Parametrization of the Magnetic Behavior of the Triangular Spin Ladder Chains Organically Templated: (C2N2H10)[M(HPO3)F3] (MIII = Fe,

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• 作者：Sergio Ferná ; ndez-Armas ; José ; L. Mesa ; José ; L. Pizarro ; Juan Modesto Clemente-Juan ; Eugenio Coronado ; Marí ; a I. Arriortua ; and Teó ; filo Rojo
• 刊名：Inorganic Chemistry
• 出版年：2006
• 出版时间：April 17, 2006
• 年：2006
• 卷：45
• 期：8
• 页码：3240 - 3248
• 全文大小：379K
• 年卷期：v.45,no.8(April 17, 2006)
• ISSN：1520-510X

文摘

A new iron(III) phosphite templated by ethylenediamine has been synthesized using solvothermal conditions underautogenous pressure. The (C₂N₂H₁₀)[Fe(HPO₃)F₃] compound has been characterized by single-crystal X-ray diffractiondata and spectroscopic and magnetic techniques. The crystal structure is formed by chains extended along the caxis and surrounded by ethylenediammonium cations. A study by diffuse-reflectance spectroscopy has beenperformed, 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 thermalevolution of the intensity of the ESR signals indicates the existence of antiferromagnetic interactions for the Fe^IIIphase. The magnetic susceptibility data of the Cr^III and V^III compounds show antiferromagnetic couplings. TheJ-exchange parameters of the Fe^III and Cr^III compounds have been calculated by using a model for a triangularspin 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 J₁= -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 hasbeen performed considering a linear chain with the magnetic parameters D = 2.5 cm^-1 and J = -1.15(1) K.