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).
|Number of pages||4|
|Journal||Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities|
|Publication status||Published - Sept 1 2009|
All Science Journal Classification (ASJC) codes