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Owing their large radii, transition metals generally form clusters that are larger than main group elements. One consequence of their increased size, these clusters often contain atoms at their centers. A prominent example is [Fe<sub>6</sub>C(CO)<sub>16</sub>]<sup>2-</sup>. In such cases, the rules of electron counting assume that the interstitial atom contributes all valence electrons to cluster bonding. In this way, [Fe<sub>6</sub>C(CO)<sub>16</sub>]<sup>2-</sup> is equivalent to [Fe<sub>6</sub>(CO)<sub>16</sub>]<sup>6-</sup> or [Fe<sub>6</sub>(CO)<sub>18</sub>]<sup>2-</sup>.<ref>{{cite book |doi=10.1002/0470862106.ia097|chapter=Cluster Compounds: Inorganometallic Compounds Containing Transition Metal & Main Group Elements|title=Encyclopedia of Inorganic Chemistry|year=2006|last1=Fehlner|first1=Thomas P.|isbn=0470860782}}</ref>
==See
* [[Styx rule]]
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[[Category:Organometallic chemistry]]
[[Category:Cluster chemistry]]
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