FT-IR and FT-Raman spectroscopies and DFT calculations of 2,2-dimethyl-5-(4H-1,2,4-triazol-4-ylaminomethylene)-1,3-dioxane-4,6-dione monohydrate

Article abstract of DOI:10.1016/j.molstruc.2012.12.058

In this work we present a study of the vibrational spectra of 2,2-dimethyl-5-(4H-1,2,4-triazol-4-ylaminomethylene)-1,3-dioxane-4,6-dione monohydrate, C₉H₁₀N₄O₄?H ₂O. The FT-IR and FT-Raman spectra of the crystal were recorded at room temperature in the regions 400-4000 cm^-1 and 50-4000 cm ^-1, respectively. Vibrational wavenumbers and wave vector were predicted using density functional theory calculations with the B3LYP functional and 6-31G(d,p) basis set. The descriptions of the normal modes were made after considering the Potential Energy Distribution (PED). A comparison with experimental spectra allowed us to assign all of the normal modes of the crystal.