Structural Organization of π Conjugated Highly Luminescent Molecular Material

Abstract : We report on striking evidence for a room temperature structural phase instability in p-hexaphenyl, inducing a nonplanar conformation of the molecules. Solid state proton NMR and single crystal x-ray diffraction allow the analysis of the organization, the individual dynamics and the involved symmetry breaking. The analysis of Raman spectra above and below room temperature reveals a singular behavior suggesting a modification of the overlap between the electronic wave function induced by the non-planarity. These results provide a new basis to answer fundamental issues related to molecular and electronic materials and, in particular, luminescent organic devices.
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B. Toudic, P. Limelette, G. Froyer, F. Le Gac, A. Moréac, et al.. Structural Organization of π Conjugated Highly Luminescent Molecular Material. Physical Review Letters, American Physical Society, 2005, 95 (21), pp.215502. ⟨10.1103/PhysRevLett.95.215502⟩. ⟨hal-01870053⟩

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