CHEM 324 Lecture Notes - Lecture 6: Sigma Bond, Valence Electron, Lone Pair
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20 Sep 2016
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5b-1 don"t tend to be so antibonding that they break bonds two avours: d-electrons, sigma bonds from ligands. Number of m-l bonding mos= number of ligands. In most cases 18e allows population of bonding/weakly anti bonding d-based orbitals. Stable transition metal complexes tend to have a total of 18 valence electrons associated with the transition metal. Exceptions: complexes of early transition metals (not enough d-electrons) Ticl4(thf)2: late transition metals (too many d-electrons), particularly with weak sigma donors (more on this in a bit) 1: square planar complexes these obey the 16 electron rule. Note that we use the (cid:862)io(cid:374)i(cid:272)(cid:863) (cid:373)odel of m-l bonding, where formally anionic ligands are two- electron donors (this is the model where we emphasize polar nature of the m-l bond). There is an alternative model for counting (mentioned in 24. 3) in which m-l bonds are broken homolytically. L is a donor (and still a donor)
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