Molecular structure of [Cu2(MeCN)2(μ-tpy)2][BPh4]2:: A helical di-cuprous terpyridine complex

The molecular structure of [Cu-2(MeCN)(2)(mu-tpy)(2)][BPh4](2) has been determined. The two terpyridine ligands coordinate to the same Cu(I) center in a bidentate configuration, in which the copper adopted a distorted tetrahedral geometry with the four nitrogen donors. The third ring of each terpyridine ligand forms a bridge with a second Cu(I) center, whose tetrahedral coordination sphere is completed by two acetonitrile ligands. The resulting structure represents a section of a double helix. Crystal data: space group C2/c, a = 27.202(5), b = 12.995(3), c = 23.409(5) angstrom, beta = 123.13(3); V = 6930(2) angstrom(3), Z = 4, R = 0.0613, wR (2) = 0.0946.