Abstract
Spectral and structural investigation of soluble polydiacetylene monolayer at the air—water interface is carried out using in situ polarized spectroscopy. The coil-like polydiacetylene that is adsorbed two-dimensionally on the water surface is distinguishable from the usual coil form in a solution and film in terms of the position of the absorption peak and the spectral feature. Through the coil-to-rod transition induced by increasing pressure, the linear conjugated backbone of the rigid rod polydiacetylene is gradually packed and remarkably oriented perpendicular to the direction of uniaxial compression. This orientation mechanism is discussed in relation to the preparation of monolayer and the nature of the rigid linear polymer and its coil-to-rod transition.
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