Fig. 5
The specific recognition of TU-1 to PO and DBU to COS in TU-1/DBU pair via hydrogen-bonding interaction. a 1H NMR spectra of TU-1, TU-1/COS (1/excess), TU-1/PO (1/60), b 1H NMR spectra of DBU, DBU/COS (1/excess), DBU/ PO (1/1), 0.5 M TU-1 (DBU) in CDCl3
