Synthesis and characterization of a new class of unsymmetrical squaraines with 2,3-dihydro-1H-perimidine terminal groups
Keywords: Unsymmetrical squaraines; Intramolecular hydrogen bonds; 2,3-dihydro-1H-perimidine; Syn-anti isomerization; 2D NMR-Spectroscopy; 2nd order derivative UV-Vis spectroscopy;