Bond lengths fullerene complexes

Almost simultaneously, a platinum complex, in which the metal atom is bonded directly to the fullerene cage, was prepared.[Fa91 ] The site of attachment is the 6 6 double bond, as for the osmium derivative. The carbon bond lengths in the fullerene complexed with Pt are also similar to neat Ceo and to the Os derivative described above. Further details and other metal attachments are described in a review paper.[Fa92]... 

With gram quantities of fullerenes readily available thanks to the Kratschmer-Huffman arc vaporization technique, several properties of the Ceo cluster have been measured lately. Other data has been provided by recent ab initio calculations. In this section, we list the properties that are of relevance to the formation of endohedral complexes. These include molecular geometry (the bond lengths and the cage radius), ionization potential and electron affinity, and electric polarizability. The so-called endohedral effect is also discussed here. 

As far as the fullerene internal structure is concerned, there is little change on metal complexation. The metal bound transannular [6,6] bond is elongated relative to the remaining fullerene C=C bonds. It often attains a length (=1.5 A) comparable with that of other C—C bonds such as the transannular [6,5] bond or those for an analogous alkene complex. The structure often is described as metallacyclopro-... 

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