Temperature dependence of spectroscopic properties of isolated polydiacetylene chains strained by their monomer single crystal matrix

Sylvie Spagnoli (1) , Jeanne Berrehar , Jean-Louis Fave (2) , Michel Schott (2)

1 LIPhy - Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères]
2 INSP - Institut des Nanosciences de Paris

The temperature dependence of exciton absorption and Raman frequencies of polydiacetylene (PDA) isolated chains is studied for 3BCMU and 4BCMU chains dispersed in their respective monomer crystal matrix. While isolated 3BCMU chains are practically unstrained, and behave as typical high quality bulk PDA, isolated 4BCMU chains are under a compression that increases as T decreases and show a very different behaviour. A simple model of chain deformation and its effect on the exciton energy is proposed, which qualitatively accounts for all the results. (c) 2007 Elsevier B.V. All rights reserved.

Mots clés: diacetylene crystals; isolated polydiacetylene chains; absorption Raman spectroscopy; strained polymer chains

Domaines: Matière Condensée [cond-mat]

Sylvie Spagnoli, Jeanne Berrehar, Jean-Louis Fave, Michel Schott. Temperature dependence of spectroscopic properties of isolated polydiacetylene chains strained by their monomer single crystal matrix. Chemical Physics, 2007, 333 (2-3), pp.254-264. ⟨10.1016/j.chemphys.2007.02.009⟩. ⟨hal-01281497⟩