| Abstract
| - New fluorescent chemosensors, 1,8-bis(pyrazolylmethyl)anthracene and 9,10-bis(pyrazolylmethyl)anthracene,were synthesized. The 1,8-isomer showed selective fluorescent quenching effects with Ag(I) and Cu(II). On the otherhand, the 9,10-isomer displayed a selective fluorescentquenching effect only with Ag(I). From the associationconstants obtained from fluorescent titrations and by extraction, we conclude that rigid immobilization of the ligands,1,8-isomer, plays a more important role in the binding withAg(I) than the additional π-cation interaction offered by the9,10-isomer.
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