Polarizabilities hydride dipoles

Dipole polarizabilities for hydrides containing two first-row atoms reveal an interesting pattern [82]. The a values of these molecules tend to follow those of the AH molecules in the following sense. The a value of a given ABH molecule is well estimated (to within about 15%) by the sum of the a values for the A and B simple hydrides, diminished by about 6 a.u. if there is a double bond between A and B, or diminished by about 12 a.u. if there is a triple bond ... 

Table 5.5 The paraUer dipole polarizability (a) of the coinage metal hydrides from nonrelativistic (NR) and relativistic (DK) valence CASSCF calculations...

Anisotropy in the Rg-HX system (Rg = rare gas, X = F, Cl) is largely determined by the R induction term, involving the dipole polarizability of the rare gas atom and the dipole and quadrupole moments of the hydride molecule [80]. The corresponding dispersion term, involving frequency-dependent polarizabilities, gives further stabilization to the H-bonding in these complexes. 

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