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Benjah-bmm27 (talk | contribs) →Predicting structures of cluster compounds: added a diagram of closo, nido and arachno borane skeletons with 4-12 vertices |
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==Predicting structures of cluster compounds==
[[File:Re4CO122-.svg|thumb|The structure of the [[butterfly cluster compound]] [Re<sub>4</sub>(CO)<sub>12</sub>]<sup>2−</sup> conforms to the predictions of PSEPT.]]▼
Different rules (4''n'', 5''n'', or 6''n'') are invoked depending on the number of electrons per vertex.
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A molecular orbital treatment can be used to rationalize the bonding of cluster compounds of the 4''n'', 5''n'', and 6''n'' types.
▲[[File:Re4CO122-.svg|thumb|The structure of the [[butterfly cluster compound]] [Re<sub>4</sub>(CO)<sub>12</sub>]<sup>2−</sup> conforms to the predictions of PSEPT.]]
===4''n'' rules===
[[File:Deltahedral-borane-cluster-array-numbered-3D-bs-17.png|thumb|[[:en:Ball-and-stick model|Ball-and-stick model]]s showing the structures of the [[:en:Boron|boron]] skeletons of [[:en:Boranes|borane]] [[:en:Atom cluster|clusters]].]]
The following [[polyhedra]] are ''closo'' polyhedra, and are the basis for the 4''n'' rules; each of these have triangular faces.<ref name="Cotton&Wilkinson6th">{{Cotton&Wilkinson6th}}</ref> The number of vertices in the cluster determines what polyhedron the structure is based on.
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