Rudresha, B.J.Manjunatha, K.B.Umesh, G.Ramachandra, Bhat, B.2020-03-312020-03-312012Chemical Physics Letters, 2012, Vol.542, , pp.159-163https://idr.nitk.ac.in/handle/123456789/12341The octupolar metal complexes [Zn(bpy)(L)] (1), [Cd(bpy)(L)] (2), [Hg(bpy)(L)] (3) (bpy = 2,2?-bipyridyl, L = 4-dimethylamino-?- cyanocinnamic acid) have been synthesized. The third-order nonlinear optical properties of complexes were studied using Z-scan technique at 532 nm with nanosecond laser pulses. The complexes show optical limiting behavior. The values of the effective two-photon absorption (2PA) coefficients (?), third-order nonlinear susceptibilities (? (3)) and two-photon absorption cross sections (? 2) are calculated. Results show, lewis acidity of metal center and molecular symmetry are two important factors for observed large TPA cross-section of metal complexes. 2012 Elsevier B.V. All rights reserved.Article