A comparative study of symmetrical and unsymmetrical trimethine cyanine dyes bearing benzoxazolyl and benzothiazolyl groups was written by Shi, Quan-Quan;Sun, Ru;Ge, Jian-Feng;Xu, Qing-Feng;Li, Na-Jun;Lu, Jian-Mei. And the article was included in Dyes and Pigments in 2012.Recommanded Product: 2,5-Dimethylbenzoxazole This article mentions the following:
Six sym. and unsym. trimethine cyanine dyes bearing benzothiazolyl and benzoxazolyl groups were synthesized. Their linear optical properties were studied. The variation of hetero atoms play an important role in the spectral properties of the dyes. Sequential replacement of the oxygen atom by the sulfur atom resulted in a change in shade from yellow to purple. In order to understand the relation between the mol. structures and the spectral properties of these dyes, theor. calculations were made using the Gaussian program. Key parameters related to absorption and emission spectra were reported and discussed. In the experiment, the researchers used many compounds, for example, 2,5-Dimethylbenzoxazole (cas: 5676-58-4Recommanded Product: 2,5-Dimethylbenzoxazole).
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Referemce:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem