New 1,6-heptadienes with pyrimidine bases attached: Syntheses and spectroscopic analyses

The absorption and emission properties of these pyrimidine derivatives (3-6) were studied in solvents of different physical properties. Computerized analysis and multiple regression techniques were applied to calculate the regression and correlation coefficients based on the equation that relates peak position λmax to the solvent parameters that depend on the H-bonding ability, refractive index, and dielectric constant of solvents.