The structure of uracil: a laser ablation rotational study.
The jet-cooled rotational spectrum of uracil has been investigated using laser ablation molecular beam Fourier transform microwave (LA-MB-FTMW) spectroscopy. The quadrupole structure originated by the two 14N nuclei of uracil has been completely resolved and assigned. This provides a definitive method to establish the pyrrolic or pyrimidinic nature of the N nuclei and allows us to conclude that the observed tautomer of uracil in the gas phase is the diketo form. From the rotational constants of the isotopic species detected, a structure of uracil has been determined.
Vaquero
Vanesa
V
Grupo de Espectroscopía Molecular, Departamento de Química Física y Química Inorgánica, Universidad de Valladolid, 47005 Valladolid, Spain.
Sanz
M Eugenia
ME
López
Juan C
JC
Alonso
José L
JL