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[en] Rotating-frame proton magnetic relaxation times have been measured on powder samples of adenine, guanine and cytosine at temperatures up to 570 K. Evidence for NH2 group C2-axis reorientation has been obtained and the activation energies have been determined. Molecular orbital calculations confirm that the activation energy for NH2 reorientation is significantly lower for guanine than for adenine or cytosine. (orig.)
Journal
Chemical Physics Letters; ISSN 0009-2614; 
; v. 78(3); p. 592-595
; v. 78(3); p. 592-595