biostudies-literatureUnknown11(58)Dey SKSeveral salicylidene-based colorimetric and fluorimetric anion sensors are known in the literature. However, our ¹H-NMR experimental results (in DMSO-d₆) showed hydrolysis of imine (-N[double bond, length as m-dash]CH-) bonds in salicylidene-based receptors (SL, CL1 and CL2) in the presence of quaternary ammonium salts (<i>n</i>-Bu₄N⁺) of halides (Cl^- and Br^-) and oxo-anions (H₂PO₄ ^-, HSO₄ ^- and CH₃COO^-). The mono-salicylidene compound CL1 showed the most extensive -N[double bond, length as m-dash]CH- bond hydrolysis in the presence of anions. In contrast, the di-salicylidene compound CL2 and the tris-salicylidene compound SL showed comparatively slRSC advances36850-36858https://www.ebi.ac.uk/biostudies/studies/S-EPMC9043535biostudies-literatureRevisiting salicylidene-based anion receptors.PMC9043535Dey SKJaniak CKumari SHarmalkar SSMhaldar SNMandrekar SfalseRevisiting salicylidene-based anion receptors.Several salicylidene-based colorimetric and fluorimetric anion sensors are known in the literature. However, our ¹H-NMR experimental results (in DMSO-d₆) showed hydrolysis of imine (-N[double bond, length as m-dash]CH-) bonds in salicylidene-based receptors (SL, CL1 and CL2) in the presence of quaternary ammonium salts (<i>n</i>-Bu₄N⁺) of halides (Cl^- and Br^-) and oxo-anions (H₂PO₄ ^-, HSO₄ ^- and CH₃COO^-). The mono-salicylidene compound CL1 showed the most extensive -N[double bond, length as m-dash]CH- bond hydrolysis in the presence of anions. In contrast, the di-salicylidene compound CL2 and the tris-salicylidene compound SL showed comparatively sl2021-01-01T00:00:00Z2021 Nov2025-04-26T15:21:23.877Z2025-04-06T14:51:52.384ZS-EPMC90435353549435510.1039/d1ra07677a