Aqueous solubilities and enthalpies of solution of adenine and guanine |
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Authors: | Howard DeVoe Stanley P Wasik |
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Institution: | (1) Chemical Thermodynamics Division, Center for Chemical Physics, National Bureau of Standards, 20234 Washington, DC;(2) Present address: Department of Chemistry, University of Maryland, 20742 College Park, MD |
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Abstract: | A generator column—liquid chromatographic technique was used to determine the aqueous solubility of adenine from 20 to 30°C, and of guanine from 15 to 40°C. The 95% confidence limits of the solubilities and molar enthalpies of solution at 25°C are: 8.7±0.1×10–3M and 33.5±0.5 kJ-mol–1 for adenine; 3.9±0.1×10–5M and 49.2±0.6 kJ-mol–1 for guanine. the adenine enthalpy value includes a small correction for association in the saturated solutions. The previously undetermined molar enthalpy of the second ionization step of guanine (to form the doubly-charged guanine anion) is estimated from our data combined with other measurements to equal 33.8±2.9 kJ-mol–1. |
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Keywords: | Adenine guanine aqueous solubility generator column molar enthalpy of solution |
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