On the dipole moments and first-order hyperpolarizability of N, N-bis(4-bromobutyl)-4-nitrobenzenamine

The nonlinear optical molecule N, N-bis(4-bromobutyl)-4-nitrobenzenamine was synthesized. The ground state dipole moment was determined by the Debye–Guggenheim method. A solvent mixture of acetonitrile and toluene was used for the solvatochromic determination of the excited state dipole moment. Excited state has a high value for the dipole moment which indicated a higher degree of charge transfer from the donor to the acceptor moiety on excitation by light. The first hyperpolarizability ( β i j k ) of the molecule was evaluated assuming the two level model of the first hyperpolarizability.