Cesium Cyano-Bridged CoII鈥揗V (M = Mo and W) Layered Frameworks Exhibiting High Thermal Durability and Metamagnetism

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• 作者：Koji Nakabayashi ; Szymon Chorazy ; Daisuke Takahashi ; Takaaki Kinoshita ; Barbara Sieklucka ; Shin-ichi Ohkoshi
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：November 5, 2014
• 年：2014
• 卷：14
• 期：11
• 页码：6093-6100
• 全文大小：528K
• ISSN：1528-7505

文摘

Two-dimensional cesium bimetal cyano-bridged assemblies Cs^I₄Co^II[Mo^V(CN)₈]Cl₃ (CsCoMo) and Cs^I₄Co^II[W^V(CN)₈]Cl₃ (CsCoW) were synthesized. The negatively charged and solvent-free {Co^II[M^V(CN)₈]Cl₃}^{4鈥?/sup> (M = Mo, W) coordination layers are separated by Cs+ ions. Themogravimetric measurements show that these compounds reveal high thermal durability up to 523 K (250 掳C), which is due to the absence of solvent molecules in their crystal structures. The magnetic measurements show that CsCoMo and CsCoW are metamagnets showing the field-induced transition from an antiferromagnetic phase with N茅el temperature of 25 K to a ferromagnetic phase, which is observed at high critical magnetic field of 24 kOe at 1.8 K. These originate from antiferromagnetic interactions between ferromagnetically coupled cyano-bridged CoII鈥揗V layers, and the contribution from single-ion anisotropy of CoII.}