In conclusion, a copper(II) complex of the chalcone ligand has
been synthesized. The copper(II) centre in the complex was found
to be reduced by nitrite ion in presence of water in acetonitrile and
methanol solution. Simultaneous oxidation of the nitrite to nitrate
was observed and the water was found as the source of oxygen.
This reduction methodology has been utilized to develop fluorescence
based selective sensor for nitrite ion.