A flexible urea-functionalized receptor bearing two p-nitrobenzene units was designed and synthesized from the reaction of precursors 4-nitrophenyl isocyanate and 1,2-bis(2?-aminophenoxy) benzene. The receptor was cha...A flexible urea-functionalized receptor bearing two p-nitrobenzene units was designed and synthesized from the reaction of precursors 4-nitrophenyl isocyanate and 1,2-bis(2?-aminophenoxy) benzene. The receptor was characterized by 1H NMR, MS, FTIR and elemental analysis, and the crystal structure of the receptor was determined by X-ray diffraction analysis. The crystal belongs to the orthorhombic system, space group Pca21 with a = 12.740(2), b =14.133(3), c = 15.842(3)A, V = 2852.4(9) A3, Z = 4, Mr = 620.57, Dc = 1.445 g/cm3, F(000)= 1288,= 0.0585 and wR = 0.1032 for 3177 observed reflections(Ⅰ> 2σ(Ⅰ)), and R = 0.1304 and wR =for all data. The results show that the receptor displays selective recognition ability for H2PO4– in DMSO with a series of anions using UV-Vis absorption spectra technique. Furthermore, the coordination reaction of the receptor with H2PO4– was investigated via UV-Vis spectra and 1 H NMR.The stoichiometric ratio and the association constant(Ka) of the coordination reaction were obtained as well.展开更多
基金supported by the Joint Project of Science and Technology Department of Guizhou Province(LH[2017]7256 and [2017]5788)
文摘A flexible urea-functionalized receptor bearing two p-nitrobenzene units was designed and synthesized from the reaction of precursors 4-nitrophenyl isocyanate and 1,2-bis(2?-aminophenoxy) benzene. The receptor was characterized by 1H NMR, MS, FTIR and elemental analysis, and the crystal structure of the receptor was determined by X-ray diffraction analysis. The crystal belongs to the orthorhombic system, space group Pca21 with a = 12.740(2), b =14.133(3), c = 15.842(3)A, V = 2852.4(9) A3, Z = 4, Mr = 620.57, Dc = 1.445 g/cm3, F(000)= 1288,= 0.0585 and wR = 0.1032 for 3177 observed reflections(Ⅰ> 2σ(Ⅰ)), and R = 0.1304 and wR =for all data. The results show that the receptor displays selective recognition ability for H2PO4– in DMSO with a series of anions using UV-Vis absorption spectra technique. Furthermore, the coordination reaction of the receptor with H2PO4– was investigated via UV-Vis spectra and 1 H NMR.The stoichiometric ratio and the association constant(Ka) of the coordination reaction were obtained as well.
