ZfN: Search Results

1	Author	Lothar Weber, Georg Meine, Roland Boese, Norbert Niederprüm	Requires cookie*
	Title	Übergangsmetall-substituierte Diphosphene, XIV [1]
	Abstract	Zur Reaktivität des Diphosphenylkomplexes (i/ 5 -C 5 Me5)(CO) 2 Fe—P=P—Ar (Ar = 2,4,6-r-Bu 3 C 6 H 2) gegenüber Schwefel, Selen und Tellur. Synthese und Struktur des ersten Thioxo-A s -diphosphenyl-Komplexes (!7 5 -C 5 Me 5)(CO) 2 Fe-P(=S)(=P-Ar) Transition Metal Substituted Diphosphenes, XIV [1] On the Reactivity of the Diphosphenyl Complex (?; ; '-C5Me5)(CO) 2 Fe-P=P-Ar (Ar = 2,4,6-J-Bu 3 C 6 H 2) towards Sulfur, Selenium, and Tellurium. Synthesis and X-Ray Structure Analysis of the First Thioxo-A 5 -diphosphenyl Complex (>/ 5 -C 5 Me 5) (CO) 2 Fe -P(=S)(=P -Ar) The diphosphenyl complex (?7 5 -C 5 Me 5)(CO) 2 Fe-P=P-Ar (la) (Ar = 2,4,6-rm-Bu 3 C 6 H 2) reacts with an equimolar amount of sulfur to yield the first thioxo-A 5 -diphosphenyl com-plex (/7 5 -C 5 Me 5)(CO) 2 Fe-P(= S) = P-Ar (2). Heating of 2 in boiling benzene affords the metal functionalized thiadiphosphirane 3. Similarily the selenoxo-A 5 -diphosphenyl complex (^ 5 -C 5 Me 5)(CO) 2 Fe —P(=Se) = P—Ar (5) and selena-diphosphirane 6 are synthesized. The prod-ucts have been characterized by elemental analysis as well as by spectroscopic data (IR, 'H, 13 C, 31 P NMR, MS). The molecular structure of 2 has been elucidated by single crystal X-ray analysis.
	Reference	Z. Naturforsch. 43b, 715—721 (1988); eingegangen am 26. Oktober 1987
	Published	1988
	Keywords	Diphosphenyl Complex, Sulfur, Selenium, Tellurium, X-Ray Analysis
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	TEI-XML for	default:Reihe_B/43/ZNB-1988-43b-0715.pdf
	Identifier	ZNB-1988-43b-0715
	Volume	43

2	Author	H. Erbert Schumann, H. Om, Kucht, Andreas Kucht, F. Rank, H. Görlitz, Andreas Dietrich	Requires cookie*
	Title	T etramethylcyclopentadienylindium(I) und Tetramethylcyclopentadienylthallium(I): Synthese, Charakterisierung und Röntgenstrukturanalyse Tetramethylcyclopentadienylindium(I) and Tetramethylcyclopentadienylthallium(I): Synthesis, C haracterization and X-Ray Structural Analysis
	Abstract	Tetramethylcyclopentadienyllithium was reacted with InCl to form [C5H M e4]In (1). [C5H M e4]Tl (2) was prepared from tetramethylcyclopentadiene and T10C2H 5. The 'H and 13C N M R spectra o f the new com pounds as well as the X-ray crystal structures of the polymeric metallocenes 1 and 2 are reported and discussed in relation to the structures o f other cyclo-pentadienylindium(I) and -thallium(I) compounds.
	Reference	Z. Naturforsch. 47b, 1241—1248 (1992); eingegangen am 13. Februar 1992
	Published	1992
	Keywords	Indium(I) Com pounds, Thallium(I) Compounds, Tetramethylcyclopentadienyl Metal Complexes, X-Ray Analysis
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	TEI-XML for	default:Reihe_B/47/ZNB-1992-47b-1241.pdf
	Identifier	ZNB-1992-47b-1241
	Volume	47

3	Author	Hiromitsu Terao, Tsutomu Okuda, Sachiyo Uyama, Hisao Negita, Shi-Qi Dou, Hartmut Fuess, Alarich Weiss	Requires cookie*
	Title	Crystal Structure Refinement and Single Crystal 81 Br Zeeman NQR Study of KHgBr 3 H 2 0
	Abstract	Three 81 Br NQR resonance lines of KHgBr 3 H 2 0 were detected between 77 K and room temperature. From the Zeeman effect measurement on a single crystal the nuclear quadrupole coupling constants (e 2 qQ/h) and the asymmetry parameters (r/) were obtained, which are 228.42 MHz and 0.005, 226.24 MHz and 0.005, and 108.76 MHz and 0.465 for e'qQIh and rj at 295 K, respectively. Large deviations of the observed directions of electric field gradient tensors from the directions expected from previous X-ray results have been found. With the present X-ray redetermination, 1 Br NQR and structure are in good agreement. The structure and bonding in the compound are discussed.
	Reference	Z. Naturforsch. 51a, 1197—1202 (1996); received June 14 1996
	Published	1996
	Keywords	KHgBr v H 2 0, X-Ray analysis, NQR, Crystal structure, Chemical bonding
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	TEI-XML for	default:Reihe_A/51/ZNA-1996-51a-1197.pdf
	Identifier	ZNA-1996-51a-1197
	Volume	51

4	Author	Hiromitsu Terao, Masao Hashimoto\, Tsutomu Okuda, Alarich Weiss	Requires cookie*
	Title	Phase Transitions and Crystal Structure of Dimethylammonium Tribromomercurate(II), (CH 3 ) 2 NH 2 HgBr 3 , as Studied by 81 Br NQR and Single Crystal X-ray Diffraction
	Abstract	The temperature dependence of the 81 Br NQR frequencies of the title compound has revealed the presence of three phases (I, II and III, in the order of decreasing temperature): T cl (II -1) = (318 ± 10) K and T c2 (III -II) = (202 ± 1) K. The transitions were confirmed by thermal analysis (DTA). Both of the II-I and I-II transitions exhibited strong hysteresis (/. e., superheating and supercooling, respectively). The crystal data, determined by single crystal X-ray diffraction, are: monoclinic, space group P2/a, a = 1384.8(3), b = 934.7(4), c = 1452.0(2) pm, ß = 104.10(1)°, Z= 8, R = 0.076. The crystal has two crystallographically independent cations (CH 3) 2 NH 2 + and an infinite chain of anions almost in the c-direction. The anion chain is considered to consist of a HgBr 2 molecule and two different HgBr 4 2 ~ anions which are interconnected via weak intermolecular Hg-Br bonds. The splitting patterns of the 8 'Br NQR spectra indicate that rearrangements of the Hg-Br bonds are slight at the III-II transition but serious at the II-I transition. Some of the 81 Br NQR lines show anomalous temperature coefficients, attributable probably to thermal motions of cations.
	Reference	Z. Naturforsch. 53a, 559—567 (1998); received January 26 1998
	Published	1998
	Keywords	(CH 3 ) 2 NH 2 HgBr 3, X-Ray Analysis, NQR, Phase Transition, Crystal Structure
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	TEI-XML for	default:Reihe_A/53/ZNA-1998-53a-0559.pdf
	Identifier	ZNA-1998-53a-0559
	Volume	53