Brunner, Henri and Kubicki, Marek M. and Leblanc, Jean-Claude and Meier, Walter and Moise, Claude and Sadorge, Andre and Stubenhofer, Bernhard and Wachter, Joachim and Wanninger, Robert (1999) Metallocenes of Nb and Ta with eta(2)-Se2H, SeH, and Se ligands - Crystal structures of [Cp ' Ta-2(SeH)H-2] and [Cp ' Ta-2(=Se)H center dot W(CO)(5)] (Cp '=tBuC(5)H(4)). EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (5). pp. 843-848. ISSN 1434-1948,
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The reactions of [(Cp2NbBH4)-Nb-#] (1) [Cp-# = C5Me5 (Cp*) or C5Me4Et] and [Cp'2TaH3] (Cp' = tBuC(5)H(4)) with elemental selenium give complexes of the general composition [Cp2MSe2H]. These exist in three isomeric forms, A-C, depending on the metal and the chalcogen. [(Cp2NbSe2H)-Nb-#] (2) incorporates the novel eta(2)-Se2H ligand (C), which is labile when exposed to light. Solutions of 2(Cp') can be converted into [Cp*2NbSe2H] (3), which exists in two isomeric forms A or B, along with [Cp*2NbSe3H] (4) and [Cp*2NbO2H] (5). [Cp'Ta-2(eta(2)-Se-2)H] (6) is the only isomer found for the Ta system. Se abstraction by means of P(OEt)(3) gives [Cp'Ta-2(= Se)H] (7). Complex 7 can be reduced with Na/Hg and subsequently hydrolysed to give [Cp'Ta-2(SeH)H-2] (8), which has also been observed during the formation of 6. Coordination of [W(CO)(5)THF] at the Se lone pair of 7 affords the heterobimetallic complex 9. All compounds have been characterized by means of 1H- and, in some cases, Se-77-NMR spectroscopy. Products 8 and 9 have also been subjected to X-ray diffraction analysis.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HETEROBIMETALLIC COMPLEXES; NIOBOCENE LIGANDS; REACTIVITY; CHEMISTRY; ZIRCONIUM; SULFUR; DERIVATIVES; TELLURIUM; CARBONYL; HYDRIDE; metallocenes; hydroselenide ligands; selenium; Se coordination chemistry |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Arbeitskreis Dr. Joachim Wachter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 Oct 2022 07:09 |
| Last Modified: | 25 Oct 2022 07:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/48271 |
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