Thermal and electrical properties of tetrakis(alkylseleno)tetrathiafulvalenes (TSeC sub n -TTF, n = 1-18)
- Institute for Molecular Science, Okazaki (Japan)
Thermal and electrical properties have been investigated for tetrakis(alkylseleno)tetrathiafulvalenes, which consist of a TTF {pi} system and four alkylseleno substitutional groups with n carbon atoms (abbreviated as TSeC{sub n}-TTF (n = 1-18)). The linear n dependences of the enthalpy and entropy changes at the melting point, {Delta}H{sub m} and {Delta}S{sub m}, are observed, which is consistent with the usual behavior of flexible molecules. The n dependence of the melting points, in addition to those of {Delta}H{sub m} and {Delta}S{sub m}, suggests that the series of TSeC{sub n}-TTFs is divided into 2 subgroups with respect to n. In one subgroup with smaller n, n < 6, the intermolecular interactions between adjacent selenium-substituted TTF moieties dominate the crystal structures, while, in the other subgroup with n {>=} 6, the van der Waals intermolecular interaction associated with alkyl chain groups works to reduce the interplanar distances between adjacent TTF moieties in the crystal, and consequently, in the latter subgroup, it is also suggested that the electrical conductivities are enhanced by the increased overlaps between adjacent TTF {pi} systems through the reduction of the interplanar distances.
- OSTI ID:
- 7108501
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Journal Issue: 15 Vol. 93:15; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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