| | 2 | Author
| UlrichW. Annagat, Gabriele Bogedain, A. Drian Schervan, HeinrichC M Arsm Ann, DavidJ. Brauer, Hans Bürger, FrankD. Örrenbach, Gottfried Pawelke, Carl Krüger, Karl-Heinz Claus | Requires cookie* | | | Title
| Das Isosterenpaar S iO /P N , I Zur Isosterie von Perchlorcyclosiloxanen und Perchlorcyclophosphazenen. Schwingungsspektren und Röntgenstrukturanalyse von (Cl2SiO )3 und (Cl2SiO )4 The SiO/PN Isoelectronic Pair, I Perchlorocyclosiloxanes and Perchlorocyclophosphazenes. Vibrational Spectra and X-Ray Structure Analysis o f (Cl2SiO) 3 and (Cl2SiO) 4  | | | | Abstract
| Hexachlorocyclotrisiloxane (2) and octachlorocyclotetrasiloxane (4) were prepared by reac tion o f SiCl4 with 0 2 at 955 C. Their mass spectra are compared with those o f the isoelectronic cyclophosphazenes. The vibrational spectra o f 2 and 4 are very similar and closely related to that o f (PNC12)3, but clearly different from that o f the puckered (PNCU) 4 molecule. The X-ray examination o f 2 and 4 reveals planarity o f the (SiO)", n = 3 and 4 ring systems, with d (S i-O) on average 1.619(4) and 1.584(3) Ä, respectively. | | | |
Reference
| Z. Naturforsch. 46b, 931—9 (1991); eingegangen am 2. Novem ber 1990 | | | |
Published
| 1991 | | | |
Keywords
| Perchlorocyclosiloxanes, Perchlorocyclophosphazenes, Isoelectronic Relations, X-Ray, Vibrational Spectra | | | |
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| default:Reihe_B/46/ZNB-1991-46b-0931.pdf | | | | Identifier
| ZNB-1991-46b-0931 | | | | Volume
| 46 | |
| 3 | Author
| Eberhard Bessler, BrowdoM. Arins Barbosa, Wolfgang Hiller, Johann Weidlein | Requires cookie* | | | Title
| Synthese und Eigenschaften von Tetrakis(trimethylsilylisocyanid)nickel(0), N i(C = N -S iM e 3)4 Synthesis and Properties of Tetrakis(trimethylsilylisocyanide)nickel(0), N i(C = N -S iM e 3)4 | | | | Abstract
| Ni(CNSiMe3)4 (Me = CH,), the first homoleptic isocyanosilane complex, has been prepared by reaction of bis(1,5-cyclooctadiene)nickel(0) with trimethylcyanosilane in ether and charac terized by its infrared, Raman spectra, ,3C NMR spectra. | | | |
Reference
| Z. Naturforsch. 46b, 490—494 (1991); eingegangen am 8. November 1990 | | | |
Published
| 1991 | | | |
Keywords
| Tetrakis(trimethylsilylisocyanide)nickcl(0), Synthesis, Vibrational Spectra, 13C NMR Spectra | | | |
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| default:Reihe_B/46/ZNB-1991-46b-0490.pdf | | | | Identifier
| ZNB-1991-46b-0490 | | | | Volume
| 46 | |
| 4 | Author
| J. Skowronek, W. Preetz, S. M. Jessen | Requires cookie* | | | Title
| Darstellung, Schwingungsspektren und Normalkoordinatenanalyse der Acetatochloroditechnetate(III) | | | | Abstract
| , cis-T ^ C ^ C C F ^ C ^ I^ (L = axiale Donorbase) sowie Kristallstruktur von a s-T c2(0 2CCH3)2Cl4((CH3)2NC0CH3)2 Preparation, Vibrational Spectra and Norm al C oordinate Analysis o f Acetatochloroditechnetates(III), c« -T c2(0 2C CH 3)2C14L2 (L = Axial Donorbase) and the Crystal Structure of ds-Tc2(0 2C CH 3)2Cl4((CFI3)2N C 0C FI3)2 Tc2(0 2C C H 3),C l4(H 20)2 has been prepared by reaction o f [Tc2C18]2" with acetic anhydride and fluoroboric acid. By treatment with the donor bases L = N ,N-dim ethylform am ide (D M F), N ,N-dim ethylacetam ide (D M A A), dimethylsulfoxide (D M SO), triphenylphosphin-oxide (TPO) and pyridine (Py), the green adducts Tc2(0 2CCH3)2Cl4L2 are formed. The structure o f T c,(O .C C H 3),C l4(D M A A), was determined by X-ray diffraction; space group C 2/c with a = 29.604(4), b = 10.895(2), c = 14.404(2) Ä, ß = 97.87(2)°, Z = 8, /?w = 2.7% . The T c -T c distance is 2.1835(7) Ä , the bridging acetate groups are in c/s-positions. The IR and Raman spectra have been recorded at 80 K and assigned according to point group C-,v, supported by a normal coordinate analysis o f Tc2(0 2C C H 3)2C14(D M A A)2 based on a general valence force field. The stretching interaction constant fd(TcTc) is determined to 3.38 m dyn/Ä. With in creasing donor strength o f the axial ligands, the intense Raman vibration v(TcTc), showing up to three overtones, is lowered from 311 to 282 cm *1. The <5-<5* transitions o f all adducts are observed at 6 4 8 -6 5 2 nm. | | | |
Reference
| Z. Naturforsch. 46b, 1305—1314 (1991); eingegangen am 4. März 1991 | | | |
Published
| 1991 | | | |
Keywords
| Diacetatotetrachloroditechnetate(III) Adducts, Synthesis, Crystal Structure, Vibrational Spectra, Normal Coordinate Analysis | | | |
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| default:Reihe_B/46/ZNB-1991-46b-1305.pdf | | | | Identifier
| ZNB-1991-46b-1305 | | | | Volume
| 46 | |
| 5 | Author
| W. Preetz, A. Wendt | Requires cookie* | | | Title
| Darstellung, Schwingungsspektren und Normalkoordinatenanalyse der Chloro-Bromo-Technetate(IV), ITcCl^B^.J2-, n = 0 -6 | | | | Abstract
| The mixed chloro-brom o-technetates(IV), [TcCl"Br6_J2_, n = 1 -5 , have been separated for the first time by ion exchange chromatography on diethylaminoethyl-cellulose. Due to the stronger trans-effect o f Br as compared to Cl, the ligand exchange reactions o f [TcBr6]2" with HC1 and o f [TcClJ2-with HBr proceed stereospecifically, to form either cis/fac-or trans/mer-species for n = 2, 3, 4, respectively. To avoid photoisom erization the com pounds have to be handled in the absence o f light. The IR and Raman spectra o f the ten chloro-bromo-techne-tates(IV), including the pure geometrical isomers, have been recorded at low temperature (80 K) and completely assigned to structures o f point groups O h, D 4h, C4v, C3v, and C2v, sup ported by normal coordinate analysis based on a general valence force field. Due to the differ ent /ra«s-influences C l< Br in asymmetric C l'-T c -B r ' axes, the T c -B r ' bonds are strength ened and the T c -C l' bonds are weakened, as indicated by valence force constants, for T c -Br' on average 6% higher and for T c -C l' 10% lower, as compared with the values calculated for symmetric Br—T c— Br and C l-T c —Cl axes, respectively. | | | |
Reference
| Z. Naturforsch. 46b, 1496—1502 (1991); eingegangen am 15. Mai 1991 | | | |
Published
| 1991 | | | |
Keywords
| Chloro-Bromo-Technetates(IV), Stereoisomers, /ra«s-Effect, /ra«5-Influence, Vibrational Spectra | | | |
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| default:Reihe_B/46/ZNB-1991-46b-1496.pdf | | | | Identifier
| ZNB-1991-46b-1496 | | | | Volume
| 46 | |
| 6 | Author
| W. Preetz, A. Wendt | Requires cookie* | | | Title
| Darstellung, Schwingungsspektren und Normalkoordinatenanalyse der Chloro-Bromo-Technetate(IV), ITcCl^B^.J2-, n = 0 -6 | | | | Abstract
| The mixed chloro-brom o-technetates(IV), [TcCl"Br6_J2_, n = 1 -5 , have been separated for the first time by ion exchange chromatography on diethylaminoethyl-cellulose. Due to the stronger trans-effect o f Br as compared to Cl, the ligand exchange reactions o f [TcBr6]2" with HC1 and o f [TcClJ2-with HBr proceed stereospecifically, to form either cis/fac-or trans/mer-species for n = 2, 3, 4, respectively. To avoid photoisom erization the com pounds have to be handled in the absence o f light. The IR and Raman spectra o f the ten chloro-bromo-techne-tates(IV), including the pure geometrical isomers, have been recorded at low temperature (80 K) and completely assigned to structures o f point groups O h, D 4h, C4v, C3v, and C2v, sup ported by normal coordinate analysis based on a general valence force field. Due to the differ ent /ra«s-influences C l< Br in asymmetric C l'-T c -B r ' axes, the T c -B r ' bonds are strength ened and the T c -C l' bonds are weakened, as indicated by valence force constants, for T c -Br' on average 6% higher and for T c -C l' 10% lower, as compared with the values calculated for symmetric Br—T c— Br and C l-T c —Cl axes, respectively. | | | |
Reference
| Z. Naturforsch. 46b, 14961—1502 (1991); eingegangen am 15. Mai 1991 | | | |
Published
| 1991 | | | |
Keywords
| Chloro-Bromo-Technetates(IV), Stereoisomers, /ra«s-Effect, /ra«5-Influence, Vibrational Spectra | | | |
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| default:Reihe_B/46/ZNB-1991-46b-1496_A1b.pdf | | | | Identifier
| ZNB-1991-46b-1496_A1b | | | | Volume
| 46 | |
| 7 | Author
| M. Ohsen, Safarpour Haghighi, Heiner Homborg | Requires cookie* | | | Title
| Darstellung und Eigenschaften von Bis(phthalocyaninato)lanthanaten und -ceraten Preparation and Properties o f Bis(phthalocyaninato)lanthanates and -cerates | | | | Abstract
| High yields of bisphthalocyaninates of lanthanum and cerium have been obtained in the strongly exothermic reaction of the dehydrated lanthanoid acetates with molten 1,2-di-cyanobenzene in the presence of potassium hydroxide or methylate. Salts of the type (cat)[M(Pc(2-))-,] (M = La, Ce) with different cations (cat+ = K. Bu4N, PNP. TDOA) have been isolated. The corresponding "Hydrogen salts" are obtained by thermal decomposition of (Bu4N)[M(Pc(2-))-,] at T > 350 C. The dimeric structure is confirmed by negative fast atom bombardement mass spectra. The redox properties have been investigated by cyclovoltam-metry and UV, VIS, MIR, FIR and resonance Raman (RR) spectra are reported. Electronic transitions between 2000 and 3000 cm 1 are observed in the low temperature RR spectra of (Bu4N)[Ce(Pc(2-))^] being RR enhanced at 470 nm. From the assignment to the higher transi tions within the symmetry split 5F5/2, :F7 manifolds of the f1 ground state of Ce3+ the crystal field parameters f4f = 610.5, B40 = 242.2 and B60 = 4.1 cm-1 have been determined. | | | |
Reference
| Z. Naturforsch. 46b, 1641—1649 (1991); eingegangen am 18. Juni 1991 | | | |
Published
| 1991 | | | |
Keywords
| Bis(phthalocyaninato)lanthanates Bis(phthalocyaninato)cerates, Vibrational Spectra, UV-VIS Spectra, Electronic Raman Spectra | | | |
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| default:Reihe_B/46/ZNB-1991-46b-1641.pdf | | | | Identifier
| ZNB-1991-46b-1641 | | | | Volume
| 46 | |
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