Five Co -Ordination in Tin Compounds
The occurrence of five coordination in a wide range of organo -tin compounds has been firmly established in recent years. Of such compounds, the most surprising are those of the type R3SnX, where X is an inorganic anion (e.g. F-, ClO-4, BF-4). The crystallographic and spectroscopic evidence for five coordination in three such compounds, (CH3)3SnF, (CH3)3SnBF4, and (CH3)3SnSbF6 will be briefly reviewed, since the latter cases provide the first evidence for such bridging interaction by the BF4 and SbFs ions. Detailed discussions of these compounds have already been published (1, 2).