Sutradhar Manas, Mukherjee Gurunath, Drew Michael G B, Ghosh Saktiprosad
Department of Chemistry, University of Calcutta, University College of Science, 92 Acharya Prafulla Chandra Road, Kolkata 700 009, India.
Inorg Chem. 2007 Jun 11;46(12):5069-75. doi: 10.1021/ic062242r. Epub 2007 May 17.
A simple general route of obtaining very stable octacoordinated non-oxovanadium(IV) complexes of the general formula VL2 (where H2L is a tetradentate ONNO donor) is presented. Six such complexes (1-6) are adequately characterized by elemental analysis, mass spectrometry, and various spectroscopic techniques. One of these compounds (1) has been structurally characterized. The molecule has crystallographic symmetry and has a dodecahedral structure existing in a tetragonal space group Pn2. The non-oxo character and VL2 stoichiometry for all of the complexes are established from analytical and mass spectrometric data. In addition, the non-oxo character is clearly indicated by the complete absence of the strong nuV=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 and in solution, a phenomenon rarely observed in non-oxovanadium(IV) or bare vanadium(IV) complexes.
