Simple General Method of Generating Non-oxo, Non-amavadine Model Octacoordinated Vanadium(IV) Complexes of Some Tetradentate ONNO Chelating Ligands from Various Oxovanadium(IV/V) Compounds and Structu

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• 作者：Manas Sutradhar ; Gurunath Mukherjee ; Michael G. B. Drew ; Saktiprosad Ghosh
• 刊名：Inorganic Chemistry
• 出版年：2007
• 出版时间：June 11, 2007
• 年：2007
• 卷：46
• 期：12
• 页码：5069 - 5075
• 全文大小：120K
• 年卷期：v.46,no.12(June 11, 2007)
• ISSN：1520-510X

文摘

A simple general route of obtaining very stable octacoordinated non-oxovanadium(IV) complexes of the generalformula VL₂ (where H₂L is a tetradentate ONNO donor) is presented. Six such complexes (1-6) are adequatelycharacterized by elemental analysis, mass spectrometry, and various spectroscopic techniques. One of thesecompounds (1) has been structurally characterized. The molecule has crystallographic ges/entities/fourmacr.gif"> symmetry and has adodecahedral structure existing in a tetragonal space group Pges/entities/fourmacr.gif">n2. The non-oxo character and VL₂ stoichiometryfor all of the complexes are established from analytical and mass spectrometric data. In addition, the non-oxocharacter is clearly indicated by the complete absence of the strong ges/gifchars/nu.gif" BORDER=0 >_V=O band in the 925-1025 cm^-1 region,which is a signature of all oxovanadium species. The complexes are quite stable in open air in the solid state andin solution, a phenomenon rarely observed in non-oxovanadium(IV) or bare vanadium(IV) complexes.