3 interpreted the spectral shifts of the aromatic protons of the phenyl rings linked to the thiourea moiety when adding acetate. It is well known that, two effects might be responsible for the formation of hydrogen bonds betweenthe thiourea subunit and anion. Through-bond effects,which increase the electron density of the benzene ring and promote upfield shifts in 1H NMR spectrum, through-space effects, which polarize C–H bond in proximity to hydrogen bond, create the partial positive charge on the proton and cause downfield shifts [19].As shown in 1H NMR titration spectra of sensor 1 in Fig. 3, upon addition of 0.2 molar equiv of acetate ions, the downfield shift and broadness of the protons Ha and Hb signals (the peaks at 11.749 and 10.062 ppm, respectively) were observed, which indicated the formation of hydrogen bonds between host and guest for two –NH at this stage. And it might be ascribed to through-space effects, polariztion C–H bond in proximity to hydrogen bond. With the further addition of acetate ions, deprotonation of one –NH fragment took place, and the majority of signals on the increase of the electron density on the aromatic rings owing to the through-bond effects. As mentioned above, the proposed anion recognition process was illustrated in