The hydridotris(pyrazolyl)borate capped vanadyl centers have only two open coordination sites. When
combined with the bidentate diphenylphosphate bridging ligand, a series of divanadyl complexes is produced.
The dinuclear complex possesses inversion symmetry with only half of the complex unique. The bridging ring
at the core of the structure exhibits great conformational flexibility, adopting a variety of conformations in
response to different steric or crystal packing forces in different structures. Here the core atoms of the
divanadyl complex assume a chair conformation in the absence of included solvent and steric hindrance.
Increased steric hindrance, through methyl group substitution on the pyrazole ring (see companion structure),
or packing forces, through solvent inclusion, produce flattened and distorted conformations of the core atoms.
In spite of the large numbers of atoms in the structure and the potential for disorder in the terminal
phenyl groups, the solution of this structure is quite straightforward and the refinement is well-behaved.
Literature reference: Bond, M. R., Carrano, C. J., Mokry, L. M., Otieno, T.,
and Thompson, J. "Three New Polynuclear, Di-mu-phosphato Vanadyl Clusters:
[HB(pz)3VO(µ-(C6H5O)2PO2)]2,
[HB(3,5- Me2pz)3VO(µ-(C6H5O)2PO2)]2.C7H8, and
H2O.[t-Bupz(µ-C6H5OPO3)VO]6.2CH3CH2OH.
Adaptability of the Cyclic (OV)(OPO)2(VO) Bridging Unit" Inorg. Chem. 1995, 34, 1894-1905.
Companion Structure: [HB(3,5- Me2pyrazolyl)3VO(µ-(C6H5O)2PO2)]2.C7H8
Structure Determination Files by FTP
Download X-ray Data Set (lm6.hkl)
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Download Final Refinement Results (lm6.res)
Last changed December 7, 1996
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