Abstract
A systematic comparative study was undertaken of the adsorption and association of thymine (5-methyl uracil) and thymidine (5-methyl deoxyribose uridine) in acid, neutral and alkaline buffer solutions at mercury/solution interfaces by phase-sensitive ac polarography and ac voltammetry. The characteristic properties and adsorption parameters of dilute and compact layers of thymine and thymidine were evaluated from the obtained Frumkin isotherm at different pH values. At elevated bulk concentrations of thymine above a threshold value the stacking interactions between vertically oriented molecules lead to a slow reorientation around E ecm and the molecules adopt a perpendicular stance. The association of the adsorbed molecules of thymidine is hindered and is not effective in promoting base—base stacking interactions, indicating a substantial influence of the different sterical arrangement in the deoxyribose moiety. The results are compared with the similar type of adsorption behaviour of uracil and uridine.
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