A Co(II) Coordinated Polymer with 2-Fold Interpenetration 3D Architecture Based on 5-(Imidazol-1-ylmethyl)isophthalate: Hydrothermal Synthesis, Crystal Structure and Properties

One cobalt coordinated polymer with 2-fold parallel interpenetration 3D architecture based on flexible 5-(imidazol-1-ylmethyl)isophthalate (L2-) as a main ligand and 4,4'-bipyridine (bpy) as a nitrogen-containing ancillary ligand, {[CoL(bpy)(0.5)(H2O)(3)](2)}(n) (1), has been obtained under hydrothermal conditions and characterized by elemental analysis, powder X-ray diffraction (PXRD), IR spectra, Uv/vis spectra, thermal gravimetric analyses (TGA) and single-crystal X-ray diffraction. It crystallizes in monoclinic, space group C2/c with a = 26.323(4), b = 14.696(2), c = 26.630(4) angstrom, beta = 157.747(4)degrees, V = 3901.2(1) angstrom(3), Z = 8, M-r = 435.27, D-c = 1.480 g/cm(3), mu = 0.923 mm(-1), R-int = 0.0900, F(000) = 1792, the final R = 0.0722 and wR = 0.0946 for 3641 observed reflections (I > 2 sigma(I)). Complex 1 exhibits a two-fold interpenetration 3D framework. As a single net of the 2-fold interpenetration structure, the L2- anion of complex 1, as a bridging ligand, connects the Co(II) ion to form two-dimensional layers (Co3L3)(n) which are further linked to build a three-dimensional framework by bpy ligand.