Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 100, Issue 24, Pages 13752-13754Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2333806100
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A rotationally resolved electronic spectrum of the gas-phase dimer 2-aminopyridine-2-pyridone, an analog of the adenine-thymine base pair, has been observed and assigned, leading to precise measurements of its moments of inertia and preliminary determinations of its structure. A Watson-Crick configuration results, with N...H-N and N-H...O hydrogen bond lengths of 2.898 and 2.81o Angstrom, respectively. The two bases are found not to be coplanar; a dihedral angle of 6.1degrees between the base planes is also estimated from the measured moments of inertia. Possible chemical and biological implications of these results are discussed.
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