Publication: The nonlinear refraction and nonlinear absorption in 4-(4,6-diaminopyrimidin-2-ylthio) substituted double-decker Lu(III) phthalocyanine
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Date
2008
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PERGAMON-ELSEVIER SCIENCE LTD
Abstract
A 4-(4,6-diaminopyrimidin-2-ylthio) substituted double-decker Lu(III) phthalocyanines (4) have been prepared and characterized by elemental analysis, IR, LIV-vis and H-1 NMR spectroscopies. The nonlinear refractive index, nonlinear absorption and the optical limiting (OL) performance of the compound 4 in a 0.5 mm spectroscopic cell in DMF solution were investigated by using 4 ns pulse laser at 532 nm. Z-scan experiments have been conducted between 0.24 and 2.39 GW/cm(2) peak intensities for 10 Hz repetition rate and also between 2.39 and 23.89 GW/cm2 peak intensities for 1 Hz repetition rate. The thermal effect contributes to the nonlinear response of the material higher than 0.72 GW/cm(2) peak intensity at 10 Hz. We measured the effective nonlinear refractive index of the material as 1.2 x 10(-11) esu at 3.5 x 10(-4) M concentration with the peak intensity less than 0.72 GW/cm(2) and we found that nonlinear absorption was very small. On the other hand, when concentration is increased to 2.4 x 10(-3) M material's nonlinear absorption becomes dominant mechanism for the nonlinear response and the compound 4 indicates OL behavior at 2.4 x 10(-3) M concentration. (C) 2007 Elsevier Ltd. All rights reserved.
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Keywords
organometallic compounds, chemical synthesis, optical properties, SANDWICH DILUTETIUM TETRAPHTHALOCYANINE, Z-SCAN TECHNIQUE, ELECTROCHEMICAL PROPERTIES, OPTICAL NONLINEARITIES, SINGLE-BEAM, COMPLEXES, PORPHYRIN, LIGAND, IONS