Synthesis and Characterization of Chiral Mercury(II) and Cadmium(II) Complexes with 3,3′-Bipyridine-5,5′,6,6′-tetramethyl-2,2′-dimethoxy-1,1′-biphenyl

Two homochiral mercury (1) and cadmium (2) complexes derived from chiral twisted biphenyl pyridine ligand (3,3'-bipyridine-5,5',6,6'-tetramethyl-2,2'-dimethoxy-1,1'-bi-phenyl) have been synthesized and characterized by IR, microanalysis, TGA, UV-Vis, powder and single-crystal X-ray crystallography. Both 1 and 2 crystallize in orthorhombic space group P2(1)2(1)2 with Z = 2. For 1, a = 14.2038(16), b = 14.3630(17), c = 7.0257(8) angstrom, V = 1433.3(3) angstrom(3), M(r) = 878.91, D(c) = 2.037 g/cm(3), mu = 7.549 mm(-1), F(000) = 824, the final GOF = 1.017, R = 0.0296 and wR = 0.0645 for 2925 observed reflections with I > 2 sigma(I). For 2, a = 14.212(3), b = 14.392(3), c = 7.0498(14) angstrom, V = 1442.0(5) angstrom(3), M(r) = 790.72, D(c) = 1.821 g/cm(3), mu = 2.924 mm(-1), F(000) = 760, the final GOF = 1.075, R = 0.0340 and wR = 0.0834 for 3144 observed reflections with I > 2 sigma(I). The crystal structures of 1 and 2 are isostructural and each adopts a two-dimensional supramolecular network which contains the C-H center dot center dot center dot pi interactions.