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摘要
Hydrothermal reaction of cyano-substituted viologen derivatives and NaN3 with corresponding metal salts in the presence/absence of H(2)PTA (H(2)PTA = rho-phthalic acid) yielded three azide-based polynuclear coordination polymers: [Co-4(N-3)(4)(PTA)(3)(4-CV)(2)](n)center dot 2nH(2)O 3D (1), [Co-4(N-3)(4)(PTA)(3)(3-CV)(2)](n)center dot nH(2)O 3D (2), and [Cu-6(N-3)(14)(4-CV)(2)](n) 2D (3) (3/4-CV+ = 4,4'-bipyridinium-N-methyl-3/4-benzonitrile). The azido bridges are employed to construct two types of polynuclear cluster units: tetranuclear [Co-4(mu(1,1)-N-3)(4)] and hexanuclear [Cu-6(mu(1,1)-N-3)(6)(mu(1,1,1)-N-3)(4)]. Polymers 1 and 2 are isostructural, and exhibit similar 3D frameworks constructed by unprecedented linear tetranuclear Co-4(II) units with a four-connected 6(5)center dot 8 topology. Polymer 3 features a 2D (4,4) topological network built up by hexanuclear Cu-6(II) segments. The azide anion exhibits diverse coordination modes: mu(1,1)-N-3 in 1 and 2, and mu(1,1)-, mu(1,3)-, mu(1,1,1)- and mu(1,1,3)-N-3 in 3. Variable-temperature magnetic susceptibility data denote that 1 and 2 display a weak antiferromagnetic interaction in Co-4(II) units and 3 shows a dominant ferromagnetic exchange in Cu-6(II) units.
- 出版日期2014
- 单位中国科学院大学; 结构化学国家重点实验室; 中国科学院福建物质结构研究所; 南昌航空大学
