{The right|The proper|The correct|The best|The appropriate|The ideal} substituent, {at the|in the} {right|correct|proper|appropriate|suitable|ideal} {place|location|spot} : predicting the modulation of UV-visible absorption and emission of mono-substituted pyrido[2,{3|three},4-kl]acridines by electron density variations {analysis|evaluation}
DFT and TD-DFT calculations {were|had been|have been} performed to rationalize the {relationship|partnership|connection} {between|in between|among|amongst|involving} UV-Visible absorption and emission spectraand the nature and position of a substituent {on the|around the} heteroaromatic…