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Issue 12, 2008
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The four polymorphic modifications of the semiconductor dibenzo-tetrathiafulvalene

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Abstract

The organic semiconductor dibenzotetrathiafulvalene (DB-TTF) presents, at ambient conditions, four polymorphic modifications. In addition to the already known monoclinic structure (α) with Z = 2, we have resolved by single crystal X-ray diffraction (XRD) a second crystal structure (β), also monoclinic but with Z = 4. Two other polymorphic modifications (γ and δ) have been found by means of lattice phonon confocal Raman microscopy and XRD. In this paper we present a series of growth experiments, from vapour or from solution, in films and in the bulk phase, describing the variety of transformations which occur among the different phases and their mixing, also at a micrometric scale. Quasi harmonic lattice dynamics calculations satisfactorily reproduce the structures of the α and the β polymorphs and help the phonon assignment of polarized Raman spectra in single crystals.

Graphical abstract: The four polymorphic modifications of the semiconductor dibenzo-tetrathiafulvalene

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Publication details

The article was received on 28 Jun 2008, accepted on 26 Sep 2008 and first published on 15 Oct 2008


Article type: Paper
DOI: 10.1039/B810993A
Citation: CrystEngComm, 2008,10, 1899-1909
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    The four polymorphic modifications of the semiconductor dibenzo-tetrathiafulvalene

    A. Brillante, I. Bilotti, R. G. Della Valle, E. Venuti, S. Milita, C. Dionigi, F. Borgatti, A. N. Lazar, F. Biscarini, M. Mas-Torrent, N. S. Oxtoby, N. Crivillers, J. Veciana, C. Rovira, M. Leufgen, G. Schmidt and L. W. Molenkamp, CrystEngComm, 2008, 10, 1899
    DOI: 10.1039/B810993A

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