Abstract

The spectral behaviors of 4-<i>n</i>-pentyl-4′-cyanobiphenyl (5CB) have been studied by means of temperature-dependent Raman spectros-copy in the range between −70 and 70 °C. The <i>ν</i>(C≡N) bands in the Raman spectra were found splitting below the transition temperature from the solid to the nematic liquid crystalline phase at ∼24 °C, suggesting the existence of solid crystalline polymorphism. The interfacial structures of 5CB on metal plate surfaces have been reexamined by surface-enhanced Raman scattering (SERS) at different temperatures. On Ag and Au, the asymmetric shapes of the <i>ν</i>(C≡N) bands suggest that there should exist different binding schemes for 5CB on metal surfaces. These asymmetric bands in the <i>ν</i>(C≡N) stretching region were found to vary in changing temperature.

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