Abstract
We report, a simple synthetic strategy involving C—N and C–C cross-coupling reactions starting with spirobifluorene (SBF) catalyzed by transition metal (Cu and Pd) catalysts. The promising applications of SBF derivatives inspired us to carry out this investigation. Various heterocyclic coupling partners having electron-rich and electron-deficient functionalities (e.g., pyrrole, pyrazole, imidazole, triazole, and phenylboronic acids) are used in this study. The extended conjugation present in the cross-coupling products makes them suitable candidates for fluorescent study. Among the synthesized substrates, spirobifluorene- terphenyl amine (SBF-TA) emission spectra displayed a significant fluorescence enhancement against the Cd(II) ion which has a detection limit of 20 nM.
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