Yaroslav Prostota, O. Kachkovsky, L. V. Reis
Feb 1, 2013
Citations
0
Influential Citations
41
Citations
Journal
Dyes and Pigments
Abstract
Abstract The reaction of squaric acid with excess 3-methylimidazo[1,5-a]pyridine afforded almost exclusively the corresponding semisquaraine. The later underwent condensation with several heterocyclic compounds possessing active methyl groups, forming a novel class of unsymmetrical squaraines. The spectral properties of the obtained dyes were investigated and quantum-chemical calculations were performed to examine the dependence of the electronic structure and electron transitions on the molecular constitution of the dyes. The oxygen-generation ability of the new dyes was accessed by the 1,3-diphenylisobenzofuran (DPBF) quenching method, envisioning their potential use as sensitizers for photodynamic therapy (PDT).