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A series of rhenium(I) surfactant complexes of general formula fac -[Re(CO) 3 (bpy)(L)]PF 6 (bpy = 2,2‘-bipyridine, L = 4-(4‘-octadecyloxyphenylazo)pyridine (L1), 4-(4‘-octadecyloxyphenylstilbazole)pyridine (L2), 4-(4‘-octadecyloxyphenylethynyl)pyridine (L3)) were synthesized and characterized, and their photophysical and photochemical properties studied. The X-ray crystal structure of the complex fac -[Re(CO) 3 (bpy)(L1)]PF 6 has been determined. The formation and optical properties of these complexes in Langmuir−Blodgett (LB) films were studied by surface pressure−area (π− A ) isotherms and UV−visible and luminescence spectroscopy. Their second-harmonic generation (SHG) behavior has also been investigated. These Re(I) surfactant complexes were shown to exhibit first-order hyperpolarizabilities comparable to, and in some cases slightly higher than, those of their organic analogues.
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Yam et al. (1999) studied this question.
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