Synthesis and structural characterization of group 5 dimetallaheteroboranes

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• 作者：Pritam Shankhari ; Dipak Kumar Roy ; K. Geetharani ; R.S. Anju ; Babu Varghese ; Sundargopal Ghosh
• 关键词：Chalcogen ; Metallaboranes ; Selenium ; Tellurium ; Vanadium
• 刊名：Journal of Organometallic Chemistry
• 出版年：1 December, 2013
• 年：2013
• 卷：747
• 期：Complete
• 页码：249-253
• 全文大小：796 K

文摘

Treatment of group 5 metal polychlorides such as [Cp_nMCl_4鈭?em>x] (M聽=聽Nb: n聽=聽1, x聽=聽0; M聽=聽V: n, x聽=聽2), (Cp聽=聽畏⁵鈭扖₅H₅) with [LiBH₄路THF] followed by thermolysis in presence of diphenyl dichalcogenide ligands, E₂Ph₂ (E聽=聽Se or Te) yielded dimetallaheteroborane clusters [(CpNb)₂BH(Se)₄], 1 and [(CpV)₂B₃H₉(渭₃-Te)], 2 in modest yields. Compound 1 can be considered as an edge fused cluster in which a trigonal bipyramidal unit [Nb₂Se₂B] has been fused with a tetrahedral core [Nb₂Se₂] by means of a common [Nb₂] edge. Compound 2 can be described as a dimetallaheteroborane built from two edge-fused V₂B₂ tetrahedra, in which one of the BH₃ units is replaced by an isoelectronic Te ligand. All the compounds have been characterized by mass spectrometry, ¹H, ¹¹B, ¹³C, ⁵¹V and ⁷⁷Se NMR spectroscopy. In addition the geometry of compound 1 has been established by crystallographic analysis.