Synthesis and anion recognition studies of new oligomethylene bis(nitrophenylureylbenzamide) receptors.

ABSTRACT: A new series of oligomethylene bis(nitrophenylureylbenzamide) receptors were synthesized varying the relative position of the urea and amide groups (ortho4 and meta8) and the length of the oligomethylene chain (C₂ to C₈). An anion recognition study was performed with TBAX salts (X = AcO^-, BzO^-, F^-, H₂PO₄ ^-, and HP₂O₇ ^3-) by UV-vis and ¹H NMR. The flexibility of these receptors allows a cooperative effect of both ureylbenzamide units in the receptors. Noteworthy, the ortho position favored the 1 : 1 stoichiometry in the complexes with the carboxylates. The formation of 2 : 1 receptor-anion complexes with both types of receptors 4 and 8 and

SUBMITTER: Garcia-Elias J 

PROVIDER: S-EPMC9075971 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature