LANGMUIR-BLODGETT-FILMS OF BIS(STEARYL PYRIDINE-4-CARBOXYLATE)(PHTHALOCYANINATO)IRON(II)

A Langmuir-Blodgett (LB) film is made from an axially-substituted bis( stearyl pyridine-4-carboxylate)(phthalocyaninato)iron(II) ((SP4C)(2)Fe (II)Pc). The two hydrocarbon long chain ligands provide the species wi th monolayer-forming ability and successfully prevent intermolecular i nteraction between the phthalocyanine molecules in the film, though ha ving a negative effect on the molecular orderliness. This is the first example of a phthalocyanine LB film in which the phthalocyanine molec ules are not aggregated. While the LB film of(SP4C)(2)Fe(II)Pc is sile nt in voltammetric studies, an adsorbed film of the same species on gr aphite exhibits two reversible redox couples within the water limits, attributed to the SP4C)(2)(FePC)-P-III(2-)](+)/(SP4C)(2)FE(II)Pc(2-) a nd (SP4C)(2)FE(II)Pc(2-)/[(SP4C)(2)FE(I)Pc(2-)](-) processes, respecti vely. The (SP4C)(2)FE(II)Pc LB film can be oxidized by chlorine gas bu t is relatively stable to the attack of H2O2 and OCl-.