Hong-Jian Cheng

Structural diversification and photocatalytic properties of zinc(II) polymers modified by auxiliary N-containing ligands

Four new coordination polymers, {[Zn(bismip)]·2H2O}n (1), {[Zn2(bismip)2(4,4′-bipy)]·2H2O}n (2), {Zn2(bismip)2(phen)}n (3) and {[Zn(bismip)(bimb)]2·2H2O·DMF}n (4) (H2bismip = 5-(1H-benzoimidazol-2-ylsulfanylmethyl)-isophthalic acid, 4,4′-bipy = 4,4′-bipyridine, phen = 1,10-phenanthroline, bimb = 4,4-bis(1-imidazolyl)bibenzene) were synthesized under solvothermal conditions. All these compounds were characterized by elemental analysis, IR spectroscopy, thermal analysis, powder X-ray diffraction and single-crystal X-ray diffraction. Compound 1 features a two-dimensional (2D) binodal (3,6)-connected kgd network with (43)2(46·66·83) topology. 2 exhibits two-fold interpenetrating 3D architecture with a (4·82)(42·84) Schlafli symbol in which 2D layers are interlinked by 4,4-bipy ligands. In 3, the [Zn4(bismip)4] and [ZnO4N2] units are interconnected, affording a binodal 3D (3,4)-connected network with the Schlafli symbol (83)(86). 4 is a 2D (3,4)-connected coordination network with (42·6)(42·63·8) topology. The photoluminescence properties and photocatalytic properties of these compounds were also investigated.

Alkyl group-directed assembly of coordination polymers based on bis-(4-imidazol-1-yl-phenyl)-amine and their photocatalytic properties

Hydrothermal reactions of Zn(NO3)2·6H2O or CdCl2·2.5H2O with bis-(4-imidazol-1-yl-phenyl)-amine (bimpa) and 5-methyl-1,3-benzenedicarboxylic acid (5-Me-1,3-H2BDC) or 5-tert-butyl-1,3-benzenedicarboxylic acid (5-tb-1,3-H2BDC) afforded four coordination polymers, [Zn2(5-Me-1,3-BDC)2(bimpa)2]n (1), {[Cd2(5-Me-1,3-BDC)2(bimpa)(H2O)4]·H2O}n (2), {[Zn(5-tb-1,3-BDC)(bimpa)]·2H2O}n (3) and {[Cd(5-tb-1,3-BDC)(bimpa)]·H2O}n (4). Complexes 1–4 were characterized by elemental analysis, IR, powder X-ray diffraction, and single-crystal X-ray diffraction. 1 exhibits a 4-fold interpenetrating 3D framework in which 1D curvilinear chains are interconnected by bimpa ligands. 2 can be considered as a 3D supramolecular architecture based on 2D entanglements which consist of 1D tubes in parallel interpenetration. 3 and 4, respectively, have 2D (65·8) layers (3) and 2D layers constructed by 1D tubes (4), which are further extended into two 3D supramolecular architectures through weak hydrogen-bonding and π⋯π interactions. The solid state luminescence and optical properties of 1–4 at ambient temperature were also investigated. A comparative study on their photocatalytic activity toward the degradation of methylene blue in polluted water was explored.