Receptor 1 (1.79 mg, 0.005 mmol) was dissolved in methanol
(0.5 mL) and 9 mL of the receptor 1 (10 mM) was diluted to 2.991mL
methanol to make the final concentration of 30 mM.
Cu(NO3)2$2.5H2O (11.6 mg, 0.05 mmol) was dissolved in methanol
(5 mL). 4.5e97.5 mL of the Cu2þ solution (10 mM) were transferred
to the receptor 1 solution (30 mM) prepared above. After mixing
them for a few seconds, UVevis spectra were taken at room
temperature.