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A comprehensive magnetic study of a family of pillar-layered frameworks with analogous Kagomé layers

Long-Fei Wang  Cui-Jin Li  Yan-Cong Chen  Ming-Liang Tong  
【摘要】:Based on the analogous kagomé[Co3(imda)2]layers,a family of pillar-layered frameworks with the formula of[Co3(imda)2(pillar)3]·(pillar)n·x H2O have been successfully synthesized by hydrothermal/solvothermal method(imda=imidazole-4,5-dicarboxylate;for 1,pillar=pyz=pyrazine,n=0,x=8;for 2,pillar=4,4-bpy=4,4-bipyridine,n=1,x=8;for 3,pillar=1,4-dpb=1,4-di(pyridin-4-yl)benzene,n=1,x=13;for 4,pillar=4,4'-dpbp=4,4'-di(pyridin-4-yl)-1,1'-biphenyl,n=1,x=14).Single crystal structral analysis shows an significant increase of the interlayer distances synchronized with the extention of the pillar ligands,namely 7.092(3)(1),10.921(6)(2),14.780(5)(3)and 19.165(4)(4).Despite the wrinkled kagomélayers in complexes 2-4,the comprehensive magnetic characterizations revealed the weaken of interlayer magnetic interactions and the increase of degree of frustration from 1 to 4,which lead to the characteristic magnetic ground states.[1,2]

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