title: Rigid versus semi-rigid bis(imidazole) ligands in the assembly of two Co(ii) coordination polymers: structural variability, electrochemical properties and photocatalytic behavior.
abstract: The hydrothermal reactions of 1,2,4,5-cyclohexanetetracarboxylic acid (H4L) with CoCl2·2H2O and rigid or semi-rigid bis(imidazole) ligands were able to generate two Co(ii) coordination polymers (CPs), {[Co5(L)2(1,4-bimb)(μ3-OH)2(H2O)8]·2H2O}n(1), {[Co(L)0.5(1,4-bib)]·H2O}n(2) (1,4-bimb = 1,4-bis(imidazol-1-ylmethyl)benzene, 1,4-bib = 1,4-bis(1H-imidazol-1-yl)benzene). CPs 1 and 2 were structurally characterized by elemental analysis, IR spectroscopy, X-ray powder diffraction and single crystal X-ray diffraction. CP 1 features a 3D 3,3,4,4,5-connected framework with an unprecedented {42·8·102·12}{43·6·86}2{43}2{46}2{62·8}2topology, which represents the first example of CPs with such a topology. CP 2 possesses a three-fold interpenetration 3D framework with mog topology. The distinct structures of the two CPs may result from diverse coordination modes of the (L)4-ligands and different structural characteristics of rigid or semi-rigid N-donor ligands. The thermal stabilities, photoluminescence properties and electrochemical behavior in the solid state for CPs 1 and 2 have been investigated. The photophysical studies indicated that CPs 1 and 2 are potential semiconductive materials. Moreover, both CPs 1 and 2 show high photocatalytic efficiency for the degradation of methylene blue (MB) under UV light irradiation and exhibit good stability and recyclability. A possible photocatalytic mechanism is speculated by introducing t-butyl alcohol (TBA) as a widely used ˙OH scavenger.
authors.affiliation: College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Material, North China University of Science and Technology, Tangshan, Hebei 063009, P. R. China. tscghua@126.com.
authors.forename: Jing-Wang
authors.initials: JW
authors.lastname: Cui
authors.affiliation: College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Material, North China University of Science and Technology, Tangshan, Hebei 063009, P. R. China. tscghua@126.com.
authors.forename: Suo-Xia
authors.initials: SX
authors.lastname: Hou
authors.affiliation: XStruct, Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281-S3, 9000 Ghent, Belgium.
authors.forename: Kristof
authors.identifier: http://orcid.org/0000-0002-2455-8856
authors.initials: K
authors.lastname: Van Hecke
authors.affiliation: College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Material, North China University of Science and Technology, Tangshan, Hebei 063009, P. R. China. tscghua@126.com.
authors.forename: Guang-Hua
authors.identifier: http://orcid.org/0000-0001-9624-5990
authors.initials: GH
authors.lastname: Cui