Abstract
A series of benzoxazole-pyridinium salt derivatives with two-photon excited fluorescence performance were synthesized and fully characterized. Among them, compounds 2, 3 and 4 were the isomers with different positions of pyridine N, while compounds 4N, 4S, 4P, 4F and 4B were derived from compound 4 through anion exchanging reaction. Their photophysical properties had been systematically investigated, and the results indicated that the position of pyridine N and the type of anions had a significant influence on their optical properties and bio-imaging application. Transforming the position of pyridine N could affect their fluorescence quantum obviously; the maximum fluorescence quantum is 0.21 for compound 3 in DMF. Meanwhile, we found that the altering anions might be used to regulate their two-photon fluorescence performance, only compounds 4N, 4P and 4B possessed excellent two-photon excited fluorescence emissions, and the highest two-photon cross-section was 1868.69 GM for compound 4B in DMF. In addition, two-photon fluorescence cell imaging experiment demonstrated the potential bio-application of partial compounds with good photostability and low cytotoxicity.
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