Structural and Magnetic Resolution of a Two-Step Full Spin-Crossover Transition in a Dinuclear Iron(II) Pyridyl-Bridged Compound
作者:Jarrod J. M. Amoore、Cameron J. Kepert、John D. Cashion、Boujemaa Moubaraki、Suzanne M. Neville、Keith S. Murray
DOI:10.1002/chem.200601069
日期:2006.11.6
A dinuclear iron(II) complex containing the new pyridyl bridging ligand, 2,5-di(2',2''-dipyridylamino)pyridine (ddpp) has been synthesised and characterised by single-crystal X-ray diffraction, magnetic susceptibility and Mossbauer spectral methods. This compound, [Fe(2)(ddpp)(2)(NCS)(4)]4 CH(2)Cl(2), undergoes a two-step full spin crossover. Structural analysis at each of the three plateau temperatures
合成了含有新吡啶基桥联配体2,5-二(2',2''-二吡啶基氨基)吡啶(ddpp)的双核铁(II)配合物,并通过单晶X射线衍射,磁化率和莫斯鲍尔光谱法。该化合物[Fe(2)(ddpp)(2)(NCS)(4)] 4 CH(2)Cl(2)经历两步全自旋交叉。在三个高原温度的每个温度下进行的结构分析显示,两个铁(II)中心的双核分子具有自旋态HS-HS,HS-LS和LS-LS(HS:高自旋,LS:低自旋)。这是首次在两步双核铁(II)自旋交联化合物中实现HS-LS有序状态下金属中心的拆分。热重数据表明,可以在两个不同的步骤中于120摄氏度和200摄氏度除去二氯甲烷溶剂化物分子。部分脱溶剂的笼形物[Fe(2)(ddpp)(2)(NCS)(4)] CH(2)Cl(2)经历一步转变,其转变温度相对于a合成材料。该材料的结构表征揭示了每个铁(II)中心配位几何形状的细微变化,以及双核配合物的局部环境的显