Polydiacetylene Chains Diluted in Their Single Crystal Monomer Matrix: Towards the Isolated Conjugated Chain

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Abstract
Absorption, fluorescence and resonant Raman spectra at 2 or 5 K of polydiacetylene poly4BCMU chains diluted in their single crystal monomer matrix are studied, and discussed in terms of the single conjugated polymer chain electronic properties. Two new electronic transitions are observed below the intense exciton one. Absorption lines are very narrow (≲ 30 cm−1 hwhm). Fluorescence is dominated by emission from the intense exciton state and its origin coincides with that of the absorption. Emission from the two other levels is also detected.