REMARKABLE NLO RESPONSE AND INFRARED-ABSORPTION IN SIMPLE TWISTED MOLECULAR PI-CHROMOPHORES

Computational modeling reveals that, by substitutional modification of interplanar dihedral angles in a series of quinopyrans, both the opti cal absorption cross section and the first hyperpolarizability can be widely tuned in both frequency and magnitude. This is a promising stru ctural control scheme for modulating molecular nonlinear optical and i nfrared absorption properties. The maximum nonresonant mu beta estimat ed for a tetraalkyl-substituted 4-quinopyran, the full AM1-optimized i nterplanar dihedral angle of which is 104 degrees, is similar to 70000 x 10(-48) esu, at an excitation energy of 0.10 eV. This is 4 orders o f magnitude larger than that of the archetypical NLO chromophore, 4-N, N'-(dimethyIamino)-4'-nihostilbene, at the same excitation frequency. The effects of conjugation pathway, strength of the electron donor/acc eptor groups, and auxiliary donor and acceptor on the molecular respon se properties have also been analyzed. The optical absorption at a twi st angle of 90 degrees, when the molecule can be described as two disj oint pi-subfragments, exhibits characteristic absorptions from the ind ividual subfragments and also inter-subfragment excitation; the former occur at high energies and with high oscillator strengths, while the latter occurs at low energy and with low oscillator strength.