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    題名: Syntheses, Crystal Engineering, and Magnetic Property of a Dicyanamide Bridged Three-Dimensional Manganese(II)−Nitronyl Nitroxide Coordination Polymer Derived from a New Radical
    作者: Lin, Hsin-Huang;Mohanta, Sasankasekhar;Lee, Chin-Jhan;魏和祥;Wei, Ho-hsiang
    貢獻者: 淡江大學化學學系
    日期: 2003-02-13
    上傳時間: 2009-12-01
    出版者: American Chemical Society (ACS)
    摘要: Syntheses, structural characterization, crystal engineering, and variable-temperature magnetic study at fixed field strength of a novel dicyanamide bridged three-dimensional manganese(II)−nitronyl nitroxide compound, [MnII(NIT-tz)(dca)2] (1), (NIT-tz = 2-(2-thiazole)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy-3-oxide, a new Ullman type radical) have been described. The compound crystallizes in the orthorhombic P212121 space group with the following unit cell parameters:  a = 11.015(2) Å, b = 12.6134(14) Å, c = 13.7652(9) Å, and Z = 4. In this complex, the radical behaves as a bidentate chelating ligand, while four single end-to-end dicyanamide (dca) units construct the three-dimensional structure. Inside the structure, there exist diamond-shaped channels, spiral networks, and helical chains. Variable-temperature (5−300 K, 1 T) magnetic susceptibility data reveal the existence of antiferromagnetic interaction in this molecule. The magnetic behavior is explained by considering the exchange-coupled manganese(II)−radical system, which is subjected to the MnII−dca−MnII intermolecular interactions (H = −2JS1·S2 − 2zJ‘〈S〉S). The least-squares fitting of the data results J = −73 cm-1, g = 1.99, and J‘ = −0.17 cm-1 (z = 4).
    關聯: Inorganic chemistry 42(5), pp.1584-1589
    DOI: 10.1021/ic025768u
    顯示於類別:[化學學系暨研究所] 期刊論文

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