摘要:
Three novel triazine derivatives, (E)-4-(2-(4,6-dimethyl-1,3,5-triazin-2-yl)vinyl)- N,N-di-p-tolylaniline (a), 4,4'-((1E,1'E)-(6-methyl-1,3,5-triazine-2,4-diyl) bis(ethene-2,1-diy))bis(N,N-di-p-tolylaniline) (b), and 4,4',4"-((1E,1'E,1''E)-(1,3,5- triazine-2,4,6-triyl)tris(ethene-2,1-diyl))tris(N,N-di-p-tolylaniline) (c), were designed and synthesized. Their photophysical and photochemical properties were investigated systematically including single-photon absorption, nonlinear optical absorption (NOA) and up-converted fluorescence. Interestingly, the compound a with single branch showed pure three-photon absorption phenomenon, while the corresponding b and c indicated two-photon induced excited-state absorption properties, showing strong structure-dependence relationship. The results offer a method to design and synthesize organic molecules for multiphoton materials. It was noted that the three-photon cross-section value (delta(3)) of a was up to 1.35 x 10(-76) cm(6) s(2). Correspondingly, the two-photon (delta(2)) and excited-state cross-section (delta(e)) values of b and c also were obtained, and value of them were 485 GM and 1.03 x 10(-17) cm(2) for b, and 1100 GM and 1.27 x 10(-18) cm(2) for c, respectively. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.