Thermodynamic and multinuclear magnetic resonance study of dimethyltin(IV) complexes with tridentate ligands in aqueous solution

Abstract

The complex formation of [SnMe₂]²⁺ ion with iminodiacetate, oxydiacetate and thiodiacetate ligands has been investigated by potentiometric, calorimetric and multinuclear magnetic resonance measurements in aqueous solution at 25 °C and I= 0.1 mol dm^–3(KNO₃). Both the thermodynamic values and NMR parameters revealed the flexibility of the organometallic ion, as regards both the Me–Sn–Me angle and its ability to adopt unusual asymmetric stereochemistries. A new stereochemistry was found for the five-co-ordinated iminodiacetate complex, the formation of which exhibits three-site kinetics.