Microsolvation of Building Blocks

Details Microsolvation of Building Blocks Microsolvation of Building Blocks

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..conferc08v&link_type=abstract

"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec

Physics

Microwave

Scientific paper

Laser ablation molecular beam Fourier transform microwave spectroscopy LA-MB-FTMW has provided the first observation of the rotational spectra of the glycine-H_2O complex. As a continuation of this work we present the study of monohydrated complexes of alanine, uracil and thymine and the first observations of the dihydrated clusters glycine-(H_2O)_2 and alanine-(H_2O)_2. For the microsolvated amino acids only the conformer with cis-COOH configuration and bifurcated NH_2\cdotsO=C H-bond has been observed. Both alanine-H_2O and glycine-H_2O have similar shapes: the water molecule being bonded through two O-H\cdotsO hydrogen bonds to the carboxylic group of the amino acid. The dihydrated clusters have also comparable structures where the two water molecules form a cycle with the COOH group through sequential H-bonds. The rotational spectra of uracyl-H_2O and thymine-H_2O show the same complexity than those of the bare molecules due to the hyperfine structure of two quadrupolar ^{14}N atoms. The detected conformers show comparable structures with the water molecule bonded through two N-H\cdotsO and O-H\cdotsO=C hydrogen bonds to the N bases. The structure of hydrogen bond has been investigated by isotopic substitution.
J.L. Alonso, E.J. Cocinero, A. Lesarri, M.E. Sanz and J.C. López, Angew. Chem. 45, 3471 (2006)
V. Vaquero, M.E. Sanz, J.C. López and J.L. Alonso,J. Phys. Chem. A111, 3443 (2007)
J.C. López, M.I. Peña, M.E. Sanz and J.L. Alonso, J. Chem. Phys. 126, 191103 (2007)

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