Self-Assembly of the Hexabromorhenate(IV) Anion with Protonated Benzotriazoles: X-ray Structure and Magnetic Properties

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• 作者：Jos茅 Mart铆nez-Lillo ; John Kong ; Miguel Julve ; Euan K. Brechin
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：November 5, 2014
• 年：2014
• 卷：14
• 期：11
• 页码：5985-5990
• 全文大小：416K
• ISSN：1528-7505

文摘

Two novel Re^IV compounds of formulas [HBTA]₂[Re^IVBr₆] (1) and [HMEBTA]₂[Re^IVBr₆] (2) [BTA = 1H-benzotriazole and MEBTA = 1-(methoxymethyl)-1H-benzotriazole] have been synthesized and magneto-structurally characterized. 1 and 2 crystallize in the triclinic system with space group P1虆. In both compounds, the rhenium ion is six-coordinate, bonded to six bromo ligands in a regular octahedral geometry. Short Re^IV鈥揃r路路路Br鈥揜e^IV contacts, 蟺鈥撓€ stacking, and H-bonding interactions occur in the crystal lattice of both 1 and 2, generating novel supramolecular structures based on the Re^IV. The different dispositions of the cations and the intermolecular Br路路路Br contacts in 1 and 2 play an important structure鈥損roperty role, with the magnetic properties of 1 and 2 revealing a significant antiferromagnetic coupling between Re^IV ions through intermolecular Br路路路Br interactions. In 1, these interactions account for a maximum in the magnetic susceptibility at ca. 10 K.