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 [Bu<sub>4sub>N][GaBr<sub>4sub>] affords the 1:1 radical ion salt [BT][GaBr<sub>4sub>], 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<sub>bsub> ∼ 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.