Synthesis and characterization of a covalently bound self-assembled macrocycle monolayer thin film for nonlinear optical materials

摘要

Abstract: Synthesis and characterization of covalently bound self-assembled 5,10,15,20-Tetra(4-pyridyl)-21H,23H-porphine (TPyP) monolayer superlattices on various oxide surfaces such as fused silica, glass or silicon are described. The monomolecular thin film structures are characterized by UV-visible ($lambda$-max$/ $EQ 447 nm) and FTIR-ATR spectroscopy. In addition, x-ray photoelectron spectroscopy (XPS) and secondary ion mass spectroscopy (SIMS) studies are used to confirm the formation of a self-assembled monolayer on the fused-silica surface. Attractive features in these complexes are their second-order nonlinear optical properties, which are enhanced by the completely delocalized $pi@-electrons. Second harmonic generation measurements have been used to determine the uniformity of the film, the relative and absolute magnitudes of nonzero elements of the nonlinear susceptibility, $Chi$+(2)$/, and the average molecular orientation of the chromophores. !16