ZfN: Search Results

1	Author	Z. A. Fokina, V. I. Pekhnyo, S. V. Volkov, V. F. Lapko, Y. V. Bryukhova, S. I. Kuznetsov	Requires cookie*
	Title	Cl NQR Spectra of Some New Iridium Chlorochalcogenide Complexes
	Abstract	The 35C1 N Q R spectra of the chlorochalcogenide complexes of iridium (SC13)2 [IrCl6] 1, (TeCl3)2 [IrCl6] 2, (SeCl3) [IrCl6] 3, [IrC l^ S C l,)^ 4, (SC13) [IrCl4(SCl2)2] 5 and [IrCl3(SeCl2)2]2 6 have been studied. The spectra were recorded by pulse spectrometry. They consist of two mul tiplets, widely separated in frequency. The high-frequency multiplet belongs to the chlorine atom s bonded to sulfur, selenium and tellurium, respectively, in the ligand. A high-frequency shift is observed, which is typical for the coordination of the molecules AC12(A = S, Se) and AC14(A = S, Se, Te). The low frequencies in the multiplets o f 4 and 6 are attributed to addition al bonds formed between chalcogen atom and chlorine in the coordination environment of iridium. In the spectral region 18-24 MHz lie the N Q R frequencies of 35C1 bonded to iridium. For 2 the frequencies are close to those of [IrCl6]2-, which confirms the Ir oxidation state IV. The unexpectedly high frequencies for Ir111 in the case of 4 and 5 are explained by the influence of AC12 molecules, which are weaker er-donors than the chloro ligands. This prom otes electron density transfer from neighbouring chlorine atoms. The 18 M Hz frequency is assigned to the bridge chlorine atoms in dimeric molecule 4. This assignment is confirmed by the positive value of d v /d T = +0,2.
	Reference	Z. Naturforsch. 48b, 986—990 (1993); received July 14 1992
	Published	1993
	Keywords	Iridium (III, IV ), Chlorochalcogenide Complexes, Synthesis, N Q R Spectra
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	TEI-XML for	default:Reihe_B/48/ZNB-1993-48b-0986.pdf
	Identifier	ZNB-1993-48b-0986
	Volume	48

2	Author	H. Hillebrecht, G. Thiele, P. Hollm, Ann, W. Preetz	Requires cookie*
	Title	Darstellung, Charakterisierung und Normalkoordinatenanalyse von gemischtvalentem Dodekabromotriplatinat(IV,II,IV) [Pt3Br12]2~ und Kristallstruktur von (Ph3P =N =P P h3)2[Pt3Br12] * 2 CH2C12 Preparation, Characterization and Norm al Coordinate Analysis o f the Mixed Valence Dodecabrom otriplatinat(IV ,II,IV ) [Pt3Br12]2~ and Crystal Structure of (Ph3P = N = PPh3)2[Pt3Br 12] * 2 C H 2C12
	Abstract	Heating a mixture (2:1) o f the tetrabutylammonium salts (TBA^JPtBrJ and (T B A)2[PtBr4] with trifluoroacetic acid leads to the mixed valence dodecabromotriplatinate(IV,II,IV) (T B A)2[Pt3Br12], The X-ray structure determination o f (Ph3P = N = PPh3)2[Pt3Br12] • 2C H 2C12 (triclinic, P 1, Z = 1) shows trinuclear groups with nearly D 2h symmetry for the anions, formed o f two PtBr6 octahedra and one planar PtBr4 group sharing edges. U sing the structural data a normal coordinate analysis based on a general valence force field for [Pt3Br12]2-has been per formed, which gives good agreement o f the calculated frequencies with the bands observed in the IR and Raman spectra.
	Reference	Z. Naturforsch. 47b, 1099—1104 (1992); eingegangen am 10. Februar 1992
	Published	1992
	Keywords	Dodecabrom otriplatinate(IV, II, IV), M ixed-Valence C om pound, Synthesis, Crystal Structure, Raman Spectra
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	TEI-XML for	default:Reihe_B/47/ZNB-1992-47b-1099.pdf
	Identifier	ZNB-1992-47b-1099
	Volume	47

3	Author	Fritz Preuss, M. Artina, Steidel, Reiner Exner	Requires cookie*
	Title	Tris(te/*f-butoxo)silylthiolato-Komplexe des Vanadiums(V, IV, III) Tris(/<?r?-butoxo)silylthiolato Complexes of Vanadium(V, IV, III)
	Abstract	Tris(te/7-butoxo)silylthiolato Com plexes o f Vanadium(V.
	Reference	Z. Naturforsch. 45b, 1618—1624 (1990); eingegangen am 17. Mai 1990
	Published	1990
	Keywords	IV, III), Preparation, N M R Spectra, ESR Spectra, X-Ray Structure Determination
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	TEI-XML for	default:Reihe_B/45/ZNB-1990-45b-1618.pdf
	Identifier	ZNB-1990-45b-1618
	Volume	45