Fig. 2: 1H NMR spectral studies.
From: Photoresponsive supramolecular coordination polyelectrolyte as smart anticounterfeiting inks
Partial 1H NMR spectra (DMSO:D2O = 4:1, 400 MHz, 25 °C) of a compound L, b Eu3+-L, c-e Eu3+-L-OF-1: c before and d after the irradiation by UV light (300 nm, 60 min), and e subsequent irradiation with visible light (> 450 nm, 60 min). [Eu3+] = 1.4 × 10-4 M, [L] = [OF-1] = 2.1 × 10−4 M.
