Abstract
Ordered catalytic films containing copper phthalocyanine tetrasulfonate (CuPCTS) and didodecyldimethylammonium bromide (DDAB) were studied by linear dichroism (LD) and reflectance-absorbance infrared spectroscopy (RAIR). Molecular orientations obtained by LD and RAIR showed good agreement. Specific orientations of phthalocyanine and hydrocarbon tails differ depending on whether the films are cast from a solution of CuPCTS (DDA) 4 salt, or an aqueous dispersion of DDAB vesicles and (CuPCTS)Na 4. The vesicles give lamellar liquid crystal films featuring stacked bilayers of the double-chain surfactant. The salt films are not liquid crystalline and do not have surfactant molecules organized into bilayers. Molecular organization of CuPCTS(DDA) 4 salt films appears quite different from the vesicle films. Supramolecular structures of the films influence their performance. For example, in electrochemical catalytic dehalogenation, liquid crystal films transported charge more efficiently than the salt films.
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