Fernández-Armas Sergio, Mesa José L, Pizarro José L, Clemente-Juan Juan Modesto, Coronado Eugenio, Arriortua María I, Rojo Teófilo
Departamento de Química Inorganica, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado 644, E-48080 Bilbao, Spain.
Inorg Chem. 2006 Apr 17;45(8):3240-8. doi: 10.1021/ic051804o.
A new iron(III) phosphite templated by ethylenediamine has been synthesized using solvothermal conditions under autogenous pressure. The (C2N2H10)[Fe(HPO3)F3] compound has been characterized by single-crystal X-ray diffraction data and spectroscopic and magnetic techniques. The crystal structure is formed by chains extended along the c axis and surrounded by ethylenediammonium cations. A study by diffuse-reflectance spectroscopy has been performed, and the calculated Dq, B, and C parameters for the Fe(III) cations are 1030, 720, and 3080 cm(-1), respectively. The Mössbauer spectrum at room temperature is characteristic of Fe(III) ions. The electron spin resonance (ESR) spectra carried out at different temperatures show isotropic signals with a g value of 2.00(1). The thermal evolution of the intensity of the ESR signals indicates the existence of antiferromagnetic interactions for the Fe(III) phase. The magnetic susceptibility data of the Cr(III) and V(III) compounds show antiferromagnetic couplings. The J-exchange parameters of the Fe(III) and Cr(III) compounds have been calculated by using a model for a triangular spin ladder chain. The values are J1 = -1.63(1) K and J2 = -0.87(2) K with g = 2.02 for the Fe(III) phase and J(1) = -0.56(2) K and J2 = -0.40(2) K with g = 1.99 for the Cr(III) compound. In the case of the V(III) phase, the fit has been performed considering a linear chain with the magnetic parameters D = 2.5 cm(-1) and J = -1.15(1) K.
在自生压力下采用溶剂热条件合成了一种以乙二胺为模板的新型亚磷酸铁（III）。通过单晶X射线衍射数据以及光谱和磁性技术对（C₂N₂H₁₀）[Fe（HPO₃）F₃]化合物进行了表征。晶体结构由沿c轴延伸并被乙二铵阳离子包围的链组成。进行了漫反射光谱研究，计算出Fe（III）阳离子的Dq、B和C参数分别为1030、720和3080 cm⁻¹。室温下的穆斯堡尔谱是Fe（III）离子的特征谱。在不同温度下进行的电子自旋共振（ESR）谱显示g值为2.00（1）的各向同性信号。ESR信号强度的热演化表明Fe（III）相存在反铁磁相互作用。Cr（III）和V（III）化合物的磁化率数据显示出反铁磁耦合。通过使用三角自旋梯链模型计算了Fe（III）和Cr（III）化合物的J交换参数。对于Fe（III）相，值为J1 = -1.63（1）K和J2 = -0.87（2）K，g = 2.02；对于Cr（III）化合物，J（1） = -0.56（2）K和J2 = -0.40（2）K，g = 1.99。对于V（III）相，考虑具有磁性参数D = 2.5 cm⁻¹和J = -1.15（1）K的线性链进行了拟合。
