Novel furo[2,3-d] pyrimidine derivative as fluorescent chemosensor for HSO4−

A class of novel heterocyclic compounds 1a–1c has been designed and synthesized. And our initial discovery is that these compounds can effectively recognize HSO4−. With the addition of HSO4−, a new energy band appears at 360–390 nm in the absorption spectra. The emission spectrum (λex = 328 nm) undergoes an important change in its fluorescent effect in the presence of HSO4−. All available data (absorption and emission) strongly support the formation of hydrogen-bonded complexes between 1a and 1c and HSO4−.