Your browser doesn't support javascript.
loading
Guanine Tautomerism in Ionic Complexes with Ag+ Investigated by IRMPD Spectroscopy and Mass Spectrometry.
Cruz-Ortiz, Andrés F; Molina, Franco L; Maitre, Philippe; Pino, Gustavo A.
Afiliação
  • Cruz-Ortiz AF; INFIQC (CONICET-UNC), Ciudad Universitaria, Pabellón Argentina, X5000HUA Córdoba, Argentina.
  • Molina FL; Departamento de Fisicoquímica, Fac. de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Pabellón Argentina, X5000HUA Córdoba, Argentina.
  • Maitre P; Centro Láser de Ciencias Moleculares, Universidad Nacional de Córdoba, Ciudad Universitaria, Pabellón Argentina, X5000HUA Córdoba, Argentina.
  • Pino GA; INFIQC (CONICET-UNC), Ciudad Universitaria, Pabellón Argentina, X5000HUA Córdoba, Argentina.
J Phys Chem B ; 125(26): 7137-7146, 2021 07 08.
Article em En | MEDLINE | ID: mdl-34165305
In this paper, we present the IRMPD spectra of three ionic complexes between guanine (G) and silver (Ag+): [GAg-H2O]+, [GAgG]+ produced in the electrospray ionization source of the mass spectrometer, and [GAg]+ produced by collision induced dissociation of the [GAgG]+ complex. On the basis of the comparison of theoretically calculated IR spectra, we show that there are two isomers of each complex containing two different keto-amino (KA) tautomers of G (GKA(1,9) and GKA(1,7)). The observed isomers are the most stable structures in aqueous solution, and their experimentally estimated relative populations are in better agreement with the calculated relative populations in solution than in the gas phase, both at 298 K. We concluded that these observations suggest that GKA(1,9) and GKA(1,7) coexist in solution according to previous theoretical reports (Colominas, C.; et al. J. Am. Chem. Soc. 1996, 118, 6811). We were unable to find any evidence of the presence of the GEA(9), GKA(3,7), GKA(3,9), or GKA(7,9), whose relative stabilities in solution are strongly dependent on the theoretical method used to account for the solvent effect (Hanus, M.; et al. J. Am. Chem. Soc. 2003, 125, 7678).
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Prata / Guanina Idioma: En Revista: J Phys Chem B Assunto da revista: QUIMICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Argentina País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Prata / Guanina Idioma: En Revista: J Phys Chem B Assunto da revista: QUIMICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Argentina País de publicação: Estados Unidos