title: Vibrational, DFT, thermal and dielectric studies on 3-nitrophenol-1,3,5-triazine-2,4,6-triamine (2/1).
abstract: A new organic-organic salt, 3-nitrophenol-1,3,5-triazine-2,4,6-triamine (2/1) (3-NPM) has been synthesized by slow evaporation technique at room temperature. Single crystal X-ray diffraction analysis reveals that 3-NPM crystallizes in orthorhombic system with centrosymmetric space group Pbca and the lattice parameters are a=15.5150(6) Å, b=12.9137(6) Å, c=17.8323(6) Å, α=β=γ=90° and V=3572.8(2)(Å)(3). The geometry, fundamental vibrational frequencies are interpreted with the aid of structure optimization and normal coordinate force field calculations based on density functional theory (DFT) B3LYP/6-311G(d,p) method. IR and Raman spectra of 3-NPM have been recorded and analyzed. The complete vibrational assignments are made on the basis of potential energy distribution (PED). The electric dipole moment, polarizability and the first order hyperpolarizability values of the 3-NPM have been calculated. (1)H and (13)C NMR chemical shifts are calculated by using the gauge independent atomic orbital (GIAO) method with B3LYP method with 6-311G (d,p) basis set. Moreover, molecular electrostatic potential (MEP) and thermodynamic properties are performed. Mulliken and Natural charges of the title molecule are also calculated and interpreted. Thermal decomposition behavior of 3-NPM has been studied by means of thermogravimetric analysis. The dielectric measurements on the powdered sample have been carried out and the variation of dielectric constant and dielectric loss at different frequencies of the applied field has been studied and the results are discussed in detail.
authors.affiliation: Department of Physics, D.G.Vaishnav College, Chennai 600 106, India.
authors.forename: V
authors.initials: V
authors.lastname: Sangeetha
authors.forename: M
authors.initials: M
authors.lastname: Govindarajan
authors.forename: N
authors.initials: N
authors.lastname: Kanagathara
authors.forename: M K
authors.initials: MK
authors.lastname: Marchewka
authors.forename: S
authors.initials: S
authors.lastname: Gunasekaran
authors.forename: G
authors.initials: G
authors.lastname: Anbalagan
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009596:Nitrophenols / Q000737:chemistry*; D011789:Quantum Theory; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014227:Triazines / Q000737:chemistry*
chemical_list: D009596:Nitrophenols; D014227:Triazines; C011907:melamine; C049017:3-nitrophenol
keywords: Dielectric studies; FT-Raman; FTIR; HOMO–LUMO; Thermal analysis