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Synthesis, structures and magnetic properties of Cu(II) and Co(II)?compounds based on asymmetric 5?(1H?imidazole?l?yl)?3?pyridine carboxylic acid.?

Five coordination compounds [Cu 2 (impc) 2 ( ? 2 ?OH)Cl] n ( 1 ), [Cu 2 (impc) 2 ( ? 2 ?OH)Br] n ( 2 ), [Co(impc) 2 (H 2 O) 2 ] n ( 3 ), [Co 4 (impc) 4 (SO 4 ) 2 (H 2 O)] n ( 4 ) and {[Co(impc)(H 2 O) 2 ] . H 2 O} ( 5 ) based on asymmetric 5?(1H?imidazole?l?yl)?3?pyridinecarboxylic acid (Himpc) have been hydrothermally synthesized and structurally characterized. 1 and 2 are isostructural and consist of binuclear Cu(II) units and display two?dimensional (2D) framework, where 1 and 2 present a new {(4.6 2 )(4 2 .6 5 .8 2 .10)(4)} topology. 3 features a 1D chain structure. Polymer 4 , which also displays a new Schl?fli symbol {(4 13 .6 20 .8 8 .10 4 )(4 3 ) 2 (4)}, contains tetranuclear Co(II) cluster and is a 2D structure. The planar?type tetranuclear Co(II) cluster with SO 4 2? bridge in 4 hasn?t been reported. Compound 5 possesses a mononuclear structure. Magnetic susceptibility studies for 1 and 2 with Cu 2 units reveal the antiferromagnetic coupling with J = ?3.42 cm ?1 for 1 and J = ?3.83 cm ?1 for 2 . Contrary to the only example of class F2 ferromagnetic VII , 1 and 2 (class F2) exhibit different antiferromagnetic behaviours. 3?5 exhibit ferromagnetic behaviour, and its M(H) curve is consistent with the ferromagnetic nature. No peaks are observed in the out?of?phase ( ??? ) plots of 3 , suggesting no long?range order and no spin canting.

» Author: Jinpeng Li, Misbha Rafiq Khan, Bin Liu, Xiaoge Niu, Bohan Li, Yaping Hao, Zhongyi Liu

» Reference: doi:10.1002/ejic.202000595

» Publication Date: 07/07/2020

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