title: Spectroscopic properties of a series of Co(II) coordination polymers and the influence of Co(II) coordination environment on photoelectric property.
abstract: Four Co(II) coordination polymers, [Co(suc)]n 1, [Co(pdc)]n 2, {[Co7(suc)4(OH)6(H2O)3]·8H2O}n 3, {[Co(bdc)(phen)(H2O)]·H2O}n 4 (H2suc=succinic acid, H2pdc=pyridine-3,4-dicarboxylic acid, H2bdc=1,2-benzenedicarboxylic acid, phen=1,10-phenanthroline) were hydrothermally synthesized and characterized by X-ray single-crystal diffraction, surface photovoltage spectroscopy (SPS), electrical conductivity, thermogravimetric analysis (TG), ultraviolet visible and near-infrared absorption spectrum (UV-Vis-NIR), infrared spectrum (IR), and elemental analysis. The structural analyses indicate that the coordination numbers of the Co(II) ions are 4, 5, 6 and 6 for the polymers 1-4, respectively. And polymers 1 and 2 exhibit 3D structure formed by suc(2-) and pdc(2-) anions bridging Co(II) ions, respectively. Polymer 3 exhibits a 2D structure with suc(2-) anions bridging seven-nuclear [Co7(OH)6(H2O)3](3-) unit and polymer 4 is a 1D structure bridged by bdc(2-) anions. The surface photoelectric properties of the cobalt polymers were mainly studied by SPS. The results of SPS reveal that all polymers possess certain photoelectric conversion property in the range of 300-800 nm. The influences of the structure, coordination micro-environment of central metal ion and structural dimensionality on response bands of SPS were discussed.
authors.affiliation: School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Jin
authors.affiliation: School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Gong
authors.affiliation: School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Han
authors.affiliation: School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Meng
authors.affiliation: School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China. Electronic address: syniu@sohu.com.
authors.forename: Shuyun
authors.initials: S
authors.lastname: Niu
mesh_terms: D000838:Anions; D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004553:Electric Conductivity; D006358:Hot Temperature; D007477:Ions; D008670:Metals / Q000737:chemistry; D010618:Phenanthrolines / Q000737:chemistry; D055668:Photochemical Processes; D011108:Polymers / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry; D013053:Spectrophotometry; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared; D019802:Succinic Acid / Q000737:chemistry; D013499:Surface Properties; D013818:Thermogravimetry
chemical_list: D000838:Anions; D007477:Ions; D008670:Metals; D010618:Phenanthrolines; D011108:Polymers; D011725:Pyridines; D003035:Cobalt; D019802:Succinic Acid; C023666:pyridine; C025205:1,10-phenanthroline
keywords: Co(II) coordination polymer; Crystal structure; Photoelectric property; Spectroscopy