Fig. 3. 1H NMR spectra (CDCl3, 700 MHz, 298 K) of P32H (a) and P3Cu (b) and general signal assignment (M = 2H or Cu). Only the aromatic regions of the spectra are shown. The graphs in (a) and (b) correlate the chemical shift and the corresponding T 1 relaxation time of each proton signal. (c) Graph depicts the change in R 1 relaxation rates (R 1 = 1/T 1) between P3Cu and P32H with respect to the distance between the two nuclei, with a fit for ΔR 1 ∝ r –6. The experimental error in ΔR 1 is only evident when T 1 is short (signals j and f).
