title: Density functional theory studies on molecular structure, vibrational spectra and electronic properties of cyanuric acid.
abstract: The present work has been carried out a combined experimental and theoretical study on molecular structure, vibrational spectra and NBO analysis of cyanuric acid. The FT-IR (100-4000cm(-1)) and FT-Raman spectra (400-4000cm(-1)) of cyanuric acid were recorded. In DFT methods, Becke's three parameter exchange-functional (B3) combined with gradient-corrected correlation functional of Lee, Yang and Parr (LYP) by implementing the split-valence polarized 6-31G(d,p) and 6-31++G(d,p) basis sets have been considered for the computation of the molecular structure optimization, vibrational frequencies, thermodynamic properties and energies of the optimized structures. The density functional theory (DFT) result complements the experimental findings. The electronic properties, such as HOMO-LUMO energies and molecular electrostatic potential (MESP) are also performed. Mulliken population analysis on atomic charges is also calculated. The first order hyperpolarizability (βtotal) of this molecular system and related properties (β, μ and Δα) are calculated using DFT/B3LYP/6-31G (d,p) and B3LYP/6-311++G(d,p) methods. The thermodynamic functions (heat capacity, entropy and enthalpy) from spectroscopic data by statistical methods were also obtained for the range of temperature 50-1000K.
authors.affiliation: Department of Physics, Aksheyaa College of Engineering, Puludivakkam, Kanchipuram-Dt., Tamil Nadu, India; PG and Research Department of Physics, Pachaiyappa's College, Chennai, India. Electronic address: mprabhaharan@hotmail.com.
authors.forename: M
authors.initials: M
authors.lastname: Prabhaharan
authors.affiliation: PG and Research Department of Physics, Pachaiyappa's College, Chennai, India.
authors.forename: A R
authors.initials: AR
authors.lastname: Prabakaran
authors.affiliation: PG and Research Department of Physics, Presidency College (Autonomous), Chennai, India.
authors.forename: S
authors.initials: S
authors.lastname: Srinivasan
authors.affiliation: Research & Development Center, St. Peter's University, Chennai, India.
authors.forename: S
authors.initials: S
authors.lastname: Gunasekaran
mesh_terms: D004583:Electrons; D008958:Models, Molecular; D008968:Molecular Conformation; D017711:Nonlinear Dynamics; D055620:Optical Phenomena; D011789:Quantum Theory; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D055672:Static Electricity; D013816:Thermodynamics; D014227:Triazines / Q000737:chemistry*; D014732:Vibration
chemical_list: D014227:Triazines; C004632:cyanuric acid
keywords: Cyanuric acid; FT-Raman; FTIR; HOMO–LUMO; MEP; NBO