Triorganotin carboxylates - synthesis and crystal structure of 2-methyl-1H-imidazol-3-ium catena-O, O '-oxalatotriphenylstannate

摘要

The reaction of bis(2-methyl-1H-imidazol-3-ium) oxalate, [C4H7N2](2) [C2O4], and bis(triphenyltin) oxalate, [(Ph3Sn)(2) (C2O4)], in methanol at room temperature yielded the formation of 2-methyl-1H-imidazol-3-ium catena-O, O'-oxalatotriphenylstannate, [C4H7N2][Ph-3 Sn(C2O4)] (1), which crystallizes in the monoclinic space group P2(1)/c with Z = 8, a = 16.9334(14) angstrom, b = 17.3251(14) angstrom, c = 14.5114(10) angstrom, beta = 90.590(2) angstrom, and V = 4257.0(6) angstrom(3). The oxalate ligand of 1 displays a bridging coordination mode and thus links two SnPh3 moieties through an axial coordination leading to the propagation of infinite polymeric chains along the c axis. All Sn(IV) atoms exhibit a trigonal bipyramid geometry. The negative charge of [Ph-3 Sn(C2O4)]-moieties is compensated by the presence of surrounding noncoordinating 2-methyl-1H-imidazol-3-ium cations. From a supramolecular point of view, the Sn-based chains are connected to one another through N-H center dot center dot center dot O hydrogen bond interactions involving oxalate ligands of distinct strands and doubly by the [C-4 H7N2](+) cations. The topology of the resulting crystal packing can be described as a two-dimensional layer network.