Structure phase transition and magnetic property of halide-bridged copper(II) complexes

Ai Li Cui, Osamu Sato, Hui Zhong Kou

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Abstract

Halide-bridged one-dimensional Cu(II) halide complexes [(CH3)2CHNH3] CuBr3-xClx (x=0-3) have been synthesized and magnetically studied. Magnetic measurements show that χmT value decreases with the decrease of the temperature, revealing the presence of overall antiferromagnetic interaction in the complexes. Above certain temperature, χmT value shows abrupt increase, originating from the occurrence of structure phase transition at the temperature(Tc=341 K). The Cu(II) ion adopts enlarged octahedral structure, different from the square pyramidal structure in the low-temperature phase. The Tc value for complexes [(CH3)2CHNH3] CuBr3-xClx (x=1, 2) is lower than that of [(CH3)2CHNH3] CuCl3, which is due to the presence of comparatively weak Cu-Br bonds in former compounds. Possible structures of [(CH3)2CHNH3] CuBr3-xCl3 (x=1, 2) have been proposed by comparing the magnetic properties of [(CH3)2CHNH3] CuX3 (X-=Br- or Cl-) with [(CH3)2CHNH3] CuBr3-xClx (x=1, 2).

Original languageEnglish
Pages (from-to)1687-1690
Number of pages4
JournalGaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities
Volume30
Issue number9
Publication statusPublished - Sep 1 2009

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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