Abstract
The influence of pH and structure-breaking anions ClO 4 − on the adsorption of cytosine was studied and compared with the results obtained for adenosine. The a.c. polarograms of acid solutions of cytosine exhibit at higher cytosine concentrations two pits, indicating the region of potentials at which the cytosine molecules are oriented perpendicularly to the electrode surface and associate. At low pH values the reorientation of cytosine molecules from the planar to the perpendicular position can be explained by the interaction of the electric field of the electrode with the protonated N 1 of cytosine. With neutral molecules of cytosine and adenosine the reorientation to the perpendicular position is obviously supported by the interaction of the electric field with the permanent and induced dipole moments of the molecules. The mechanism of adsorption and association of adenosine and cytosine on the negatively charged surface is discussed. ClO 4 − anions disturb the stacking interactions between adsorbed molecules of cytosine and prevent the association.
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