Sodium: Dibenzo-30-crown-10 aggregates in solution: Na-23 NMR study |
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| Authors: | Harald DH Stöver Luc J Maurice Alfred Delville Christian Detellier |
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| Institution: | Ottawa—Carleton Institute for Chemistry, University of Ottawa Campus, Ottawa K1N 9B4 (Ont.), Canada |
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| Abstract: | (n + 1):n sodium:dibenzo-30-crown-10 complexes are formed in nitromethane solutions. A model based on the coexistence in solution of 1:1, 2:1 and 3:2 complexes can account for the observed Na-23 chemical shifts, transverse and longitudinal relaxation rates. Logarithms of the equilibrium constants of formation at (25±1)°C are (2.1±0.3) and (2.5±0.3) for the 2:1 and 3:2 complexes respectively. The characteristic Na-23 relaxation rates and chemical shifts of the aggregated complexes are compatible with a structure of ion pairs linked by the crown ether. |
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| Keywords: | Author to whom correspondence should be addressed |
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