title: Pressure-tuning infrared and Raman microscopy study of the DNA bases: adenine, guanine, cytosine, and thymine.
abstract: Diamond-anvil cell, pressure-tuning infrared (IR), and Raman microspectroscopic measurements have been undertaken to examine the effects of high pressures up to about 45 kbar on the vibrational spectra of the four DNA bases, adenine, cytosine, guanine, and thymine. Small structural changes were evident for all the four bases, viz., for adenine and cytosine at 28-31 kbar; for guanine at 16-19 kbar; and for thymine at 25-26 kbar. These changes are most likely associated with alterations in the intermolecular hydrogen-bonding interactions. The pressure dependences of the main peaks observed in the IR spectra of the two phases of guanine lie in the -0.07-0.66 (low-pressure phase) and 0.06-0.91 (high-pressure phase) cm⁻¹/kbar ranges. Also, in the Raman spectra of this nucleoside base, the dν/dP values range from -0.07-0.31 (low-pressure phase) to 0.08-0.50 (high-pressure phase) cm⁻¹/kbar. Similar ranges of dν/dP values were obtained for the other three nucleoside bases.
authors.affiliation: a Department of Chemistry , McGill University , 801 Sherbrooke Street West, Montreal , Quebec , Canada . H3A 2K6.
authors.forename: Seung Yun
authors.initials: SY
authors.lastname: Yang
authors.forename: Ian S
authors.initials: IS
authors.lastname: Butler
mesh_terms: D000225:Adenine / Q000737:chemistry*; D003596:Cytosine / Q000737:chemistry*; D006147:Guanine / Q000737:chemistry*; D008956:Models, Chemical; D015394:Molecular Structure; D011312:Pressure; D013055:Spectrophotometry, Infrared / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013941:Thymine / Q000737:chemistry*
chemical_list: D006147:Guanine; D003596:Cytosine; D000225:Adenine; D013941:Thymine