%0 Journal Article
%T Synthesis, spectroscopic and DFT characterization of 4 汕 -(4-tert-butylphenoxy) phthalocyanine positional isomers for non-linear optical absorption
%A Denisha Gounden
%A Grace N. Ngubeni
%A Jonathan Britton
%A Marcel S. Louzada
%A Nolwazi Nombona
%A Samson Khene
%J -
%D 2017
%X In this work the synthesis, spectral characterization and non-linear optical properties of metal-free 4汕-(4-tert-butylphenoxy) phthalocyanine isomers are described and compared to the previously reported alpha derivative. The second-order nonlinear optical properties of the phthalocyanine isomers were investigated using the Z-scan technique and compared to the theoretical data obtained from density functional theory (DFT) and time dependent density functional theory (TD-DFT) calculations. Z-scan results indicated strong non-linear behaviour, revealing reverse saturable absorption (RSA) profiles for all four isomers. The experimental 汕exp values showed the following trend:C4h (9.31℅10每10mMW每1)>D2h (7.89℅10每10mMW每1)>Cs (7.32℅ 10每10 mMW每1) > C2v (1.77 ℅ 10每10 mMW每1). These results were similar to that obtained with the 4汕-(4-tert-butylphenoxy) phthalocyanines as the C2v and Cs isomers were found to have the lowest 汕exp values compared to other symmetries. The 4汕-(4-tert-butylphenoxy) phthalocyanine C4h isomer was found toshowbetter non-linear optical properties compared to all other isomers.
%K Phthalocyanine
%K non-linear optical absorption
%K density functional theory
%K magnetic circular dichroism
%U https://www.ajol.info/index.php/sajc/article/view/154861