Structure and Solution Study of Molecular Triorganotin Compounds Containing an N,C,N Ligand

The triorganotin compounds R2(NCN)SnX (NCN = C6H3(Me2NCH2)2-2,6-) containing different polar
groups X or substituents R were prepared. The set of organotin compounds Ph2(NCN)SnX (X = I (2),
CF3CO2 (3), CH3CO2 (4), Et2NCS2 (5)) was prepared to study the influence of the polar group X on the
character of the Sn−X bond. The effect of substituents R on the character of the Sn−X bond was studied
in two additional sets of organotin compounds, R2(NCN)SnCl (R = Ph (6), Bu (7), Me (8)) and
R2(NCN)SnO2CCH3 (R = Ph (4), Bu (9), Me (10)). The influence of different solvents and temperatures
on the presence or absence of covalent Sn−X bonds was studied as well. 1H and 119Sn NMR spectroscopy
showed the occurrence of dissociation of the Sn−O2CCH3 covalent bond in CD2Cl2 solutions of 4, 9,
and 10 at various temperatures (range 300−200 K). The crystal structures of 8 and 10 were studied by
X-ray crystallography.