Host–Guest Extraction of Heavy Metal Ions with p-t-Butylcalix[8]arene from Ammonia or Amine Solutions

Figure 10

¹H NMR spectra of (a) H₈L at 25°C in CDCl₃ and (b) Cd-H8L at 25°C in CDCl₃ at 400 MHz.

(a)

(b)