Chelation-enhanced fluorescence aqueous solution

Akkaya EU, Huston ME, Czamik AW (1990) Chelation-enhanced fluorescence of anthryla-zamacrocycle conjugate probes in aqueous-solution. J Am Chem Soc 112 3590-3593... 

E. U. Akkaya, M. E. Huston, and A. W. Czarnik, Chelation-enhanced fluorescence of anthry-lazamacrocycle conjugate probes in aqueous solution,./. Am. Chem. Soc. 112, 3590-3593 (1990). 

Chelation-Enhanced Fluorescence of Anthlylazamacrocycle Chemosensors in Aqueous Solution... 

Enantiopure dioctyl-substituted acridino-18-crown-6 ether-type Hgands such as 85, shown in Scheme 30, are potentiometric sensor molecules when incorporated into plasticized PVC membrane electrodes (2009T(A)2795). Another article introduced two acridines 86 as fluorescent chemosensors for and Cd in aqueous solution. These acridines displayed selective chelation-enhanced fluorescence effects with or Cd among the... 

Freeman, Crosby, Lawson (13), Kropp, and Windsor 17, 18) had reported that hydrated europium chloride crystals and aqueous solutions of europium salts, respectively, showed considerable enhancement of ion fluorescence and lifetimes upon substitution of H2O by D2O, the latter workers have reported (37) that wet hydrocarbon solutions of the thenoyltrifluoroacetone chelate of europium showed no enhancement of quantum yield and lifetime upon replacing the H2O present by D2O. They suggested that whereas deuteration enhanced the fluorescent properties of the free ions by inhibiting nonradiative deactivation of the Do level, the quantum efficiency of Do luminescence obtained upon direct excitation of this level (JO, 11) is already so high in the fluorinated diketone chelates e.g. thenoyltrifluoroacetone) that deuteration of the environment should have little further enhancing effect. 

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