The hydridotris(3,5-dimethylpyrazolyl)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 quasi-planar conformation in the presence of included solvent (toluene) and steric hindrance from ring substitution.
In the absence of steric hindrance and include solvent the core atoms instead assume a chair conformation (see companion structure).
The solution and refinement of the inorganic complex structure are straightforward, but the included toluene is
disordered about an inversion center, is difficult to model, and, needless to say, complicates the final stages of refinement.
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(pyrazolyl)3(µ-(C6H5O)2PO2)VO]2
Structure Determination Files by FTP
Download X-ray Data Set (ladd5c.hkl)
Download X-ray Data Collection Parameters (ladd5c.p4p)
Download Final Refinement Results (ladd5c.res)
Last changed December 8, 1996
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