ELECTRON-TRANSFER IN MIXED-VALENCE 1,1,12,12-TETRA-N-BUTYL[1,1]STANNAFERROCENOPHANE - ELECTROCHEMICAL AND NEAR-IR SPECTROSCOPIC STUDIES

The physical properties of neutral and mixed-valence 1,1,12,12-tetra-n-butyl[1,1]stannaferrocenophanes are reported. The structure of the endo,endo-1,12-di-n-butyl-exo,exo-1,12-diiodo[1,1]stannaferrocenophane has been determined by X-ray diffraction. The compound crystallizes with monoclinic symmetry, space group P21/C, a 10.3282(14), b 10.7916(12), c 13.6772(18) Å, β 94.080(12)°, V 1520.57 Å3, and Z = 2. The structure was refined to give conventional discrepancy factors of RF = 0.036 and RWF = 0.031. The electron-transfer in the σ-bridged 1,1,12,12-tetra-n-butyl[1,1]stannaferrocenophane cation is attributed to the d-π overlap mechanism of tin atoms and the cyclopentadiene rings. © 1990.