摘要
A novel pillared-layer framework with a （52.6）（53.63.73.8） Schlaifli symbol, [Mn（H2O）（Htrc）（Hbtc）]n （1）, was prepared by the reaction of 1,2,4-triazole （Htrz）, 1,3,5-benzene- tricarboxylic acid （H3btc）, and MnII salt and structurally and magnetically characterized. It crystallizes in the orthorhombic system, space group P212121 with a = 7.1618（5）, b = 9.0356（6）, c = 10.9740（13） A, V = 1292.54（15） A3, Dc = 1.799 g/cm3, Mr = 350.15, Z = 4, F（000） = 708, p = 1.064 mm-1, and the final R = 0.0177 and wR = 0.0462 for 2273 observed reflections with I〉 2σ（I）. The unique octahedral Mnn ion in 1 is periodically linked into a two-dimensional （2D） magnetic layer by p2-N1, N4-Htrz and syn, anti-COO of doubly deprotonated Hbtc2- anion, which is further supported by the phenyl backbone of Hbtc2- ligand to generate a 3D pillared-layer framework. Magnetically, complex 1 displays an antiferromagnetic ordering below 5.0 K due to the cooperative antiferromagnetic couplings mediated by the mixed heterobridges within the magnetic layer.
A novel pillared-layer framework with a （52.6）（53.63.73.8） Schlaifli symbol, [Mn（H2O）（Htrc）（Hbtc）]n （1）, was prepared by the reaction of 1,2,4-triazole （Htrz）, 1,3,5-benzene- tricarboxylic acid （H3btc）, and MnII salt and structurally and magnetically characterized. It crystallizes in the orthorhombic system, space group P212121 with a = 7.1618（5）, b = 9.0356（6）, c = 10.9740（13） A, V = 1292.54（15） A3, Dc = 1.799 g/cm3, Mr = 350.15, Z = 4, F（000） = 708, p = 1.064 mm-1, and the final R = 0.0177 and wR = 0.0462 for 2273 observed reflections with I〉 2σ（I）. The unique octahedral Mnn ion in 1 is periodically linked into a two-dimensional （2D） magnetic layer by p2-N1, N4-Htrz and syn, anti-COO of doubly deprotonated Hbtc2- anion, which is further supported by the phenyl backbone of Hbtc2- ligand to generate a 3D pillared-layer framework. Magnetically, complex 1 displays an antiferromagnetic ordering below 5.0 K due to the cooperative antiferromagnetic couplings mediated by the mixed heterobridges within the magnetic layer.
基金
Supported by the National Natural Science Foundation of China (Nos. 20871092, 20973125, 21171129, and 21173157)
Tianjin Educational Committee (2006ZD07)
the Program for New Century Excellent Talents in University (NCET-08-0914)
