bluuebunny/crossref_metadata_2025_split huggingface dataset:
Darstellung, Eigenschaften und elektronische Raman-Spektren von Di(bromo)phthalocyaninatometallaten(III) der Eisengruppe / Synthesis, Properties and Electronic Raman Spectra of Di(bromo)phthalocyaninatometalates(III) of the Iron Group Elements
Authors: Sievertsen Svend , Schlehahn Hendrik , Homborg Heiner 
Published: February 2015

Abstract
Low spin di(bromo)phthalocyaninatometalates of tervalent iron, ruthenium and osmium ([MBr2Pc2-]-) are formed by the reaction of [FeBrPc2-] or H[MBr2Pc2-] (M = Ru, Os) with excess bromide in DMF or THF and isolated as (nBu4N)+ salts. The electronic spectra show the typical π- π*- transitions (B, Q, N region) of the Pc2- ligand together with a number of extra bands due to trip-multiplett and (Pc, Br → M)CT transitions. νs(MBr) is observed in the resonance Raman (RR) spectrum (RR enhanced for M = Fe, Ru) at 161 cm-1 (Fe), 183 cm-1 (Ru) and 192 cm-1 (Os), νas(MBr) at 251 cm-1 (Fe), 234 cm-1 (Ru) and 218 cm-1 (Os) in the FIR spectra. The RR spectra obtained by excitation at low absorbance between the B and Q region are dominated by the intraconfigurational " Γ7 →Γ 8" transition due to spin orbit splitting of the 2T2g ground state for Fe at 583 cm-1, Ru at 1026/1050 cm-1 and Os at 3131 cm-1 . In the MIR resp. NIR spectra vibronically induced transitions are observed for the Ru or Os complex.
Ligandenmangelkomplexe des Cadmiums. Synthese und spektroskopische Charakterisierung molekularer (Pentafluorphenyl)cadmium-Thiolate und die Struktur des Cubankomplexes [{Cd(C6F5)(SBut)}4] / Ligand-Deficient Complexes of Cadmium. Synthesis and Spectroscopic Characterization of Molecular Pentafluorophenyl Cadmium Thiolates and the Structure of the Cubane Complex [{Cd(C6F5)(SBut)}4]
Authors: Duhme Anne-Kathrin , Strasdeit Henry 
Published: February 2015

Abstract
In toluene, bis(pentafluorophenyl)cadmium(II) and thiols RSH (R = But, 2,4,6-Pri
3C6H2, 2,4,6-But
3C6H2) react to give soluble pentafluorophenyl cadmium thiolates [(Cd(C6F5)(SR)}n] The compounds [{Cd(C6F5)(SBut)}4] (1) ∙ 0.5 C6H5CH3, [ {Cd(C6F5)(SC6H2Pri
3-2,4,6)}n ] (2) ∙ ca. 0.25n C6H5CH3, and [{Cd(C6F5)(SC6H2But
3-2,4,6)} n] (3) ∙ ca. 0.25 n C6H5CH3 have been prepared in 65, 59 and 78% yield, respectively. 1 ∙ 0.5 C6H5CH3 crystallizes in the triclinic space group P1̄ with a = 11,635(1)Å, b = 11.583(1)Å, c = 21.480(2)Å, α = 82.12(1)°, β = 76.26(1)°, γ = 89.35(1)°, and Z = 2. 1 is a cubane-type complex with a {Cd4(μ3-SBut)4}4+ core. Each Cd atom is coordinated by three bridging thiolato ligands and one terminal C6F5 group (Cd - S 2.62 Å, Cd - C 2.15 Å (mean values)).
The central C atoms of the ButS− ligands of 1 show a remarkable low-field shift o f their 13C NMR resonance (12.3 ppm relative to the value of the free thiol). A characteristic spectral feature of (Cd(C6F5) }+ complexes is the large value of the coupling constant 2J (19F ,13C) of the ipso-C atom (1, 2: 68 Hz; 3: 67 Hz). The complexes [Cd(C6F5)(SR) + H]+, [Cd(SR)2 + H]+, and [Cd2(SR)3]+ were identified in the Cl mass spectra (iso-butane) of 2 and 3.
Das THF-9-Natriumoxy-9-borabicyclo[3.3.1]nonan-Tetramer [1] / The THF-9-Sodiooxy-9-borabicyclo[3.3.1]nonane Tetramer [1]
Authors: Köster Roland , Seidel G. , Bläser Dieter , Boese Roland 
Published: February 2015

Abstract
The thermolysis of Na[C8H14B(Et)OH] (2), prepared from 9-Et-9-BBN (1) and NaOH, leads at about 100 °C in the presence of NaHBEt3 as catalyst to ethane and the solid NaOBC8H14 (3), which crystallizes with one mole THF as the tetrameric heterocubane 4 in the triclinic space group P1̄. The lattice constants of 4 (at 120 K) are: a = 1127.7(2), b = 1179.5(2), c = 2055.9(4) pm; α = 87.06(2), β = 87.83(2), γ = 75.37(2)°. 4 contains a slightly distorted central Na4O4 cube with C8H14B and THF substituents at the oxygen and the sodium atoms respectively. 3 can also be prepared by heating an equimolar mixture of Na[H2BC8H14] (5) and Na[(HO)2BC8H14] (6), or from (9H-9-BBN)2 and NaOH and from 9-HO-9-BBN and NaH in THF.
Dimere 9-Hydrochalkogeno-9-BBN-Verbindungen - Bildung und Kristallstruktur [1] / Dimeric Hydrochalcogeno-9-BBN Compounds - Formation and Crystal Structure [1]
Authors: Köster Roland , Seidel Günter , Bläser Dieter , Boese Roland 
Published: February 2015

Abstract
The trans-dimer of (9-HS-9-BBN)2 (1)2, obtained from H2S with (9H-9-BBN)2 or with (9-BBN)2S, crystallizes in the monoclinic space group C2/m [lattice constants (at 120 K): a = 15.279(2), b = 15.909(3), c = 6.822(4) Å; β = 91.05(4)°] with a planar B2S2ring. The cis-dimer of (9-HSe-9-BBN)2 (2)2, obtained from (9-BBN)2Se with aniline, crystallizes in the monoclinic space group P21/n [lattice constants (at 225 K): a = 6.892(1), b= 20.623(3), c = 12.226(2) Å; β = 97.28°] with an folded B2Se2ring.
Gehinderte Ligandbewegungen in Übergangsmetallkomplexen, XLIII [1]: Photoreaktionen von Hexacarbonyl-μ-η5:5-fulvalen-dimolybdän und -diwolfram mit konjugierten Cyclodienen / Hindered Ligand Movements in Transition Metal Complexes, XLIII [1]: Photoreactions of Hexacarbonyl-μ-η5:5-fulvalene-dimolybdenum and -ditungsten with Conjugated Cyclodienes
Authors: Kreiter Cornelius G. , Conrad Wolfgang 
Published: February 2015

Abstract
Hexacarbonyl-μ-η5:5-fulvalene-dimolybdenum (1) reacts photochemically with 1,3-cyclopentadiene (a), and 1,3-cyclohexadiene (b) to yield the corresponding tetracarbonyl-η4-1,3-cyclodiene-μ-η5:5-fulvalene-dimolybdenum complexes 4a, 4b. With a also mixed valent tricarbonyl-η5-cyclopentadienyl-μ-η5:5-fulvalene-hydrido-dimolybdenum (3) is formed. Hexacarbonyl-μ-η5:5-fulvalene-ditungsten (2) yields with a only tricarbonyl-η5-cyclopentadienyl-μ-η5:5-fulvalene-hydrido-ditungsten (5). The η4-1,3-cyclodiene ligands in 4a, 4b are u-oriented towards fulvalene. The complexes 4a, 4b show hindered inversions with energy barriers of ΔG#
273 = 59.9 ± 2 kJ/mol (4a) and ΔG#
293, = 62.7 ± 2 kJ/mol (4b).
Synthese und Kristallstraktur von [{Cp(CO)2Fe}2Sn(F)FBF3] / Synthesis and Crystal Structure of [{Cp(CO)2Fe}2Sn(F)FBF3]
Authors: Merzweiler Kurt , Weisse Laurent , Kraus Harald 
Published: February 2015

Abstract
[{Cp(CO)2Fe}2SnCl2] reacts with AgBF4 to form [{Cp(CO)2Fe}2Sn(F)FBF3] 1.1 crystallizes in two monoclinic modifications with a = 1018.2(4), b = 1321.1(5), c = 1364.8(5) pm, β = 104.96(4)° (1a), and a = 983.1(2), b = 1760.2(6), c = 1060.4(3) pm, β = 104.28(2)° (1b). 1a and 1b contain a nearly tetrahedrally coordinated tin atom which is bonded to two {Cp(CO)2Fe} fragments, a F atom and a BF4 group.
Homoleptische 1,4-Diazadienverbindungen elektronenarmer Übergangsmetalle. Synthese, Eigenschaften und Strukturen von (DAD)2Ti und (DAD)3Ti [1] / Homoleptic 1,4-Diazadiene Compounds of Early Transition Metals. Syntheses, Properties and Structures of (DAD)2Ti and (DAD)3Ti [1]
Authors: Goddard Richard , Krüger Carl , Hadi Ghassan Abdul , Thiele Karl-Heinz , Scholz Joachim 
Published: February 2015

Syntheses and structures of homoleptic 1,4-diaza-1,3-diene (DAD) complexes of titanium are described. The spiranoid DAD complexes of formula (DAD)2Ti 3a-c are formed by reaction of TiCl4·2THF with the disodium salts Na2DAD 2a-c or by reduction of TiCl4·2TH F with magnesium in presence of two equivalents of DAD 1a-c . The endiaide complexes 3a-c are thermally stable, very sensitive to oxygen and water, and soluble in all com monorganic solvents. An X-ray crystal structure determination of 3 c reveals the titanium atom to be in a strongly distorted tetrahedral environment. The two five-membered metallacyclic

rings are folded along the N,N′ axis. Temperature-dependent 1H NMR spectra of 3a-c indicate a rapid intramolecular inversion of this non-planar ring system in solution even at room temperature.
Reduction of TiCl4·2THF with magnesium in presence of excess DAD 1d-f leads to the formation of the blue-violet complexes (DAD)3Ti 4d-f. At low temperatures three sterically crowded DAD ligands cause a rigid conformation as demonstrated by their unique lowtemperature 1H NMR spectra.
μ2-Halogenokomplexe von N-Iodsuccinimid. Die Kristallstrukturen von PPh4[X(N-Iodsuccinimid)2] · CH3CN mit X = Cl, Br, / μ2-Halogeno Complexes of N-Iodosuccinimide. The Crystal Structures of PPh4[X(N-Iodosuccinimide)2] · CH3CN with X = Cl, Br, I
Authors: Ghassemzadeh Mitra , Dehnicke Kurt , Goesmann Helmut , Fenske Dieter 
Published: February 2015

The μ2-halogeno complexes PPh4[X(N-Iodosuccinimide)2] · CH3CN with X = CL Br, I have been prepared by reactions of N-Iodosuccinimide with the corresponding tetraphenylphos- phonium halides PPh4X in acetonitrile solutions. The compounds form pale yellow crystal needles, which were characterized by IR spectroscopy and by crystal structure determinations.
PPh4[Cl(N-Iodosuccinimide)2] · CH3CN (1): Space group Pna21, Z = 4, 4461 observed unique reflections. R = 0.027. Lattice dimensions at -60 °C: a = 1840.5(9), b = 2589(1), c = 728.2(4) pm.
PPh4[Br(N-Iodosuccinimide)2] · CH3CN (2): Space group Pna21 Z = 4, 4284 observed unique reflections, R = 0.034. Lattice dimensions at -70 °C: a = 724.8(4), b = 1838.6(9), c = 2601(1) pm.
PPh4[I(N-Iodosuccinimide)2] · CH3CN (3): Space group Pna21, Z = 4, 5775 observed unique reflections. R = 0.031. Lattice dimensions at -60 °C: a = 1849.2(9). b = 2644(1), c = 730.3(4) pm.
1-3 are isotypical. There structures consist of PPh4
+ ions, including acetonitrile molecules without bonding interactions, and anions [X(iodosuccinimide)2]-, in which the halide ions X- are coordinated bv the iodine atoms of the N-iodosuccinimide molecules. The bond angles I··· X···I range from 90.13(4)° (X = Cl) and 88.84(3)° (X = Br) to 87.83(3)° (X = I). The bond angles N- I ··· X are nearly linear.
Ein gemischtvalentes Oxometallat mit Cr3+ anstelle von Ti3+: Ba2Ti4
4+Cr2O13 / A Mixed Valent Oxometallate with Cr3+ Instead of Ti3+ Ba2Ti4
4+ Cr2O13
Authors: Möhr S. , Müller-Buschbaum  
Published: February 2015

Abstract
Single crystals of Ba2Ti3+Cr2Oi3 were prepared by C02-LASER high temperature reactions and investigated by X-ray work. The compound crystallizes with monocli­nic symmetry, a = 15.0185, b = 3.9419, c = 9.0764 Å. β = 98.137°, Z = 2. Ba2Ti4Cr2O13 is isotypic to Na2Ti6O13. The crystal structure is discussed with respect to ordered or disordered distributions of Ti4+ and Cr3+ using calculations of Coulomb terms of lattice energy. It is shown, that the stability of this structure type will be decre­ased by replacement of Na+ by ions with higher oxidation states.
Metallkomplexe von Farbstoffen, V [1] Ein Triplatin(II)-Komplex mit dem Trianion von Trichinolobenzol als Tris(chelat)-Ligand / Metal Complexes of Dyes, V [1] A Trisplatinum(II) Complex with the Trianion of Triquinolobenzene as Tri(chelate) Ligand
Authors: Lenz Andreas , Polborn Kurt , Beck Wolfgang 
Published: February 2015

Abstract
The complex [(n7Bu3P)(Cl)Pt]3(triquinolobenzene-3H+) is obtained from the trisodium salt of triquinolobenzene and (nBu3P)(Cl)Pt(μ-Cl)2Pt(Cl)nBu3) and has been characterized by X-ray diffraction. The three platinum atoms are syn positioned outside of the not ideal plane of the triquinolobenzene frame.
Phasenuntersuchungen im System 2 Ha–TaS2–2Hc–MoS2 / Investigations on Phases in the System 2 Ha-TaS2-2Hc-MoS2
Authors: Remmert Peter , Fischer Edmund , Hummel Hans-Ulrich 
Published: February 2015

Ternary phases in the system TaS2-MoS2 have been obtained by thermal reactions at 1050 °C of binary layered disulfides and NH4Cl as promotor.
Ternary phases Ta1-xMoxS2 exist in the range 0.5 ≤ x ≤ 0.9. In the range of 0.25 ≤ x ≤ 0.55 the reactions are quantitative and the phase-compositions are determined by the amounts of the starting materials. For x < 0 .2 1 T-TaS2 and for x > 0.60 2 Hc-MoS2 are contaminating the resulting ternary phases.
Ternary phases have been characterized by X-ray powder diffraction and are indexed rhombohedrally on the basis of a 3 R-structure with metals in trigonal-prismatic coordination. The phases Ta1-xMoxS2 with 0.25 ≤ x ≤ 0.55 show a reversible transition of higher order associated with a change in the electrical conductivity mechanism. Below 420 K the phases show semiconductivity while above 460 K metallic conductivity is observed
Die Einlagerung von Pyridin in ternäre Übergangsmetalldisulfide Ta1-xMoxS2 / Intercalation of Pyridine into Ternary Transition Metal Disulfides Ta1-xMoxS2
Authors: Remmert Peter , Hummel Hans-Ulrich 
Published: February 2015

Abstract
Ternary phases Ta1-xMoxS2 with 0.25 ≤ x ≤ 0.55 have been investigated regarding their intercalation potential using pyridine as guest molecule. Intercalation yields hexagonal phases Ta1-xMoxS2·(pyridine)n. The different phases have been characterized by elemental analysis as well as TGA and powder diffraction patterns, which have been indexed using the space group P3m1. For the compound Ta0.65Mo0.35S2·(pyridine)0.38 a structural model was developed, based on powder diffraction data: P3m1, a = 3.275(2), c = 12.008(7)Å and Z = 1. During intercalation the stacking sequence of the host lattice is changed from BaB/AcA/CbC to BaB(pyr)/BaB(pyr). Intercalation of pyridine into Ta1-xMoxS2 proceeds via a two-step mechanism. In the first step orthorhombic phases are formed with reduced pyridine content as compared to the final intercalation product; e.g. Ta0.55Mo0.45S2·(pyridine)0.38. The first step intercalation compounds can be obtained by interruption of the intercalation reaction after 7 days.
Diinkomplexe von Wolfram(VI). Die Kristallstruktur von [(Et2S)WCl4(Me3Si-C≡C-(CH2)4-C≡C-SiMe3)WCl4(SEt2)] / Diyne Complexes of Tungsten(VI). The Crystal Structure of [(Et2S)WCl4(Me3Si-C≡ C-(CH2)4-C≡C-SiMe3)WCl4(SEt2)]
Authors: Dierkes Peter , Fenske Dieter 
Published: February 2015

Abstract
The diyne complexes [(Et2S)WCl4(R-C≡C-(CH2)n-C≡C-R)WCl4(SEt2)] (R = SiMe3, n = 3, 4, 8; R = C6H5, n = 4, 8) have been prepared by the reaction of trans-[WCl4(SEt2)2] with the corresponding diyne in toluene solutions. The complexes form green or orange, diamagnetic, moisture sensitive crystal powders, which were characterized by their IR and 13C NMR spectra. The crystal structure of the complex with R = SiMe3 and n = 4 has been determined.
[(Et2S)WCl4(Me3Si-C≡C-(CH2)4-C≡C-SiMe3)WCl4(SEt2)]: Space group P21/c, Z = 2, 3620 observed unique reflections with I > 2σ(I), R = 0.027. Lattice dimensions at -70 °C: a = 1431.8(11), b = 839.6(8), c = 1731.3(11) pm, β = 112.74(2)°. The structure consists of molecules in which both tungsten atoms are surrounded by four chlorine atoms in equatorial positions, both alkyne groups are bonded side on (η2) to the tungsten atoms, whereas the sulfur atoms of the diethylsulfide molecules are located trans to the alkyne groups.
Synthese und Struktur diastereomerer, zweikerniger Kupferkomplexe [1] / Synthesis and Structure of Diastereomerie Dinuclear Copper Complexes [1]
Authors: Saalfrank Rolf W. , Struck Oliver , Peters Karl , Schnering Hans Georg von 
Published: February 2015

Abstract
Depolymerisation of a copper(II)/pyrrolidine-based 2D -polymer 2 by 4,4′-bipyridyl [molar ratio: 2 (CuL2) : 1 (Bipy)] and recrystallisation of the reaction product leads to two visually distinguishable crystal charges, composed of dark green octahedra meso-4 and light green rod-shaped crystals racem-5. Separation of the conglomerate of the morphologically different crystals is accomplished by pick out. The structure of the dinuelear complex racem-5 has been established unambigously by X-ray structure analysis. EPR and susceptibility measurements of mixtures of complex meso-4 and racem-5 indicate that there is no interaction be­tween the two copper(II) centres.
Ein neuer Zugang zu ionischen Thionylimiden. Einkristallstruktur von N(CH3)4NSO / A New Access to Ionic Thionylimides. Single Crystal Structure of N(CH3)4NSO
Authors: Mann S. , Jansen M. 
Published: February 2015

Abstract
Single crystals of N(CH3)4NSO have been prepared via ion exchange from RbNSO or CsNSO and tetraalkylammonium halides in liquid ammonia and investigated by X-ray single crystal techniques (I4̅, a = 1137.6(1), c = 1134.9(2) pm, Z = 8, T = -100 °C). The crystal structure of N(CH3)4NSO is related to the CsCl-type of structure. Using the same preparative route NMe3BzNSO has been obtained. Its lattice powder data (orthorhombic primitive; a = 896.3(2), b = 1235.4(3), c = 1070.7(4) pm).
Direct Synthesis of Zinc and Nickel(II) Complexes with 1,4-Diazabicyclo[2.2.2]octane
Authors: Petrusenko Svitlana R. , Sieler Joachim , Kokozay Vladimir N. 
Published: February 2015

Abstract
The peculiarities of the formation of zinc and nickel(II) complexes by interaction of metal powder or metal oxide with ammonium salts (halides, nitrate, thiocyanate) were investigated in non-aqueous solutions (methanol, acetonitrile, N,N-dimethylformamide=DMF, dimethylsulfoxide=DMSO) in presence of 1,4-diazabicyclo[2.2.2]octane. The stoichiometry of the com ­ plexes was found to depend on the initial reagent ratio Ni/ZnO:NH4X and Ni/ZnO:Ten. The compounds of compositions Zn(HTen)(H2O)(NO3)3 and Ni(HTen)(Ten)Cl3 were character­ized by X-ray crystallography. Both complexes contain five-coordinate metal atoms. The zinc compound possesses monomeric molecular structure whilst the nickel complex is polymeric.
Crystal Structure of the Di-bromo-bis(2-dimethylaminoethanolato)(dimethylsulfoxide)-copper(II)-lead(II) Dimer Obtained by Direct Synthesis
Authors: Kovbasyuk Larisa A. , Vassilyeva Olga Yu. , Kokozay Vladimir N. , Linert Wolfgang 
Published: February 2015

Abstract
A heterotetranuclear CuIIPbII complex containing 2-dimethylaminoethanol has been synthesized, using copper powder and PbBn2 as starting materials, and characterized by X-ray crystallography. The crystal is composed of centrosymmetric molecules [CuPbBr2{(CH3)2NCH2CH2O}2dmso]2. The central strictly planar fragment is a Pb2O2 parallelogram completed by bridging oxygen atoms of chelating 2-dimethylaminoethoxo groups. The Pb atom forms four quite short bonds with oxygen atoms of the three 2-dimethylaminoethoxo groups and of the dmso molecule and assumes a six-coordinate structure also involving two bromine atoms. The two oxygen and two nitrogen atoms of two 2-dimethylaminoethoxo groups form the copper coordination environment, which possesses a somewhat distorted square planar geometry.
Monoheteroarylborate [1] / Monoheteroarylborates [1]
Authors: Kuhn Norbert , Kotowski Heike , Bläser Dieter , Boese Roland 
Published: February 2015

Abstract
The heteroaryl borates Li[C4Me4NBH3] (6) and Na[C3H3N2(BMe3)2]• 2 C4H8O (8) are ob­tained by treatment of Li[C4Me4N] and Na[C3H3N2] with Me2S • BH3 and BMe3, respectively. The X-ray structure of [Na(C4H8O)6][C3H3N2(BMe3)2] (10) is reported.
Synthese und Kristallstruktur eines Barium-Zink-Vanadyl-phosphats BaZn(VO)(PO4)2 mit [(VO)PO4]-Schichten / Synthesis and Crystal Structure of a Barium-Zinc-Vanadyl-Phosphate BaZn(VO)(PO4)2 Containing [(VO)PO4] Layers
Authors: Meyer S. , Müller-Buschbaum Hk. 
Published: February 2015

Abstract
Single crystals of BaZn (VO)(PO4)2 have been prepared by solid state reactions of prereacted BaCO3 and P2O5 mixtures with ZnO, V2O3 and V2O5 in evacuated quartz tubes. X-ray investigations led to orthorhombic symmetry, space group D2h
15 -Pbca, a = 8.814(1), b = 9.039(1), c = 18.538(1) A, Z = 8 . The crystal structure is characterized by layers of PO4 tetrahedra and square VO1+5 pyramids, connected by corrugated layers of PO4 and ZnO4 tetrahedra. The resulting tunnel structure is filled by Ba2+ ions. The short distance of the V4+ center to the apical oxygen atom of the square VO5 pyramids is a typical feature of vanadyl groups.
Synthese und Kristallstruktur von Hexa(tert-butyl)bismocenium-tetrachloroaluminat / Synthesis and Crystal Structure of Hexa(tert-butyl)bismocenium Tetrachloroaluminate
Authors: Sitzmann Helmut , Wolmershäuser Gotthelf 
Published: February 2015

Abstract
On chloride abstraction from chloro-bis{1,2,4-tri(tert-butyl)cyclopentadienyl}bismut(III) (2 ) with aluminum trichloride the salt [{C5H2(CMe3)3
-1,2,4}2Bi]+ AlCl4
- (1) has been obtained in good yield. The crystal structure of 1 shows a bismocenium cation with nearly parallel η5 - cyclopentadienyl rings (10.2° inclination of the best planes) and only a slight bending of the Cpcent -Bi-Cpcent axis (172.9°).
Pressure Dependence of the Electrode Potentials of Some Iron(III/II), Cobalt(III/II), and Ni(III/II) Couples in Aqueous Solution: Estimation of the Reaction Volumes for M(III)/M(II) Couples
Authors: Matsumoto Mitsuru , Tarumi Toshiyasu , Takahashi Isao , Funahashi Shigenobu , Noda Toshiaki , Takagi Hideo D. 
Published: February 2015

Abstract
Pressure dependence of the electrode potentials for various M 3+/2+ couples (M = Fe, Co, and Ni with o-phenanthroline, bipyridine, terpyridine, 1,4,7-triazacyclononane, and 1,4,7-tri-thiacyclononane) was measured by cyclic voltammetry in aqueous solution vs. a Ag/AgCl reference electrode. The reaction volume of the Ag/AgCl reference electrode was estimated from the change in the partial molar volumes of Feaq
3+/2+ and Co(terpyridine)2
3+/2+ couples, and the volumes for the formation of M2+ from M3+ were determined. The electrostrictive component for the change in the oxidation state for the M3+/2+ couple was calculated on the basis of the Drude-Nernst equation and by the mean spherical approximation (MSA). The isolated volumes for the formation of M2+ from M3+ were compared with the values predicted by theory.
Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymbromiden / Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Bromides
Authors: Hennig C. , Oppermann H. 
Published: February 2015

The thermal decomposition equilibria of ammonium neodymium bromides (NH4)3NdBr6, (NH4)2NdBr5 and NH4Nd2Br7 have been investigated by total pressure measurements. The thermodynamical data of these solid phase complexes have been derived from the decomposition functions. The standard enthalpies of solution in 4N HBr (aq.) of (NH4)3NdBr6, (NH4)2NdBr5, NH4Nd2Br7, NdBr3 and Nd2O3 were measured. On the basis of these values and tabulated data, the standard enthalpies at 298 K of the ammonium neodymium bromides were derived and compared with the results obtained from the total pressure measurements.
Data by total pressure measurement: ΔH°B((NH4)3 NdBr6,f,298) = -399,1 ± 4,9 kcal/mol; S°((NH4)3NdBr6,f,298) = 153,4 ± 7,4 cal/K.mol; ΔH°B((NH4)2NdBr5,f,298) = -343,0 ± 4,4 kcal/mol; S°((NH4)2,NdBr5,f,298) = 109,9 ± 6,8 cal/K.mol; ΔH°B(NH4Nd2Br7,f,298) = -484,0 ± 5,1 kcal/mol; S°(NH4Nd2Br7,f,298) = 127,9 ± 6,6 cal/K.mol.
Data by solution calorimetry: ΔH°B(NdBr3,f,298) = -208,7 ± 1,6 kcal/mol; ΔH°B((NH4)3- NdBr6,f,298) = -404,8 ± 2,7 kcal/mol; ΔH°B((NH4)2NdBr5,f,298) = -344,2 ± 2,4 kcal/mol; ΔH°B(NH4Nd2Br7,f,298) = -482,7 ± 3,7 kcal/mol.
Chinazolinderivate durch Cyclodehydrierung von N-(2-substituierten Aryl)-Piperidinen / Quinazoline Derivatives by Cyclodehydrogenation of N-(2-Substituted Aryl)-Piperidines
Authors: Möhrle H. , Jeandrée M. 
Published: February 2015

Dehydrogenation of the N-[2-(aminocarbonyl)phenyl]piperidines 1 -5 using Hg(II)-EDTA, generated the quinazolinones 6 -9 . Increasing size of the 4-substituent in the piperidine decreased the oxidation rate and the product yield.
N-[2-(Hydroxyiminomethyl)phenyl]piperidines 18-22 showed a different behaviour. While 18 with H g(II)-EDTA in water produced the oxime lactam 24 in quantitative yield, the 4- substituted piperidines 19-21 caused not only a lower reaction rate but also an altered product pattern. The double dehydrogenation to lactams was reduced and the cyclic nitrones, formed by two electron withdrawal, became dominant. From the spiro compounds 21 and 22, solely the quinazoline-N-oxides 29 and 30 resulted. The mechanism of the reactions is discussed.