å; Cs-N ca. 3.469(5), 3.679(6) Å). The coordination polyhedron of Cs+ can be described as a distorted bicapped tetragonal prism.
Crystal Structure and Conformation of 2-{(2′-Aminobenzyl)iminoethyl}- 5-methoxyphenol
Authors: Dey D. K. , Dey S. P. , Elmali A. , Elerman Y. 
Published: August 2018

Abstract
The Schiff base, 2-{(2′-aminobenzyl)iminoethyl}-5-methoxyphenol, 1,2 -C6H4[NH2-2 ʹ]-CH2N=CHC6H3(OMe-5)OH (I), has been prepared by the reaction of 2 -amino-1-benzylamine and 2-hydroxy-4-methoxyacetophenone in methanol. The molecular structure has been con­firmed by single crystal X-ray crystallography (triclinic, space group P 1̄, a = 7.201(2), b = 9.802(2), c = 9.993(2) Å, α = 83.09(2), β = 73.49(2), γ = 84.09(2)°, R = 0.0415 for 2611 independent reflections). The 1H and 13C NMR spectra in CDCI3 solution indicate the forma­tion of some other minor conformations or dissociation in solution. The title compoundois not planar. Intramolecular hydrogen bonding occurs between O(1) and N(1) atoms [2.528(2) Å], the hydrogen atom essentially being bonded to the nitrogen atom. Minimum energy conformations from AMI were calculated as a function of four torsion angles. The optimized geometry of the molecular structure corresponding to the non-planar conformation is the most stable conformation in all calculations. The results strongly indicate that the minimum energy conformation is primarily determined by non-bonded hydrogen-hydrogen repulsions.
The Chemical Evolution of a Nitrogenase Model, XXIII. The Nature of the Active Site and the Role of Homocitric Acid in MoFe-Nitrogenase
Authors: Palmer John G. , Doemeny Paul A. , Schrauzer Gerhard N. 
Published: August 2018

Abstract
The iron-molybdenum cofactor (FeMo-co) of bacterial nitrogenase is a heterometallic cluster of composition MoFe7S9 that is attached to the apoprotein by a coordinative Mo-N bond to the imidazole group of hisα442, and by a Fe-S bond to cysα215. The molybdenum atom of FeMo-co in the enzyme in addition is coordinated to one molecule of homocitrate (hc), which is required for maximal N2 reducing activity. The molybdenum atom in the enzyme-bound FeMo-co thus is hexacoordinated and cannot react with substrates unless free coordination sites are made available. It is proposed that the reactions of the substrates o f nitrogenase occur at a molybdenum active site consisting of a mononuclear molybdenum homocitrate complex attached to hisα442 of the apoprotein that in the functional enzyme is generated from FeMo-co by a reversible, redox-linked dissociation of the Fe7S9-cys cluster. Studies with catalytic model systems consisting of complexes of molybdenum with imidazole and hydroxocarboxylate ligands support this proposal and provide a rationale for the specific activating effect of homocitrate in nitrogenase.
New Dinuclear Transition Metal Complexes with the [M2(μ-dhbq)]n+ Core and 2-(2′-Pyridyl)quinoxaline (L) as a Terminal Ligand: Preparation and Characterization (dhbq2-= the Dianion of 2,5-Dihydroxy -1,4- benzoquinone; M = AgI, MnII, CoII, NiII, CuII, RuII, PdII, FeIII, RhIII; n = 0, 2, 4)
Authors: Mostafa Sahar I. , Perlepes Spyros P. , Hadjiliadis Nick 
Published: August 2018

Abstract
Synthetic procedures are described that allow access to the new complexes [Mn2(dhbq)L2(H2O)4 (1), [Fe2(dhbq)L2(H2O)4](NO3)4 · 6H2O (2), [Co2(dhbq)Cl2L2(H2O)2] (3), [Ni2(dhbq)Cl2L2(H2O)2] (4), [Cu2(dhbq)Cl2L2(H2O)2] (5), [Ru2(dhbq)L2(H2O)4](ClO4)2 (6), [Rh2(dhbq)Cl2L2(H2O)2]Cl2·2H2O (7), [Pd2(dhbq)L2]Cl2·5H2O (8) and [Ag2(dhbq)L2] (9), where dhbq2- is the dianion of 2,5-dihydroxy-1,4-benzoquinone and L is the biheteroaromatic ligand 2-(2′-pyridyl)quinoxaline. The new complexes were characterized by elemental analyses and by a variety of physical and spectroscopic techniques. Dinuclear structures are assigned for the complexes in the solid state. The two metal ions are bridged by the bischelating dhbq2- ion, while L behaves as a bidentate chelate with the 2′-pyridyl nitrogen and the nearest quinoxaline nitrogen atom as the ligand atoms. The metal ion coordination geometries are octahedral, tetrahedral or square planar.
peri-Interactions in Naphthalenes, 7 [1]. A Hetera-naphthalene as a Model Compound for 8-Dimethylaminonaphth- 1-yl Silicon and Phosphorus Compounds
Authors: Schiemenz Günter Paulus , Näther Christian 
Published: August 2018

Abstract
In a 4-isopropyl-1-oxa-3-oxonia-2-borata-naphthalene the isopropyl group exhibits the same conformational phenomena as the Me2N group in 8-dimethylamino-naphth-1-yl-silanes and related phosphorus compounds. Since the details can be fully rationalized on the basis of the steric situation and electronic factors are excluded, the common features cannot serve to infer dative interaction from nitrogen to silicon / phosphorus resulting in hypercoordination of the third period element atoms in the reference compounds.
Zur Alkylierung von 2,3-Dihydro-1,3-diisopropyl-4,5- dimethylimidazol-2-yliden [1] / On the Alkylation of 2,3-Dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene [1]
Authors: Kuhn Norbert , Göhner Martin , Steimann Manfred 
Published: August 2018

Abstract
The reaction of 2,3-dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (7, Im) and alkyl iodides has been investigated. With MeI, 7 forms a 1/1 mixture of [ImH]I (10) and [ImEt]I (11a) while from the reaction of 7 with EtI an 1/1/1 mixture of 10, 11a and [ImCH(Me)Et]I (11b) is obtained. The mechanism of the reactions is discussed, and the crystal structures of 10 and 11a are reported.
Crystal Structure and Conformation of N-(5-Chlorosalicylidene)- 2-hydroxy-5-chloroaniline
Authors: Elerman Yalçün , Kabak Mehmet , Elmali Ayhan 
Published: August 2018

Abstract
N-(5-Chlorosalicylidene)-2-hydroxy-5-chloroaniline was synthesized and its crystal structure determined. It crystallizes in the orthorhombic space group Pna21 with a = 14.668(4), b = 6.084(3), c = 27.980(4) Å , R = 0.051 for 4788 independent reflections). There are two independent nearly planar molecules in the asymmetric unit. The intramolecular hydrogen bonds occur between the pairs of atoms N1 and O1 [2.553(6) Å], N1 and O2 [2.585(5) Å], N2 and O3 [2.567(6) Å], N2 and O4 [2.620(5) Å], the hydrogen atoms essentially being bonded to the nitrogen atoms. The neighboring molecules are linked via an intermolecular O-H···O hydrogen bond [2.557(5) Å ]. Conformations of the title compound were investigated by semi-empirical quantum mechanical AM1 calculations. The optimized geometry of the molecular structure corresponding to the nearly planar conformation is the most stable conformation in the calculations. The results strongly indicate that the minimum energy conformation is primarily determined by non-bonded steric interactions.
Thermochemische Untersuchungen zu den Systemen SE2O3-SeO2 IV. Lösungskalorimetrie der SE2SexO3+2x-Phasen (SE = Nd, Sm, Y) / Thermochemical Investigations on the Systems RE2O3-SeO2 IV. Solution Calorimetry of the Phases RE2SexO3+2x(RE =Nd, Sm, Y)
Authors: Zhang-Preße M. , Oppermann H. 
Published: August 2018

Abstract
The solution enthalpies have been determined for the ternary phases RE2SexO3+2x existing on the pseudo-binary section RE2O3-SeO2 and for RE2O3 and SeO2 in 4n HCl (RE =Nd, Sm, Y). From these date the enthalpies of formation of the ternary phases have been derived via suitable solution schemes on the basis of the known enthalpies of formation of RE2O3 and SeO2.
Synthesis, Spectroscopic Studies, Crystal Structure and Conformation Analysis of N-(2-Fluoro-3-methoxy)-salicylaldimine
Authors: Ünver H. , Kendi E. , Güven K. , Durlu T. Nuri 
Published: August 2018

Abstract
The new Schiff base ligand N-(2-fluoro-3-methoxy)-salicylaldimine (C14H12NO2F) (1) has been synthesised and studied by using, IR, 1H NMR, 13C NMR, UV-visible, GC-MS techniques, X-ray structure analysis and AM1 semi-empirical quantum mechanical methods. Compound 1 crystallises in the orthorhombic space group P212121 with a =12.5461(1), b =18.0495(1), c =5.2615(1) Å . An intramolecular hydrogen bond connects O1 and N1 [2.575(2)Å], the hydrogen atom being bonded essentially to the oxygen atom. Minimum energy conformations were calculated as a function of two torsion angles θ1 (C6-C7-C8-N1) and θ2 (C7-C8-N1-C9), varied every 10 degrees. The optimized geometry of the crystal structure corresponding to the non-planar conformation is the most stable conformation in all calculations. The results strongly indicate that the minimum energy conformation is primarily determined by hydrogen-hydrogen repulsions between the ortho-hydrogen atoms on the aldehyde rings. Complementary IR, 1H NMR and UV measurements in solution and in the solid state were carried out.
Nitridsulfidhalogenide der leichten Lanthanide vom Typ M6N3S4X (M = La - Nd; X = Cl, Br) mit ausgeordneten Sulfid- und Halogenid-Lagen / Nitride Sulfide Halides of the Light Lanthanides with the Formula Type M6N3S4X (M = La - Nd; X = Cl, Br) with Ordered Sulfide and Halide Positions
Authors: Lissner Falk , Schleid Thomas 
Published: August 2018

Abstract
The oxidation of the light lanthanides (M = La - Nd) with sulfur and NaN3 in the presence of the tribromides MBr3 yields bromine-poor nitride sulfide bromides with the composition M6N3S4Br when appropriate molar ratios of the reactants are used. Additional NaBr as a flux secures complete and fast reactions (7 d) at 850 °C in evacuated silica tubes as well as singlecrystals of the pure phase (brownish needles). The orthorhombic crystal structure (Pnma, Z = 4) was determined from single crystal X-ray data for La6N3S4Br (a = 1159.23(9), b = 410.85(3), c = 2765.6(2) pm), Ce6N3S4Br (a = 1152.31(9), b = 407.52(3), c = 2747.4(2) pm), Pr6N3S4Br (a = 1145.42(9), b = 404.21(3), c = 2729.3(2) pm), and Nd6N3S4Br (a = 1138.59(9), b = 400.94(3), c = 2711.3(2) pm). Six crystallographically different M3+ cations are present, two of them (M1 and M2) build up chain I (1
∝ {[NM2]3+}) by cis-edge connection of [NM4] tetrahedra. The four remainders (M3 - M6) arrange as pairs [N2M6] of edge-shared [NM4] units which are further connected via four vertices to form a double chain (chain II = 1
∝ {[N2M4]6+}). Bundled along [010] like a closest packing of rods, both types of chains are commensurate in translation and held together by one Br- and four S2- anions which, in contrast to an earlier work on the pseudo-isotypic chloride analogues M6N3S4Cl (M = La - Nd), are perfectly ordered.
Peri-Interactions in Naphthalenes, 9 [1]. On Hypercoordination in Non-Quaternary Phosphonium Salts and a Secondary Phosphine with the (8-Dimethylamino-Naphth-1-Yl) Substituent
Authors: Schiemenz Günter Paulus , Näther Christian , Pörksen Simon 
Published: August 2018

Abstract
The 31P NMR data of non-quaternary (8-dimethylamino-naphth-1-yl)phosphonium salts, with emphasis on the 1J(31P, 1H) coupling constants, where scrutinized for their potential to yield information about N→P dative interactions. As for δ (29Si) and 1J(29Si, 1H) in the isosteric silanes, the data do not permit conclusions in favour of such interactions. 1J(31P, 1H) of bis(8-dimethylaminonaphth- 1-yl)phosphine in conjunction with the distances d(N···P) invalidates the basic assumption on which the claim of dative N→P/Si bonding in such phosphorus and silicon compounds rests, viz. that N···P/Si distances of ca. 270 pm are evidence for P/Si-hypercoordination. No evidence for hydrogen bonds N···H-P was found.
Beryllium Dichloride Coordination by Nitrogen Donor Molecules
Authors: Dressel Martina P. , Nogai Stefan , Berger Raphael J. F. , Schmidbaur Hubert 
Published: August 2018

Abstract
The reaction of anhydrous beryllium chloride with nitrogen donors L in diethylether as a solvent under mild conditions affords 1:2 complexes of the type L2BeCl2 [L = benzonitrile (1), pyridine (2), 3,5-dimethylpyridine, pyrrolidine, piperidine (8), and diethylamine (10)]. Structural studies of compounds 1, 2, 8 (CHCl3), and 10 have shown that the complexes have the beryllium centers N2Cl2- tetracoordinated with a distorted tetrahedral geometry of the core unit. In crystals of 8 and 10 these molecules are associated to form helical strings via distinct N-H-Cl hydrogen bonding. The reaction of the weak donor pyrazole (pyz) with (Et2O)2BeCl2 at low temperature gives the mixed complex [(Et2O)(pyz)BeCl2] (4), in which one diethylether molecule is retained in the inner coordination sphere of the metal. In tetrahydrofuran (thf) solution, no reaction is observed with pyrazole, indicating that tetrahydrofuran is the stronger donor as compared to pyrazole, and the (thf)2BeCl2 solvate remains intact. By contrast, with the strong base pyrrolidine (pyrr) the same reaction leads to substitution of one chloride ligand to give the ionic product [(pyrr)3BeCl]+Cl−, (7). Both products (4, 7) have been structurally characterized. At room temperature the reactions with pyrazole or piperidine lead to ether cleavage as a side-reaction which may even become dominant at long reaction times and more forcing conditions. Dinuclear complexes of the type [LBeCl(μ2-OR)]2 are formed, the structures of which have also been determined. The results suggest that hydrogen bonding may assist in the ether cleavage process, since this reaction is not observed for ligands devoid of N-H functions.
Ba9[NbN4]2O[Cn2] – Synthesis, Crystal Structure and Raman Spectrum
Authors: Reckeweg Olaf , DiSalvo Francis J. 
Published: August 2018

Abstract
Red transparent single crystals of Ba9[NbN4]2O[CN2] were synthesised by the reaction of BaO coated Ba metal, C and Nb powder in arc-welded Nb ampoules at 1300 K. The title compound was characterised by X-ray single crystal diffraction (P1̅ , a = 799.05(2), b = 962.61(2) and c = 1264.38(4) pm; α = 75.859(1), β = 85.745(1) and γ = 87.8621(8)°; Z = 2) and Raman spectroscopy (νsym = 1234 and δ = 632/658/668 cm−1). It now seems likely that a nitride-azide compound we previously reported, Ba9[NbN4]2N[N3], does not exist, but is in fact the title compound.
Synthesis, Electronic Spectra and Solvent-Induced Reversible Dissociation of Diphosphine(hexafluoroacetylacetonato)copper(I) Complexes
Authors: Pawlowski Valeri , Strasser Andreas , Vogler Arnd 
Published: August 2018

The complexes CuI(P-P)(hfac) with P-P = 1,2-bis(diphenylphosphino)ethane (diphos), 1,3-bis-(diphenylphosphino)propane (prophos), 2,2’-bis(diphenylphosphino)-1,1’-binaphthyl (binap) and hfac = hexafluoroacetylacetonate were synthesized and spectroscopically characterized. In the solid state or in solutions of non-polar solvents these compounds are yellow owing to a long-wavelength (hfac− →P-P) ligand-to-ligand charge transfer absorption. In coordinating solvents such as CH3CN the complexes undergo a reversible dissociation according to the equation:
Cu(P-P)(hfac) + n CH3CN ⇌ [Cu(P-P)(CH3CN)n]+hfac−.
While the complexes are not luminescent the ion pairs [Cu(P-P)(CH3CN)n]+hfac− are emissive at 77 K. The cations and the anions show separate emissions as indicated by the excitation spectra.
Electrodeposition and Corrosion Resistance of Zn-Pd Alloy from the ZnCl2-EMIC(1-ethyl-3-methylimidazolium chloride)-PdCl2 Room Temperature Molten Salt
Authors: Hsu Hsin-Yi , Yang Chao-Chen 
Published: August 2018

Abstract
Electric conductivities of 50-50 mol% ZnCl2-EMIC and its mixtures with 0.6714 mol% PdCl2 room-temperature molten salts (RTMS) have been measured by a computerized system based on a d.c. four-probe method. The conductivity of the former is greater than that of the latter. These conductivities are well fitted by Arrhenius equations and the activation energies are calculated to be 25.22 and 26.28 kJ/mol, respectively. Cyclic voltammetry for the ZnCl2-EMIC-PdCl2 melt has been performed on Pt and Cu working electrodes. The cathodic reduction waves of Pd2+ and Zn2+ species and the oxidation waves for Zn-Pd alloys rich in Zn and Pd have been observed for the cyclic voltammograms on the Pt working electrode. The deposition potentials have been measured to be −0.7 V and −1.3 V on the Cu substrate. The morphology and composition of the electrodeposited layers obtained under different conditions have been analyzed by SEM and EDS, respectively; layers with a finer (about 300 - 500 nm), denser and higher Pd content have been obtained by pulse plating on the Cu sheet at ton/toff = 3/1 under −0.7 V at 80 °C. The XRD patterns also reveal that the structure of these deposited layers can be regarded as amorphous. Tafel polarization curves of the electrodeposited layers in 3.5 wt% NaCl solution have been drawn. The results indicate that the Zn-Pd alloy deposits have much higher corrosion resistance and protection efficiency than the Zndeposited layer; the corrosion potentials shift positively by about 700 ∼ 950 mV. Furthermore, the pulse plating has a better performance than the direct current plating, and the reason is discussed.
Azide und Cyanamide – ähnlich und doch anders/Azides and Cyanamides – Similar and Yet Different
Authors: Reckeweg Olaf , Simon Arndt 
Published: August 2018

Abstract
The crystal structures of LiN3*H2O (P63/mcm (No. 193), Z = 6; 924.01(13); 560.06(7) pm); NH4N3 (Pmna (No. 53), Z =4; a=889.78(18), b=380,67(8), c=867.35(17) pm); Ca(N3)2 (Fddd (No. 70), Z = 8; a=595.4(2), b=1103.6(5), c=1133.1(6) pm), Sr(N3)2 (Fddd (No. 70), Z =8; a= 612.02(9), b = 1154.60(18), c = 1182.62(15) pm); Ba(N3)2 (P21/m (No. 11), Z = 2; a = 544.8(1), b = 439.9(1), c = 961.3(2) pm, β = 99.64(3)°) and TlN3 (I4/mcm (No. 140), Z = 2; 618.96(9); 732.71(15) pm) have been either determined for the first time or redetermined by X-ray diffraction on single crystals. The afore mentioned compounds, AN3 (A = Na, K, Rb, Cs), M(N3)2 · 2.5 H2O (M = Mg, Zn) and the cyanamides Li2CN2, CdCN2 and CuCN2 were investigated by Raman and IR spectroscopy (KBr technique). Structural features and spectroscopic data of azides and cyanamides from this work and from literature are listed and compared.