Abstract
The tin-119 NMR data of a series of triarylstannane dithiocarboxylic esters and dithiocarboxylato is present in all cases, the chemical shifts span the range of δ −120 to −260 ppm (upfield of tetramethyltin) with the dithiocarboxylate anion marking the high-field barrier (δ −261 ppm). The dithiocarboxylic moiety represents a high diamagnetic increment and gives rise δ( 119Sn) shifts in the region of five-coordinate aryltin compounds. Complexation of the dithiocarboxylate anion or the dithioesters causes a downfield coordination shift due to the higher asymmetry of charge distribution at the tin nucleus. Rhenium complexes usually show more extended coordination effects than manganese. Small coordination shifts are induced by the presence of strong σ-donors or by monocoordination of the dithiocarboxylate ligand. The marked substituent influence involves relatively large 4J( 119Sn− 31P) coupling constants in complexes with phosphorus ligands.
Published Version
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