TY - JOUR
T1 - Structure phase transition and magnetic property of halide-bridged copper(II) complexes
AU - Cui, Ai Li
AU - Sato, Osamu
AU - Kou, Hui Zhong
PY - 2009/9/1
Y1 - 2009/9/1
N2 - 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).
AB - 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).
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M3 - Article
AN - SCOPUS:70749127382
SN - 0251-0790
VL - 30
SP - 1687
EP - 1690
JO - Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities
JF - Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities
IS - 9
ER -