Synthesis, Crystal Structure and Magnetic Properties of an Oxalato- and Oxamido-bridged One-dimensional Mn(Ⅱ)-Cu(Ⅱ) Complex

doi:10.3969/j.issn.0251-0790.2012.05.005

Abstract

Abstract: A new complex, [Cu(L)(H₂O)Mn(C₂O₄)]·4H₂O(H₂L=1,4,8,11-tetraazacyclotetradecane-2,3-dione), was synthesized and structurally characterized by X-ray diffraction. The complex crystallizes in monoclinic space group P2₁/n with a=0.97471(5) nm, b=0.89316(5) nm, c=2.35635(11) nm, β=92.441(2)°, V=2.04951(18) nm³, D_c=1.691 Mg/m³, Z=4, R₁=0.0607, wR₂=0.1915(based on F²). The complex consists of [CuL(H₂O)], Mn(Ⅱ), oxalate and lattice H₂O molecules. Through the alternate oxalate bridges, the Mn(Ⅱ) ions form a zig-zag one-dimensional chain, while the other two coordination sites of the Mn(Ⅱ) ion are occupied by two oxygen atoms from L^2- of [CuL(H₂O)], giving rise to a mixed oxalate- and oxamido-bridged one-dimensional bimetallic complex. Magnetic studies show the presence of antiferromagnetic interaction between the Cu(Ⅱ) and Mn(Ⅱ) ions and between the adjacent Mn(Ⅱ) ions. Best fit to the experimental data by means of MAGPACK software gives the magnetic coupling constant of J_Cu-Mn=-13.1 cm^-1 and J_Mn-Mn=-0.87 cm^-1.

Key words: Oxalate, Oxamidato, Manganese, Copper, Magnetism

CLC Number:

O614

TrendMD:

HU Kong-Qiu, KOU Hui-Zhong. Synthesis, Crystal Structure and Magnetic Properties of an Oxalato- and Oxamido-bridged One-dimensional Mn(Ⅱ)-Cu(Ⅱ) Complex[J]. Chem. J. Chinese Universities, 2012, 33(05): 892.

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Synthesis, Crystal Structure and Magnetic Properties of an Oxalato- and Oxamido-bridged One-dimensional Mn(Ⅱ)-Cu(Ⅱ) Complex

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