title: Solvent-induced synthesis of cobalt(II) coordination polymers based on a rigid ligand and flexible carboxylic acid ligands: syntheses, structures and magnetic properties.
abstract: Five new cobalt(ii) coordination architectures, {[Co(L)2(H2O)2]·2H2O·2NO3}n (), {[Co(L)(ppda)]·2H2O}n (), {[Co2(L)(ppda)2]2·H2O}n (), {[Co(L)(nba)]·5H2O}n (), and {[Co(L)(oba)]2·3H2O}n (), have been constructed from the rigid ligand L [L = 2,8-di(1H-imidazol-1-yl)dibenzofuran] and different flexible carboxylic acid ligands [H2ppda = 4,4'-(perfluoropropane-2,2-diyl)dibenzoic acid, H2nba = 4,4'-azanediyldibenzoic acid, and H2oba = 4,4'-oxydibenzoic acid]. Depending on the nature of the solvent systems, these five different coordination polymers were synthesized and characterized by single-crystal X-ray diffraction, IR, PXRD and elemental analysis. Compounds , and were obtained by a one-pot method, and then we utilized the solvent-induced effect to obtain almost pure crystals of , respectively. Compound is an infinite 1D chain which is formed by L ligands and Co atoms. Compound contains a [Co2(CO2)4] secondary building unit (SBU), and can be topologically represented as a 6-connected 2-fold interpenetrating pcu net with the point symbol of {4(12)·6(3)}. Compound can be characterized as a 4-connected sql tetragonal planar network with the point symbol of {4(4)·6(2)}. In compounds and , there is a 1D chain which is formed by flexible carboxylic acid ligands and Co atoms; then the 1D chain is linked by L ligands in the tilting direction, leading to the formation of a 2D layer. Furthermore, UV-vis, TGA and magnetic properties have been investigated in detail.
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China. zhenghg@nju.edu.cn.
authors.forename: Ting
authors.initials: T
authors.lastname: Wang
authors.forename: Chuanlei
authors.initials: C
authors.lastname: Zhang
authors.forename: Zemin
authors.initials: Z
authors.lastname: Ju
authors.forename: Hegen
authors.initials: H
authors.lastname: Zheng
mesh_terms: D002264:Carboxylic Acids / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D008024:Ligands; D060328:Magnetic Phenomena; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry*; D033362:Powder Diffraction; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D002264:Carboxylic Acids; D056831:Coordination Complexes; D008024:Ligands; D011108:Polymers; D012997:Solvents; D003035:Cobalt