Spin Frustration in an Organic Radical Ion Salt Based on a Kagome-Coupled Chain Structure

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• 作者：Lars Postulka ; Stephen M. Winter ; Adam G. Mihailov ; Aaron Mailman ; Abdeljalil Assoud ; Craig M. Robertson ; Bernd Wolf ; Michael Lang ; Richard T. Oakley
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：August 31, 2016
• 年：2016
• 卷：138
• 期：34
• 页码：10738-10741
• 全文大小：368K
• 年卷期：0
• ISSN：1520-5126

文摘

Electro-oxidation of the quinoidal bisdithiazole BT in dichloroethane in the presence of [Bu₄N][GaBr₄] affords the 1:1 radical ion salt [BT][GaBr₄], crystals of which belong to the trigonal space group P3. The packing pattern of the radical cations provides a rare example of an organic kagome basket structure, with S = 1/2 radical ion chains located at the triangular corners of a trihexagonal lattice. Magnetic measurements over a wide temperature range from 30 mK to 300 K suggest strongly frustrated AFM interactions on the scale of J/k_b ∼ 30 K, but reveal no anomalies that would be associated with magnetic order. These observations are discussed in terms of the symmetry allowed magnetic interactions within and between the frustrated layers.