Synthesis and Characterization of Chromate Cu(Ⅱ)/Ni(Ⅱ) Chain Complexes

doi:10.7503/cjcu20120733

Abstract

Abstract:

Two new one-dimensional chain complexes, (NH₄)₂[Cu(NH₃)₂(CrO₄)₂](1) and (NH₄)₂·[Ni(NH₃)₂(CrO₄)₂](2), were obtained by mixing copper nitrate or nickel nitrate with the same molar of ammonium dichromate in ammonia water at room temperature, and they were characterized by single-crystal X-ray diffraction(XRD), thermogravimetric analysis(TGA) and differential thermal analysis(DTA). Furthermore, the complexes were magnetically characterized by temperature-dependent magnetic susceptibility, field-dependent magnetization, and alternate current(AC) magnetic measurements. The structure analysis results show that crystals of both complexes are triclinic, space group P1 with a=0.59090(12) nm, b=0.6929(3) nm, c=0.73740(15) nm, α=107.03(4)°, β=92.79(3)°, γ=112.44(2)° for Cu(Ⅱ) complex and a=0.56987(7) nm, b=0.69972(9) nm, c=0.73335(8) nm, α=104.929(3)°, β=96.7121(3)°, γ=112.325(4)° for Ni(Ⅱ) complex. In the crystal structure, the [M(NH₃)₂]²⁺ units are linked by two chromato bridges, forming an eight-member ring. As a whole, both complexes have one-dimensional chain structures. The two complexes began to break down as the temperature gradually reached 150 ℃ or so, leaving behind H₂Cr₂CuO₅ and H₂Cr₂NiO₅, and afterwards they are dehydrated at above 410 ℃. The temperature-dependent magnetic susceptibilities were measured in the range of 2—300 K, which implies a weak antiferromagnetic interaction between the adjacent mental ions. The field-dependent magnetization and AC magnetic measurements indicate that the two complexes are both antiferromagnets.

Key words: One-dimensional(1D) structure, Coordination polymer, Crystal structure, Thermal analysis, Magnetic characterization

CLC Number:

O614

TrendMD:

CAI Liang-Yuan, QI Qi, YANG Chun, JIANG Shan, JIANG Qian, WANG Qing-Lun, REN Hong-Xia. Synthesis and Characterization of Chromate Cu(Ⅱ)/Ni(Ⅱ) Chain Complexes[J]. Chem. J. Chinese Universities, 2013, 34(3): 520.

References

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