title: Molecular structure and vibrational assignment of melaminium phthalate by density functional theory (DFT) and ab initio Hartree-Fock (HF) calculations.
abstract: The molecular geometry, the normal mode frequencies and corresponding vibrational assignment of melaminium phthalate (C3H7N6+.C8H5O4(-)) in the ground state were performed by HF and B3LYP levels of theory using the 6-31G(d) basis set. The optimized bond length numbers with bond angles are in good agreement with the X-ray data. The vibrational spectra of melaminium phthalate which is calculated by HF and B3LYP methods, reproduces vibrational wave numbers with an accuracy which allows reliable vibrational assignments. The title compound has been studied in the 4000-100 cm(-1) region where the theoretical evaluation and assignment of all observed bands were made.
authors.affiliation: Kocaeli Universitesi, Fen Edebiyat Fakültesi Fizik Bölümü, Umuttepe Kampüsü, 41380 Izmit, Turkiye.
authors.forename: Erdoğan
authors.initials: E
authors.lastname: Tarcan
authors.forename: Ozgü
authors.initials: O
authors.lastname: Altindağ
authors.forename: Davut
authors.initials: D
authors.lastname: Avci
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Atalay
mesh_terms: D002244:Carbon / Q000737:chemistry*; D003627:Data Interpretation, Statistical; D006860:Hydrogen Bonding; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D008956:Models, Chemical; D015233:Models, Statistical; D008968:Molecular Conformation; D015394:Molecular Structure; D010795:Phthalic Acids / Q000737:chemistry*; D015203:Reproducibility of Results; D013053:Spectrophotometry / Q000379:methods; D013055:Spectrophotometry, Infrared / Q000379:methods; D014227:Triazines / Q000032:analysis* / Q000737:chemistry*; D014965:X-Rays
chemical_list: D010795:Phthalic Acids; D014227:Triazines; C533171:melaminium phthalate; C030011:carbene; D002244:Carbon; C011907:melamine; D008697:Methane