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    Spectroscopic Characterization and Langmuir-Blodgett Films of a Novel Azopolymer Material

    Year: 2007

    Journal: Langmuir, 2007, 23 (4), pp 1804–1809, 20111221

    Authors: Marta Haro, Daniel J. Ross, Luís Oriol, Ignacio Gascón, Pilar Cea, Maria Carmen López, and Ricardo F. Aroca

    Organizations: Departamento de Química Orgánica-Química Física, Facultad de Ciencias, Plaza de San Francisco, Ciudad Universitaria, 50009 Zaragoza, Spain, and Materials and Surface Science Group, School of Physical Science, University of Windsor, Windsor, Ontario, Canada N9B 3P4

    Spectroscopic characterization and fabrication of Langmuir and Langmuir−Blodgett (LB) films of an azopolymer−pyridine (PAzPy) are reported. UV−visible absorption and fluorescence spectra, Fourier transform infrared (FTIR) spectra, and Raman spectra were recorded. The vibrational assignment of the observed spectra is supported by a complete geometry optimization, followed by vibrational frequency and intensity computations of both the trans and cis forms of the monomer (AzPy) using density functional theory at the B3LYP 6-31G(d,p) level of theory. Langmuir monolayers of the polymer (PAzPy) were formed at the water−air interface, and LB films of high quality were formed onto solid substrates. The polymer LB films were investigated by surface-enhanced Raman scattering.