Dennison D.M.'s A Proposed Experiment on the Nature of Light PDF

By Dennison D.M.

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They all show essentially the same structure. 5 skeletal electron pairs for the monoanions and 9 pairs for the dianions, whereas a bicapped tetrahedral structure (or monocapped trigonal bipyramid) would be satisfied with six pairs. An alternative view is to consider the molecules as nido-pentagonal bipyramids that should have eight pairs, but this view also does not predict an E-E interaction. The orbital interaction between the main group fragment and the transition metals is such that a set of nonbonding orbitals is created that can hold as many as six skeletal electrons more than expected.

These l ~ ~ compounds are listed in Table XV and may be viewed as a fusion of two tetrahedral EM3 units about a common M3 triangle. They all possess six pairs of electrons for skeletal bonding as expected from Wade’s electron counting rules for a five-vertex cluster. The number of M-M and M-E contacts is nine so that the bonding picture can be viewed as being delocalized. This is in contrast to most of the compounds discussed so far in that those, with the exception of the inidene molecules, can be considered in terms of two center-two electron bonds.

5y a rarity owing to the high basicity of the phosphorus lone pair. It is most likely probably stabilized by the steric crowding/protection of the P(OMe)3ligands. As noted earlier, Kings5 has suggested that the edge-localized view is the appropriate one for the trigonal bipyramidal molecule if the four connected vertices are considered to use four internal orbitals for cluster bonding rather than the conventional three. This has some implications for the ability of E to occupy the equatorial sites in E2M3 trigonal bipyramids.

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A Proposed Experiment on the Nature of Light by Dennison D.M.


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