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A Fluorescent 18-Crown-6 Based Luminescence Sensor for Lanthanide Ions

✍ Scribed by Wen-Sheng Xia; Russell H. Schmehl; Chao-Jun Li

Publisher
Elsevier Science
Year
2000
Tongue
French
Weight
104 KB
Volume
56
Category
Article
ISSN
0040-4020

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✦ Synopsis

AbstractÐThe synthesis and photophysical behavior of a luminescent chemosensor for the early lanthanide elements is described. The sensor is a 1,4-diphenylethynyl-benzene chromophore having 18-crown-6 moieties bound to the outer phenyl rings. The chromophore is luminescent and the emission is quenched by lanthanide (Ln 31 ) ions with larger ionic radii and existing f±f transitions (Ce 31 , Pr 31 and Nd 31 ). Alkali, alkaline earth ions and lanthanides with smaller radii (Ge 31 , Tb 31 , Dy 31 , and Yb 31 ) do not affect the emission.

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Lennard-Jones parameters for La 3 , Nd 3 , Gd 3 , and Yb 3 have been derived by Monte Carlo freeenergy perturbation simulations that correctly reproduce the experimental free energy of hydration in water, modeled as TIP3P, to within 1 % both absolutely and relatively. The radial distribution functio