Synthesis and crystal structures of new complexes of di- and tribenzyltin 2-amino-1-cyclopentene-1-carbodithioates

Treatment of dibenzyltin dichloride with 1 equiv. of 2-amino-1-cyclopentene-1-carbodithioic acid (ACDA) gave Bz2SnCl(ACDA) (1) that contains five coordinate tin. Reaction of 2 equiv. of ammonium 2-amino-1-cyclopentene-1-carbodithioic acid (AACD) with Bz2SnCl2 and then recrystallization from THF produced Bz2Sn(ACDA)2 · THF 2 in which the coordination geometry around the Sn is highly distorted from octahedral. Bz3Sn(ACDA) (3) was obtained from reaction of Bz3SnCl with 1 equiv. of AACD. The crystal structure of 3 indicates a Sn–S′ interaction [3.0823(5) Å] that distorts the tin coordination geometry from that of an ideal tetrahedron. In 1–3 the tin atom is also coordinated to one carbon atom of each benzyl group. The products were characterized by IR and NMR (1H, 13C, 119Sn) spectroscopy and elemental analysis.