Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1236167 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2011 | 9 Pages |
Quantum chemical calculations of energies, geometrical structural parameters, harmonic and anharmonic frequencies of 2,4-DCP and 4,6-DCP were carried out by HF and density functional theory methods with 6-311++G(d,p) as basis set. The assignment of each normal mode has been made using the observed and calculated frequencies, their IR and Raman intensities. A detailed interpretation of the FT-IR and FT-Raman spectra of 2,4-DCP and 4,6-DCP was reported on the basis of the calculated potential energy distribution (PED). A comparison of theoretically calculated vibrational frequencies at B3LYP/6-311++G(d,p) with FT-IR and FT-Raman experimental data shows good agreement between them. Natural atomic charges of 2,4-DCP and 4,6-DCP were calculated and compared with pyrimidine molecule.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Geometrical structural parameters of 2,4-DCP and 4,6-DCP were carried out. ► Harmonic and anharmonic frequencies were carried out by HF and DFT methods. ► FT-IR and FT-Raman spectra were recorded and PED calculations were reported. ► Experimental data shows good agreement with theoretical data. ► Pyrimidine derivatives have more biological activities such as anticancer.