Diaza-18-crown-6 appended with two 5-chloro-8-hydroxyquinoline groups
can serve as an effective chemosensor for Mg2+. The modified macrocycl
e will fluoresce in the presence of Mg2+ but not with other alkaline e
arth ions at pH 7.2. Mg2+ concentrations can be measured in the presen
ce of Na2+, K+, Ca2+, Sr2+ and Ba2+. (C) 1998 Elsevier Science Ltd. Al
l rights reserved.