Add time:07/14/2019         Source:sciencedirect.com

In the present work, the characterization of 7-(1,3-dioxolan-2-ylmethyl)-1,3-dimethylpurine-2,6-dione (7DDMP26D) molecule was carried out by quantum chemical method and vibrational spectral techniques. The FT-IR (4000–400 cm−1) and FT-Raman (4000–100 cm−1) spectra of 7DDMP26D were recorded in solid phase. The UV–Vis absorption spectrum of the 7DDMP26D was recorded in the range of 200–400 nm. The molecular geometry, harmonic vibrational frequencies and bonding features of 7DDMP26D in the ground state have been calculated by HF and DFT methods using 6-31G(d,p) basis set. The complete vibrational frequency assignments were made by normal coordinate analysis (NCA) following the scaled quantum mechanical force field methodology (SQMF). The molecular stability and bond strength were investigated by applying the natural bond orbital analysis (NBO). The electronic properties, such as excitation energies, absorption wavelength, HOMO and LUMO energies were performed by time-depended DFT (TD-DFT) approach. The other molecular properties like electrostatic potential (ESP), Fukui function and thermodynamic properties of the title compound at different temperatures have been calculated. Finally, the calculation results were analyzed to simulate infrared, FT-Raman and UV spectra of the title compound which shows better agreement with observed spectra.

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