The Reactivity of the Unbridged Co-Sn Bond in [(eta~5-C_5H_5)(eta~2-C_2H_4)Co-Sn{CH[Si(CH_3)_3]_2}_2l-The First Organometallic Complexes with direct Co-Sn-Chalcogen Bonding (Chalcogen = Se, Te)

摘要

Unbridged metal-metal bonds offer ideal prerequisites for the linkage of novel metal-element bonds by insertion or addition reactions. Metal-metal bonds in heterodimetallic complexes are particularly promising, since these bonds can be strongly polarized by the appropriate combination of metals and thus exhibit a high reactivity. Our interest in this area has focused on heterodinuclear organometallic complexes containing a reactive M-M' bond (M = transition metal; M' = metal from group 12, 13, or 14), particularly those with an unbridged M-Sn bond. These can form low molecular weight complexes with direct Sn-chalcogen-M bonds either by insertion or addition. It is our aim to use such compounds as precursors for the deposition of ternary magneticallydoped group 14/16 semiconductors, which show very promising potential for magnetooptical applications. To date examples are known for the deposition of binary metal chalcogenide films such as M'/E (M = Fe, Mn; E = S, Se, Te), M/E ((M' = metals from group 12,13, or 14), and M"/E (M" = Eu, Sm, Yb) from precursor complexes of the appropriate composition.