Abstract
Abstract The coordination effect of transition metal TMLn (L = co-ligand) on stannylenes R2SnBn (B = base, n = 0–2) has been examined analysing 119Sn NMR data and X-ray molecular structures from the literature up to 2008. Coordination deshielding Δδ (119Sn) and chemical shift δ (119Sn) of BnR2Sn–TM(CO)n complexes, linearly correlate with δ (119Sn) of R2Sn. Slope, intercept and typical regions are interpreted through different ratios of σ/π-back bonding and impact of TM, R and Bn. Hybridisation changes explain dependencies of 1JSn–TM coupling constants on L, R, Bn and TM gyromagnetic ratios γTM. The Sn–TM bond lengths follow a parabolic profile along the TM period, fine-tuned by R, B and Ln. Electronic modifications on carbonyl complexes classify R2Sn as poor π-acceptors, while shortening of Sn–R and widening of angles R–Sn–R correspond to increased s-character of the Sn–TM bond. A “coordinative Lewis base radius” rcoord(SnR2) of 1.18 A is proposed.
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