Molecular structure of 8-hydroxy-1-methylquinolinium iodide hydrate in crystal and solution

Molecular structure, vibrational spectra, NLO and NBO analysis of bis(8-oxy-1-methylquinolinium) hydroiodide

In this paper, quantum chemistry calculations of geometric parameters, harmonic vibrational wavenumbers, molecular frontier orbital energies (HOMO and LUMO) and the electronic properties of bis(8-oxy-1-methylquinolinium) hydroiodide ([(C(10)H(9)NO)(2)H(+)]·I(-)) have been performed by using Gaussian 09 program. The structural and spectroscopic data of the molecule in the ground state have been calculated by using Hartree-Fock (HF) and density functional method (DFT/B3LYP) with the LanL2DZ basis set. For the spectra predicted, a potential energy distribution (PED) is calculated. The (1)H and (13)C nuclear magnetic resonance (NMR) chemical shifts values of bis(8-oxy-1-methylquinolinium) hydroiodide molecule have been calculated by the gage including atomic orbital (GIAO) method. Furthermore, molecular electrostatic potential maps (MEP), Mulliken charges and the natural bonding orbital (NBO) analysis of the compound have been calculated by the HF and B3LYP/Lanl2DZ methods.

Molecular structure, vibrational and chemical shift assignments of 8-hydroxy-1-methylquinolinium iodide hydrate by density functional theory (DFT) and ab initio Hartree-Fock (HF) calculations

The molecular geometry, the normal mode frequencies and corresponding vibrational assignments, (1)H and (13)C NMR chemical shift values of 8-hydroxy-1-methylquinolinium iodide monohydrate [(C(10)H(10)NO)(+)I(-)H(2)O] in the ground state were performed by HF and B3LYP levels of theory using the LanL2DZ basis set. The optimized bond lengths and bond angles are in good agreement with the X-ray data. The vibrational spectra of the title compound which is calculated by HF and DFT methods, reproduces vibrational wave numbers and intensities with an accuracy which allows reliable vibrational assignments. The title compound [(C(10)H(10)NO)(+)I(-)H(2)O] have been studied theoretically in the 4, 000-200 cm(-1) region and the assignment of all the observed bands were made. The analysis of the infrared spectra indicates that there are some structure-spectra correlations. These methods are proposed as a tool to be applied in the structural characterization of 8-hydroxy-1-methylquinolinium iodide monohydrate [(C(10)H(10)NO)(+)I(-)H(2)O], and thus providing useful support in the interpretation of experimental NMR data.