Heptacoordinate dimethyltin(IV)cupferronato complexes - X-ray and solid-state NMR structural analysis - Hydrogen bond supramolecular self-assembly

Reaction of the dimeric dimethyltin(IV)cupferronato complex [Me2Sn(O2N2Ph)( 2)](2) (1) with 4,4'-bipyridine (bipy), pyridine (py), and 2,6-diamino-4-ph enyl-1,3,5-triazine (dpt) afforded three new hepta-coordinated derivatives, [mu-(4,4'-bipy)(Me2Sn(O2N2Ph)(2))(2)]. MeOH (2), Me2Sn(O2N2Ph)(2)(py) (3), and [Me2Sn(O2N2Ph)(2)(MeOH)]. dpt (4). These were characterised by X-ray s tructural analysis and solid-state Sn-119, C-13 CP NIAS NMR-, and multinucl ear solution NMR spectroscopy. Single-crystal X-ray diffraction analysis of 2-4 showed that in all three compounds tin was hepta-coordinated, and the cupferronato anions were chelated to the Me2SnIV centre in a nearly symmetr ical arrangement. Compound 4 contained supramolecular self-assembled ribbon s, formed by hydrogen bonds between Me2SnO5 moieties and pairs of dpt molec ules.