Theoretical study of the second-order nonlinear optical properties of [N]helicenes and [N]phenylenes

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Abstract

The second-order nonlinear optical properties of helicenes and phenylenes were investigated at the time-dependent Hartee-Fock level using the Austin model 1 (AM1) semiempirical Hamiltonian. Antisymmetric isotropic component of the first hyperpolarizability and its projection on the dipole moment were determined for large helical systems and for their analogs substituted by donor/acceptor pairs. It was found that hyperpolarizability increases monotonically with the size of the system. It was shown that the large differences in the second-order NLO responses exhibit helical systems as a function of the chemical nature of the unit cell, the size of the helix and the position and nature of donor/acceptor substituents.
Original languageEnglish
Pages (from-to)2042-2048
Number of pages7
JournalThe journal of chemical physics
Volume120
Issue number4
Publication statusPublished - 22 Jan 2004

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