A series of coordination polymers based on varied polycarboxylates and different imidazole-containing ligands: syntheses, crystal structures and physical properties

摘要: To investigate the effect of organic ligands on coordination frameworks, seven new nickel complexes with formulae Ni(BDC) (titmb)·3H2O (1), Ni2(BDC)2(bimb)2(H2O)2·3H2O (2), NiZn(BTC)(titmb)Br (3), Ni(TBDC)(titmb)(H2O) (4), Ni(TBDC)(bix)·H2O (5), Ni(TBDC)(mbix)(H2O)·H2O (6) and Ni(TBDC)(obix)(H2O) (7) (titmb = 1,3,5-tris(1-imidazol-1-ylmethyl)-2,4,6-tri-methylbenzene, bimb 4,4′-bis(imidazol-1-ylmethyl)biphenyl, bix 1,4-bis(imidazol-1-ylmethyl)benzene, mbix 1,3-bis(imidazol-1-ylmethyl)benzene, obix 1,2-bis(imidazol-1-ylmethyl)benzene, H3BTC 1,3,5-benzenetricarboxylic acid, H2BDC isophthalic H2TBDC 5-(tertbutyl)isophthalic acid), have been synthesized characterized by elemental analyses, infrared spectra (IR), thermogravimetric analysis (TGA) single-crystal X-ray diffraction. Single crystal structure shows that complex 1 has a three-dimensional (3D) (3,5)-connected network topology (63)(69·8). Complexes 2 6 similar two-dimensional (2D) lamella structures (4,4) topology. Complex 3 exhibits an interesting 3D (3,6)-connected framework self-penetration two sets (10,3)-a nets. 4 presents unusual 2D (3·52)(32·53·64·7). 5 features two-fold interpenetrating (46·64)-bnn hexagonal BN topology, whereas 7 possesses one-dimensional (1D) independent single-wall metal–organic nanotube. The various dimensions structural may be attributed to different species functional groups, number position carboxylic groups in carboxylates as well auxiliary playing significant role promoting diversity observed motifs. SHG properties 1, ferroelectric for also investigated.