Figure 3From: pH-controlled release of auxin plant hormones from cucurbit[7]uril macrocycle1H NMR spectra of 0.4 mM IAA without and with 1.0 equivalent of CB[7]. They were recorded at pH 12.0 (spectra I and II) and pH 1.0 (spectra III and IV). The intensity of the signal marked by the asterisk is four-fold higher than that of the other signals.Back to article page