(伪-DT-TTF)2[Au(mnt)2]: A Weakly Disordered Molecular Spin-Ladder System
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- 作者：Rafaela A. L. Silva ; Ana I. S. Neves ; Elsa B. Lopes ; Isabel C. Santos ; Joana T. Coutinho ; Laura C. J. Pereira ; Concepci贸 Rovira ; Manuel Almeida ; Dulce Belo
- 刊名：Inorganic Chemistry
- 出版年：2013
- 出版时间：May 6, 2013
- 年：2013
- 卷：52
- 期：9
- 页码：5300-5306
- 全文大小：368K
- 年卷期：v.52,no.9(May 6, 2013)
- ISSN：1520-510X
文摘
The synthesis and characterization of (伪-DT-TTF)2[Au(mnt)2] is reported. The magnetic properties of this new salt show that it is still a rare example of an organic spin-ladder. (伪-DT-TTF)2[Au(mnt)2] shares the same ladder structure of the DT-TTF and ETT-TTF analogues, and its room temperature conductivity is 2 S/cm. Despite the observed donor orientation disorder associated with the thiophenic sulfur atoms, the intermolecular interactions between donor units, calculated using the extended H眉ckel approximation and a double-尉 basis set, show that the interaction values do not depend on the configuration of the sulfur atom on the thiophenic ring. The insensitivity of the spin-ladder magnetic properties to the donor molecular disorder in (伪-DT-TTF)2[Au(mnt)2] is a direct consequence of the negligible contribution of the disordered thiophenic sulfur atom to the HOMO. In the related donor ETT-TTF, this contribution is significant and destroys the magnetic interactions, and no spin-ladder is observed. This compound not only enlarges the number of organic spin-ladder systems in this series of closely related compounds but also provides an interesting example of weakly disordered molecular spin-ladder system.