Abstract
Monolayer and multilayer Langmuir-Blodgett (LB) films of the neutral hydrophobic Ir(ppy)[sub 3] (1) (ppy = 2-Phenylpyridine) have been produced on the water surface when mixed with a fatty acid (stearic acid). The molecular area of the complex in the close-packed film is 55 [angstrom][sup 2]. The homogeneity of the films was verified by measuring the absorbance vs the number of layers on a substrate (quartz) and also by comparing the relative emission intensity of multilayer mixed LB films of different molar ratios. The films are stable and capable of being transferred from the water surface onto a substrate with a transfer ratio very close to unity. A blue shift in the maxima of the emission, as the complex concentration is decreased, occurs for both room-temperature fluid solution and a rigid matrix at 77 K. In-trough cyclic voltammetry (horizontal touch) of the mixed film is also reported and compared to the cyclic voltammetry of a film transferred to an indium-tin oxide plate (vertical dip).
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