Syntheses and Structures of Two Cadmium Complexes with Isophthaloylbisglycine Acid and 4,4'-Bipyridine

The two title complexes [{Cd(IBG-CH_3)(4,4'-bipy)(H_2O)_2}·NO_3]_n 1 and [{Cd(IBG)-(4,4'-bipy)(H_2O)_2}·2H_2O]_n2 (H_2IBG = isophthaloylbisglycine and 4,4'-bipy = 4,4'-bipyridine) have been synthesized and characterized by single-crystal structure determination, IR and TG analyses. Complex 1 crystallizes in monoclinic, space group C2/c with a = 27.221(2), b = 11.6093(7), c = 16.3571(9) (A), V= 5149.2(6) (A)~3, Z= 8, C_(23)H_(23)N_5O_(11)Cd, M_r= 657.86, D_c = 1.697 g/cm~3, F(000) =2656.00, μ(MoKα) = 0.919 mm~(-1), the final R = 0.0478 and wR = 0.0882 for 3728 observed reflections with I> 2σ(I). Complex 2 crystallizes in triclinic, space group P_(1) with a = 9.0940(4), b = 11.6852(5), c = 13.1119(6) (A), V= 1230.26 (A)~3, Z = 2, C_(22)H_(26)N_4O_(10)Cd, M_r = 618.87, D_c = 1.671 g/cm~3, F(000) = 628.0, μ(MoKα) = 0.951 mm~(-1), the final R = 0.0567 and wR = 0.1124 for 3713 observed reflections with I > 2σ(I). In both structures, the Cd~(II) metal centers are coordinated by seven atoms to form a distorted pentagonal bipyramidal geometry.