机构地区: 海南师范大学化学与化工学院
出 处: 《海南师范大学学报(自然科学版)》 2009年第2期164-169,共6页
摘 要: 在Na4PW11O39Fe(Ⅲ)(H2O)·11H2O,K4Fe(CN)6和Bu4NBr的混合水溶液中,合成了一个新的类普鲁士蓝杂多化合物[Bu4N]28[(PW11O39FeⅢ)6FeⅡ (CN)6]·13H2O,并通过元素分析、差热-热重、红外光谱、紫外光谱等分析手段对其进行了表征.分析结果表明,在该化合物中,PW11O39Fe(Ⅲ)(H2O)4-的配位水分子被氰基取代,形成以FeII为中心的类似于普鲁士蓝的八面体结构单元FeII-[CN-FeⅢPW11O39]6.磁性研究表明,该化合物为反铁磁性物质,在3.44K以上,其表现为铁磁性,磁化率随温度的下降而升高,居里常数为4.469cm3Kmol-1,外斯常数为-0.05(3)K,g因子为2.02.在3.44K以下,其表现为反铁磁性,磁性随温度的下降而降低. A new type of PB analogue heteropolycompound [Bu4N]28[(PW11O39Fe^Ⅲ)6Fe^Ⅱ(CN)6]·13H2O was synthesized by the reaction of Na4PW11O39Fe^(Ⅲ)(H2O)·11H2O, K4Fe (CN)6 and BuaNBr in an aqueous solution. It was characterized by element analysis, TG-DTG, IR and UV. There exists a similar octahedron structure Fe^Ⅱ-[CN-Fe^ⅢPW11O39]6 to Prussian Blue in the new compound. Investigations to this compound in magnetic properties show an antiferromagnetism. At the temperature above 3.44K, the compound behaves like a ferromagnetism with an increase of molar susceptibility as the temperature was lowered. The Curie constant is 4.469 cm^3Kmol^-1 and the Weiss constant is -0.05 (3)K with a factor g of 2.02. Whereas at the temperature below 3.44K, the effective moment declines with a decrease of temperature, behaving as a dominant antiferromagnetie interaction.