Reactivity of bisthiosemicarbazones with Sn(II) and Sn(IV): The synthesis and structure of an eight-coordinate complex with two bis(thiosemicarbazone) ligands

Reaction of SnCl2 with the bisthiosemicarbazone ligand ATSMH2 led to the formation of the octahedral tin(IV) complex [Sn(ATSM)Cl2] (1) comprising one doubly deprotonated ligand occupying the equatorial positions and two axial chlorides. Reaction with SnI4 gave [Sn(ATSM)2] (2), containing two doubly deprotonated ligands giving a distorted dodecahedral geometry. The complexes were characterised by elemental analysis, mass spectrometry, 13C and 119Sn CP/MAS NMR and in the case of complex 2 by X-ray diffraction.