SYNTHESIS, PHOTOPHYSICS, PHOTOCHEMISTRY, ELECTROCHEMISTRY AND STRUCTURAL STUDIES OF LUMINESCENT RHENIUM(I) SURFACTANT COMPLEXES - NONLINEAR-OPTICAL PROPERTIES IN LANGMUIR-BLODGETT-FILMS

A series of structurally related rhenium(I) tricarbonyl diimine surfac tant-active complexes, [Re(CO)(3)(diimine){py(CH2)(n)CH3}](+) and [Re( CO)(3)(diimine){pyCO(Chol)}](+) have been synthesized (n = 0, 1, 4, 12 , 14, 16, 18; py = pyridyl, Chol = cholesteryl), and their photophysic al, photochemical and electrochemical properties studied. A systematic study on the dependence of their photophysical properties in differen t environments has also been presented. In general, there is no appare nt change in the photophysical behavior of these complexes as a functi on of the chain length of the surfactant type pyridyl ligands, the mec hanism of which has been discussed. Langmuir-Blodgett films of the com plexes have been prepared, and their pi-A isotherms, together with the ir electronic absorption and emission properties studied. The second h armonic generation (SHG) properties of the LB films have also been inv estigated. The X-ray crystal structure of a surfactant rhenium(I) comp lex, [Re(bpy)(CO)(3)(pyC(17)H(35))]ClO4 has been determined.