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α‐Dithiophene‐tetrathiafulvalene – a Detailed Study of an Electronic Donor and Its Derivatives
Author(s) -
Silva Rafaela A. L.,
Neves Ana I.,
Afonso Mónica L.,
Santos Isabel C.,
Lopes Elsa B.,
Del Pozo Freddy,
Pfattner Raphael,
MasTorrent Marta,
Rovira Concepció,
Almeida Manuel,
Belo Dulce
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201201362
Subject(s) - tetrathiafulvalene , chemistry , stoichiometry , crystallography , crystal structure , single crystal , crystal (programming language) , molecule , organic chemistry , computer science , programming language
The electronic donor α‐DT‐TTF (α‐dithiophene‐tetrathiafulvalene), which among the thiophenic TTF derivatives has remained essentially unexplored, and some of its charge transfer salts are described in detail in this paper. This donor was efficiently prepared by the homocoupling of 5,6‐thieno[2,3‐ d ]‐1,3‐dithiol‐2‐one, and its redox properties are intermediate between those of DT‐TTF (dithiophene‐tetrathiafulvalene) and BET‐TTF [bis(ethylenethio)tetrathiafulvalene]. The crystal structure of α‐DT‐TTF shows a molecular packing composed of trios of donor chains with alternating orientation. This pattern is clearly distinct from those previously found in all other thiophenic TTF donors. Used as an active material in a field‐effect transistor, α‐DT‐TTF presents a mobility μ FE = 5 × 10 –5 cm 2 /V s. The possibility to convert this new donor to conducting charge‐transfer salts with suitable anions was demonstrated by preparing its PF 6 – salts. Two salts with different crystal structures and stoichiometries were identified by X‐ray diffraction studies: (α‐DT‐TTF)(PF 6 ) 0.6 and (α‐DT‐TTF) 2 (PF 6 ). The electrical conductivities of these salts, measured in the single crystal, range from 9 to 50 S/cm at room temperature. In all cases, the salts show a semiconducting behaviour and properties that are comparable to those of the analogous nonaromatic BET‐TTF salts.