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Bond strength-bond length relationships for some metal-oxygen bonds

1978; Pergamon Press; Volume: 40; Issue: 2 Linguagem: Inglês

10.1016/0022-1902(78)80123-7

1878-1225

Stanley Siegel,

Chemical Thermodynamics and Molecular Structure

Examination of crystal structure data for uranyl salts has led to the development of the relation D = D(1) − K(1−1s)) where D is the bond length for bond strength s, D(1) is the bond length corresponding to unit bond strength, and K is a constant which can be obtained from bond length data. The expression is analogous to the Pauling logarithmic relationship D = D(1) − 2 k log s. It can be shown, however, that a more general form of the bond length-bond strength expression is D = A + Ks. This equation has been applied to U+6O, BO, V+5O, and Mo+6O bonds. The range of application is limited, however, to s-values near unity and greater. A similar expression D = A′ + K′s can be used to obtain D-s information for ionic bonds. For these cases, bond distances and bond strengths are also limited to a restricted range of values. The quantities A, A′, KsandK′s appear to be radii with the s-dependent terms representing perhaps a polarization quality. The statement that these may be radii is not proven, but is implied because of numerical similarity to known radii values. An empirical method is suggested for computing all bond strengths over the extended range of bond distances.