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    Molecular switching in nano-structured photochromic films of biopolymers

    Year: 2004

    Journal: Materials Science and Engineering C 23 (2003) 893-896, 20111221

    Authors: B. Mecheri,b, P. Baglioni, O. Pieroni, G. Caminati

    Organizations: a Department of Chemistry and CSGI, University of Florence-Via della Lastruccia 3-50019 Sesto Fiorentino, Florence, Italy b Department of Chemistry, University of Catania-Viale A.Doria 6-95125 Catania, Italy cCNR, Institute of Biophysics-Via San Lorenzo 26-56100 Pisa, Italy

    This paper reports the investigation of the photochromic and conformational behaviour of a poly (L-glutamic acid) (PSG) chemically modified with 85% spiropyran units in the side chains, PSG. We preliminary studied the behaviour of PSG in solution and then we performed a characterisation of the polymer in bidimensional systems. PSG monolayer at the water-air interface was characterised by means of surface pressure-molecular area isotherms and UV-Vis Spectroscopy and the photochromic behaviour was illustrated. Moreover, we transferred, by means of the Langmuir-Blodgett (LB) technique, polypeptide monolayers onto solid support in order to obtain ordered and nano-organized systems whose spectroscopic properties were investigated.