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Issue 14, 2007
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Design of high efficiency for two-photon polymerization initiator: combination of radical stabilization and large two-photon cross-section achieved by N-benzyl 3,6-bis(phenylethynyl)carbazole derivatives

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Abstract

Novel A–π–D–π–A V-shaped 3,6-bis(phenylethynyl)carbazole based chromophores were designed and synthesized as two-photon polymerization (TPP) initiators combining a large two-photon absorption cross-section with facilitated radical formation. 9-Benzyl-3,6-bis(4-nitrophenylethynyl)carbazole (4d) shows a strong two-photon absorption around 800 nm and exhibits very high two-photon polymerization initiating sensitivity with a threshold power of 0.8 mW at the concentration of 0.18 mol%, which is much lower than the threshold power of 6.37 mW found for benzil. The corresponding threshold of laser exposure intensity for TPP is 3.0 × 107 mJ cm−2. The lowest loading of 4d is up to 0.012 mol% with a threshold power of 3.2 mW.

Graphical abstract: Design of high efficiency for two-photon polymerization initiator: combination of radical stabilization and large two-photon cross-section achieved by N-benzyl 3,6-bis(phenylethynyl)carbazole derivatives

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Publication details

The article was received on 16 Nov 2006, accepted on 20 Dec 2006 and first published on 15 Jan 2007


Article type: Paper
DOI: 10.1039/B616792F
Citation: J. Mater. Chem., 2007,17, 1433-1438
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    Design of high efficiency for two-photon polymerization initiator: combination of radical stabilization and large two-photon cross-section achieved by N-benzyl 3,6-bis(phenylethynyl)carbazole derivatives

    J. Xing, W. Chen, J. Gu, X. Dong, N. Takeyasu, T. Tanaka, X. Duan and S. Kawata, J. Mater. Chem., 2007, 17, 1433
    DOI: 10.1039/B616792F

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