The receptor 1 was obtained by the condensation reaction of 8-
hydroxyjulolidine-9-carboxaldehyde and 1-aminonaphthalen-2-ol
with an 80.6% yield in absolute ethanol (Scheme 2). Receptor 1
was characterized by 1H NMR, ESI-mass spectrometry, and elemental
analysis. The photophysical properties of 1 with several
metal ions using their nitrate salts and of 1eCu2þ complex with nine anions in methanol were investigated by UVevis, fluorescence measurements, and titration studies.