Two novel Keggin tungstocobaltates grafted by cobaltII complex group(s): K[Co(phen)2(H2O)]2[HCoW12O40]·2H2O and [Co(2,2′-bipy)3]1.5{[Co(2,2′-bipy)2(H2O)][HCoW12O40]}·0.5H2O |
| |
Institution: | 1. Key Laboratory of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, PR China;2. Faculty of Chemistry and Pharmacy, Jiamusi University, Jiamusi, HeilongJiang 154007, PR China |
| |
Abstract: | Two novel inorganic–organic hybrid compounds composed of Keggin tungstocobaltate framework and cobalt(II)–N coordination complexes, KCo(phen)2(H2O)]2HCoW12O40]·2H2O (1) (phen = 1,10-phenanthroline) and Co(2,2′-bipy)3]1.5{Co(2,2′-bipy)2(H2O)]HCoW12O40]·0.5H2O (2) (bipy = bipyridine), have been synthesized under hydrothermal conditions by directly using Keggin POMs as starting materials, which were characterized by elemental analyses, IR, TG analyses and X-ray single crystal diffraction. Crystal data for compound 1: C48H41Co3KN8O44W12, triclinic, space group P-1, a = 10.918(5) Å, b = 13.401(5) Å, c = 13.693(5) Å, α = 69.291(5)°, β = 71.568(5)°, γ = 78.421(5)°, V = 1768.9(12) Å3, Z = 1; for compound 2: C130H104Co7N26O83W24, orthorhombic, space group, C2/c, a = 46.839(9) Å, b = 14.347(3) Å, c = 26.147(5) Å, α = β = γ = 90°, V = 17,570(6) Å3, Z = 4. Compound 1 exhibits a pseudo-1D chainlike structure, in which potassium ions act as linkages of Keggin unit doubly grafted by Co(phen)2(H2O)] complex. Compound 2 represents a Co(2,2′-bipy)2(H2O)]2+ mono-grafted Keggin tungstocobaltate derivative with 1.5Co(2,2′-bipy)3]2+ countercations. The cyclic voltammetric behavior of 1-CPE is similar to the parent 3-CPE, but the cyclic voltammetric behavior of CoII shows a little difference. Variable-temperature magnetic susceptibility measurement of compound 1 demonstrates the presence of antiferromagnetic interactions. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|