二维氰桥 Fe(II)-M(I/II) 金属有机框架中的自旋交叉和液晶性质。

Spin-crossover and liquid crystal properties in 2D cyanide-bridged Fe(II)-M(I/II) metalorganic frameworks.

机构信息

Institut für Anorganische und Analytische Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany.

出版信息

Inorg Chem. 2010 Nov 1;49(21):10022-31. doi: 10.1021/ic101304v.

DOI:10.1021/ic101304v

PMID:20882966

Abstract

Novel two-dimensional heterometallic Fe(II)-M(Ni(II), Pd(II), Pt(II), Ag(I), and Au(I)) cyanide-bridged metalorganic frameworks exhibiting spin-crossover and liquid crystal properties, formulated as {FeL(2)M(I/II)(CN)(x)}·sH(2)O, where L are the ligands 4-(4-alkoxyphenyl)pyridine, 4-(3,4-dialkoxyphenyl)pyridine, and 4-(3,4,5-trisalkoxyphenyl)pyridine, have been synthesized and characterized. The physical characterization has been carried out by means of EXAFS, X-ray powder diffraction, magnetic susceptibility, differential scanning measurements, and Mössbauer spectroscopy. The 2D Fe(II) metallomesogens undergo incomplete and continuous thermally induced spin transition at T(1/2) ≈ 170 K and crystal-to-smectic transition above 370 K.

摘要

新型二维异金属 Fe(II)-M(Ni(II), Pd(II), Pt(II), Ag(I), 和 Au(I)) 氰桥联金属有机骨架，具有自旋交叉和液晶性质，其分子式为{FeL(2)M(I/II)(CN)(x)}·sH(2)O，其中 L 是配体 4-(4-烷氧基苯基)吡啶、4-(3,4-二烷氧基苯基)吡啶和 4-(3,4,5-三烷氧基苯基)吡啶。这些配合物已经被合成并进行了表征。通过 EXAFS、X 射线粉末衍射、磁化率、差示扫描测量和穆斯堡尔光谱对其进行了物理特性的研究。二维 Fe(II)金属有机配合物在 T(1/2)≈170 K 处经历不完全和连续的热诱导自旋转变，并在高于 370 K 处发生晶体到向列相的转变。