Elsevier, Tetrahedron Letters, 2(49), p. 238-242, 2008
DOI: 10.1016/j.tetlet.2007.11.078
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The synthesis of a novel bis-crown quinoxalino[2′,3′:9,10]phenanthro[4,5-abc]phenazine discotic and its binding properties to a series of alkali and alkaline-earth metals is reported. A schematic representation of the binding equilibrium of the sensor to the metal is proposed. The binding constant of the sensor to barium(II) was estimated to be 1.4×104M−1 based on 1H NMR studies.