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Synthesis, Structures and Magnetic Properties of CuII and CoII Compounds Based on Asymmetric 5‐(1H‐Imidazole‐1‐yl)‐3‐pyridine Carboxylic Acid
European Journal of Inorganic Chemistry ( IF 2.2 ) Pub Date : 2020-07-07 , DOI: 10.1002/ejic.202000595
Jinpeng Li 1 , Misbha Rafiq Khan 1 , Bin Liu 2 , Xiaoge Niu 1 , Bohan Li 1 , Yaping Hao 1 , Zhongyi Liu 1
Affiliation  

Five coordination compounds [Cu2(impc)22‐OH)Cl]n (1), [Cu2(impc)22‐OH)Br]n (2), [Co(impc)2(H2O)2]n (3), [Co4(impc)4(SO4)2(H2O)]n (4) and {[Co(impc)(H2O)2]·H2O} (5) based on asymmetric 5‐(1H‐imidazole‐1‐yl)‐3‐pyridinecarboxylic acid (Himpc) have been hydrothermally synthesized and structurally characterized. 1 and 2 are isostructural and consist of binuclear CuII units and display two‐dimensional (2D) framework, where 1 and 2 present a new {(4.62)(42.65.82.10)(4)} topology. 3 features a 1D chain structure. Polymer 4, which also displays a new Schläfli symbol {(413.620.88.104)(43)2(4)}, contains tetranuclear CoII cluster and is a 2D structure. The planar‐type tetranuclear CoII cluster with SO42– bridge in 4 has not been reported. Compound 5 possesses a mononuclear structure. Magnetic susceptibility studies for 1 and 2 with Cu2 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 behavior. Compounds 3 and 5 exhibit ferromagnetic behavior, and their M(H) curve is consistent with the ferromagnetic nature. No peaks are observed in the out‐of‐phase (χ'') plots of 3, suggesting no long‐range order and no spin canting. For 4 with the Co4 units, it also exhibits ferromagnetic behavior, and the M(H) curve is consistent with the ferromagnetic nature.

中文翻译:

基于不对称5-(1H-咪唑-1-基)-3-吡啶羧酸的CuII和CoII化合物的合成,结构和磁性

五个配位化合物[Cu 2(impc)2(µ 2 -OH)Cl] n1),[Cu 2(impc)2(µ 2 -OH)Br] n2),[Co(impc)2( H 2 O)2 ] n3),[Co 4(impc)4(SO 42(H 2 O)] n4)和{[Co(impc)(H 2 O)2 ] · H 2 O}(5)基于不对称5-(1 H-咪唑-1-基)-3-吡啶羧酸(Himpc)进行了水热合成并对其结构进行了表征。12是同构结构,由双核Cu II单元组成,并显示二维(2D)框架,其中12表示新的{(4.6 2)(4 2 .6 5 .8 2 .10)(4)}拓扑。3具有一维链结构。聚合物4,它还会显示新的Schläfli符号{(4 13 .6 20 .8 8 .10 4)(4 32(4)},包含四核Co II团簇,是2D结构。尚无关于平面型四核Co II团簇与SO 4 2–桥在4中的报道。化合物5具有单核结构。对磁化率研究12与的Cu 2个单元显示反铁磁性耦合以Ĵ = -3.42厘米-11Ĵ = -3.83厘米-12。与F2类铁磁的唯一示例相反VII12(F2类)表现出不同的反铁磁行为。化合物35表现出铁磁行为,并且它们的M(H)曲线与铁磁性质一致。没有峰在失相(观察χ“”)的曲线图3,提示没有长程有序和无旋转斜。对于4与联合4单位,它也表现出铁磁行为,和中号ħ)曲线与铁磁性质相符。
更新日期:2020-07-07
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