A convenient route to synthesize 1,2,4-triazolo[1,5-a]pyrimidine derivatives and their one and two-photon absorption spectral properties

作者:Wang, Hongli*; Xu, Wenyuan; Dai, Yi; Zhang, Bin; Wu, Qiongyou; Wang, Dingli; Zhang, Mingzhi; Tian, Min; Wu, Hong
来源:Journal of Heterocyclic Chemistry, 2007, 44(5): 993-997.
DOI:10.1002/jhet.5570440502

摘要

A convenient method for synthesizing alpha-(1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonyl)methane derivatives, 3 and 4, by the well known Knoevenagel reaction, in one step, is described. The two chromophores are stilbene-type chromophores containing the same D-pi-A structures and end-capped with aromatic group as their donors. Measured with femtosecond multipass Ti:sapphire amplifier as irradiation source (pumped by the laser at 800 nm), the two chromophores show efficient two-photon induced orange red fluorescence emission. The experimental results indicate that the numbers of branches of the two chromophores affect their one-photon properties and two-photon up-conversion emission behaviors, and with the increasing numbers of branches, their wavelengths of lambda(abs)(max), lambda(spf)(max) and lambda(tpf)(max) exhibit bathochromic shifts.