Fourier-transform infrared and Raman spectra of cysteine dichloride cadmium(II) anion DFT: B3LYP/3-21G(d) structural and vibrational calculations.
The cysteine dichloride cadmium(II) potassium was synthesized and the structural analysis was carried out through the following methods: determination of the C, H, N, S and O contents, thermogravimetry, infrared and Raman spectra. Assuming Cd-S, Cd-O (O-carboxilate) and Cd-N bonds, several hypothetical structures were calculated by means DFT: B3LYP/3-21G(d) quantum mechanical method. The calculations shows that the Cd-S and Cd-N central bonds are favoured in the anion complex formation [Cd(Cys)Cl2]-, being the stabilization energy 55.52 kcal mol(-1) lower than isotopomers with Cd-S and Cd-O central bonds. Features of the infrared and Raman spectra confirm the theoretical structural prediction. Full assignment of the vibrational spectra is proposed based on the DFT procedure, and in order to confirm the C-H, N-H, C-C, C-N, Cd-N, Cd-S and Cd-Cl stretching and the HNH and HCH bending, a normal coordinate analysis based on local symmetry force field for -SC(H2)C-, -CdN(H2)C- and -SCd(Cl2)N- fragments was carried out.
Faget
Grisset
G
Departamento de Química, Pontifícia Universidade Católica do Rio de Janeiro, RJ, Brazil.
Felcman
Judith
J
Giannerini
Tiago
T
Téllez
Claudio A
CA
D000838:Anions / Q000737:chemistry; D019187:Cadmium Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D003545:Cysteine / Q000031:analogs & derivatives* / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry; D015394:Molecular Structure; D009584:Nitrogen / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013816:Thermodynamics; D014732:Vibration
D000838:Anions; D019187:Cadmium Compounds; D002244:Carbon; D006859:Hydrogen; D003545:Cysteine; D009584:Nitrogen; D010100:Oxygen