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Preparation, structural and magnetic characterization of trinuclear and one-dimensional cyanide-bridged Co(III)-Cu(II) complexes
Indian Journal of Chemistry, Section A ( IF 0.412 ) Pub Date : 2020-03-20
Wenlong Lan, Jingwen Shi, Zhen Zhou, Qingyun Liu, Daopeng Zhang

By employing two trans-dicyanocobolt(III) building blocks K[Co(bpb)(CN)2] (bpb2- = 1,2-bis(pyridine-2-carboxamido)benzenate), K[Co(bpmb)(CN)2] (bpmb2- = 1,2-bis(pyridine-2-carboxamido)-4-methyl-benzenate) and one 14-membered macrocycle Cu(II) compound as assembling segment, two cyanide-bridged CoIII-CuII complexes {{[Cu(cyclam)][Co(bpb)(CN)2]}ClO4}n·nCH3OH·nH2O (1) and {[Cu(cyclam)][Co(bpmb)(CN)2]2}·4H2O (2) (cyclam = 1,4,8,11-tetraazacyclotetradecane) have been successfully prepared and characterized by elemental analysis, IR spectroscopy and X-ray structure determination. Single X-ray diffraction analysis shows that complex 1 can be structurally characterized as one-dimensional cationic single chain consisting of alternating units of [Cu(cyclam)]2+ and [Co(bpb)(CN)2]- with free ClO4- as balanced anion, while complex 2 presents cyanide-bridged neutral trinuclear bimetallic structure containing Co2Cu core, giving clear information that the substitute group on the cyanide precursor has obvious influence on the structure type of the target compound. Investigation over magnetic properties of complex 1 reveals the weak antiferromagnetic coupling between the neighboring Cu(II) ions through the diamagnetic cyanide building block.

中文翻译:

三核和一维氰化物桥联的Co(III)-Cu(II)配合物的制备,结构和磁性表征

通过使用两个反式-dicyanocobolt(III)构件K [Co(bpb)(CN)2 ](bpb 2- = 1,2-双(吡啶-2-甲酰胺基)苯甲酸酯),K [Co(bpmb)(CN )2 ](bpmb 2- = 1,2-双(吡啶-2-甲酰胺基)-4-甲基苯甲酸酯)和一个14元大环Cu(II)化合物作为组装片段,两个氰基桥连的Co III -Cu II配合物{{[Cu(cyclam)] [Co(bpb)(CN)2 }} ClO 4 } n ·nCH 3 OH·nH 2 O(1)和{[Cu(cyclam)] [Co(bpmb)( CN)2 ] 2 }·4H 2 O(2)(cyclam = 1,4,8,11-四氮杂环十四烷)已成功制备并通过元素分析,红外光谱和X射线结构测定进行了表征。单X射线衍射分析表明,配合物1可以在结构上表征为一维阳离子单链,由[Cu(cyclam)] 2+和[Co(bpb)(CN)2 ]的交替单元组成-带有游离ClO 4 -作为平衡阴离子,而配合物2则呈现出含有Co 2的氰化物桥接的中性三核双金属结构Cu核,清楚地表明氰化物前体上的取代基对目标化合物的结构类型有明显影响。对配合物1的磁性进行的研究表明,通过反磁性氰化物构造单元,相邻的Cu(II)离子之间的反铁磁耦合较弱。
更新日期:2020-03-20
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