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Protonated hexaazamacrocycle [M•H]+ is able to detect K+ ions present at ppb level in methanolic solutions containing 10−5 M of Na+ ions. The high sensitivity and selectivity of [M•H]+ for K+ is ascribed to the favorable energy balance between the K+ ion desolvation and its coordination to the [M•H]+ macrocycle, which allows the formation of the corresponding adduct before the Coulombic explosion...
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