7. Conclusion
A simple one pot eco-friendly method for preparation of 4,6-
dimethoxy-2-triazinyl amino acid derivatives were presented. Combined
theoretical and experimental structure-spectroscopic investigationswere
presented. The newly synthesized compounds were characterized by
FTIR, NMR and UV–Vis spectroscopy as well as X-ray single crystal measurements.
The calculated geometric structures using B3LYP/6-
311G(d,p) method agree well with the experimental data. The experimentally
observed electronic transition band showed red shift compared
to the TD-DFT calculated electronic spectra, probably due to solvent effect.
The infrared vibrational spectra of compounds 6a–i were calculated and
their scaled values have high correlation coefficients with the experimental
data (R2=0.9961–0.9995). The fundamental IRmodes were assigned
and described. The stabilization energies due to the ICT interaction from
the carbonyl group to the BD*(1)N8-H28 is very small (0.72 kcal/mol) indicating
weak N–H…O for 6a. The chemical reactivity parameters of the
compounds were predicted using the reactivity descriptors proposed by
Pearson. These important parameters could help to understand different
pharmacological aspects of drug molecules.