Syntheses and Crystal Structures of Two 3D Zinc(II) Compounds Involving Coordination and Hydrogen Bonds

Two zinc(II) compounds, [Zn(L)(H2O)2]n 1 and [Zn(4,4-bpy)(H2O)4](L) 2 (H2L = trans,trans-1,3 butadiene 1,4-dicarboxylic acid), were synthesized by hydrothermal methods and characterized by single-crystal X-ray diffraction analyses. Compound 1 crystallizes in monoclinic, space group C2/c with a = 15.4970(16), b = 5.4976(6), c = 10.7113(12) , β = 96.298(6)°, C6H8O6Zn, Mr = 241.50, V = 907.06(17) 3, Z = 4, Dc = 1.768 g/cm3, F(000) = 488, μ = 2.703 mm–1, S = 1.060, the final R = 0.0256 and wR = 0.0660 for 968 observed reflections with I 2σ(I). Compound 2 crystallizes in triclinic, space group P1 with a = 6.915(2), b = 7.166(2), c = 10.363(3) , α = 73.250(4), β = 84.429(4), γ = 61.605(3)°, C16H20N2O8Zn, Mr = 433.70, V = 432.1(2) 3, Z = 1, Dc = 1.667 g/cm3, F(000) = 224 and μ = 1.471 mm–1, S = 1.118, the final R = 0.0486 and wR = 0.1077 for 1352 observed reflections with I 2σ(I). Upon using the assembly strategy of com- bination of coordination polymer chains with intermolecular hydrogen bonds, three-dimensional frameworks of complexes 1 and 2 were formed.