Tuning the structure and magnetism of azido-mediated Cu(II) systems by coligand modifications.
Tuning the structure and magnetism of azido-mediated Cu(II) systems by coligand modifications.
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DOI：
10.1021/ic802066a
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发表时间：
2009-02
影响因子：
4.6
通讯作者：
Jiongpeng Zhao;Bo-wen Hu;E. Sañudo;Qian Yang;Yong-Fei Zeng;X. Bu
中科院分区：
文献类型：
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作者：
Jiongpeng Zhao;Bo-wen Hu;E. Sañudo;Qian Yang;Yong-Fei Zeng;X. Bu
通过使用一系列具有不同取代基的苯甲酸酯作为共配体，成功地合成了三种新的叠氮铜化合物[Cu（benzoate）（N（3））]（n）（1），[Cu（2-methyl-benzoate）（N（3））]（n）（2）和[Cu（1-naphthoate）（N（3））]（n）（3），并对其结构和磁性进行了表征.单晶结构分析表明，苯甲酸酯中的非配位取代基对配合物的结构有很大影响。在已知的羧酸盐/叠氮端混合桥联铜体系中，配合物1表现出孤立的铁磁链，具有最大的Cu-N-Cu夹角，而配合物2和3是二维配位聚合物，分别含有mu-（1，1，3，3）和mu-（1，1，3）桥联叠氮，并表现出新的叠氮铜网络，拓扑结构分别为（4（4））和（4.8（2））。此外，2是通过自发拆分得到的手性配合物。在低温范围内，2和3都表现出自发磁化，具有软铁磁性，相变温度分别为13和10 K。
Through the use of a series of structurally related benzoates bearing different substituents as coligands, three new azido-copper compounds, [Cu(benzoate)(N(3))](n) (1), [Cu(2-methyl-benzoate)(N(3))](n) (2), and [Cu(1-naphthoate)(N(3))](n) (3), have been successfully obtained and structurally and magnetically characterized. Single-crystal structure analyses indicated that the uncoordinating substituents in the benzoates greatly affect the structure of the complexes. Complex 1 displays isolated ferromagnetic chains with the largest Cu-N-Cu angle in known carboxylate/end-on-azido mixed-bridged copper systems, while complexes 2 and 3 were 2D coordination polymers, containing mu-(1,1,3,3) and mu-(1,1,3) bridging azides and exhibiting new azido-copper networks with (4(4)) and (4.8(2)) topologies, respectively. Furthermore, 2 was a chiral complex obtained through spontaneous resolution. In the low-temperature range, both 2 and 3 showed spontaneous magnetization with characteristics of soft ferromagnetic magnetism with phase transition temperatures of 13 and 10 K, respectively.