Pyrazolo quinone heterocyclic compounds and metal complex derivatives in the synthesis of cyanine dyes

Abstract

This work describes the synthesis of new pyrazolo quinone heterocyclic derivatives, their metal complexes and relative cyanine dyes. Electronic absorption spectra in ethanol, water and different pH aqueous solutions are reported and commented. The synthesized new cyanine dyes and relative intermediates were identified and structurally characterized by elemental analysis, IR, 1H-NMR spectroscopies and mass spectrometry. The synthetic approach allowed to tune the physical properties of dyes and provided chromophores useful for analytical chemistry.