Table 4. Polarization of σ-Bonds W–X and Hybridization at Atom X from the NBO Analysis of the Complexes W-XY (X = Ge, Sn, Pb; Y = B–Tl) at the BP86/def2-TZVPP//BP86/def2-SVP Level.

	polarization W–X		hybridization
complex	% (W)	% (X)	%s (X)	%p (X )
W-GeB	35.4	64.6	40.8	59.2
W-GeAl	39.0	61.0	10.4	88.5
W-GeGa	40.3	59.7	13.3	86.2
W-GeIn	43.8	56.2	15.7	83.9
W-GeTl	46.9	53.1	17.1	82.6
W-SnB	36.8	63.2	43.3	56.3
W-SnAl	44.7	55.3	9.4	89.5
W-SnGa	46.1	53.9	11.4	88.3
W-SnIn	48.7	51.3	11.7	88.0
W-SnTl	54.6	45.4	12.3	87.3
W-PbB	38.7	61.3	37.8	61.8
W-PbAl	45.6	54.4	7.8	91.6
W-PbGa	47.2	52.8	8.6	91.1
W-PbIn	48.4	51.6	9.3	90.3
W-PbTl	56.2	43.8	11.4	88.2