Journal
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
Volume 85, Issue 10, Pages 1844-1849Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0036024411100293
Keywords
cyclodextrins; lumichrome; lumazine; uracil; thermodynamics of complexation
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Funding
- Russian Foundation for Basic Research [09-03-97563]
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Interactions of alpha- and beta-cyclodextrins with lumichrome and its structural fragments, lumazine and uracil, were studied by means of solubility and 1H NMR spectroscopy. alpha-Cyclodextrin was found to have a weak complexing ability toward the studied compounds. It was established that beta-cyclodextrin forms stable complexes with lumichrome and does not complex with lumazine and uracil. It was shown that only the benzene ring of lumichrome penetrates the beta-cyclodextrin cavity, leading to a substantial increase in the solubility of lumichrome in water. We concluded that beta-cyclodextrin complexation with lumichrome is highly exothermic due to the van der Waals interactions and hydrogen bonding between polar groups of the reagents.
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