Yang Jun
2007
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Journal
Journal of Beijing University of Chemical Technology
Abstract
A novel molecule with C2v symmetry, 9-benzyl-3,6-bis[2-(pyridine-4-yl)vinyl] carbazole (BPyVC), has been synthesized by the Heck reaction of 4-vinyl pyridine with 9-benzyl-3,6-dibromocarbazole; the latter was obtained by bromination of 9-benzyl carbazole with N-bromosuccinimde. The structure of BPyVC was verified by 1H-NMR, IR and MS. The photophysical properties of BPyVC were investigated in the polymerization of methacrylic acid. Results of two-photon polymerization (TPP) experiments, with 0.09% BPyVC as TPP initiator, showed that the resulting resin exhibited a minimum energy density of 92.7 kJ/cm2 with a scan speed of 22 μm/s, and a that a minimum exposure time of 1.15 ms was required with a light power of 12.7 mW.