Simple excited state intramolecular proton transfer (ESIPT) based probe for pH and selective detection of copper(II) ion in aqueous alkaline environment: Sensitivity, selectivity and logic behavior
作者:Awad I. Said、Nikolai I. Georgiev、Vladimir B. Bojinov
DOI:10.1016/j.jphotochem.2023.115176
日期:2024.1
A low molecular weight ESIPT-based probe was synthesized and tested for detecting pH, cations, and anions in aqueous solutions. The probe exhibited a good emission in water due to aggregation induced by π-π* stacking. It gave an “off–on” fluorescent response to higher pHs because of blocking the non-radiative ESIPT after deprotonating phenolic hydroxyl groups. Moreover, the fluorescence emission of
Cocrystallization of two tautomers: 4-(1-{[4-(dimethylamino)benzylidene]hydrazono}ethyl)benzene-1,3-diol and 6-[(<i>E</i>)-1-{[4-(dimethylamino)benzylidene]hydrazino}ethylidene]-3-hydroxycyclohexa-2,4-dien-1-one (1/1)
Two different tautomeric forms of a new Schiff base, C17H19-N3O2 center dot C17H19N3O2, are present in the crystal in a 1: 1 ratio, namely the enol-imine form 4-(1-[4-(dimethylamino)benzylidene]hydrazono}ethyl)benzene-1,3-diol and the keto-amine form 6-[(E)-1-[4-(dimethylamino)benzylidene]hydrazino}ethylidene]-3-hydroxycyclohexa-2,4-dien-1-one. The tautomers are formed by proton transfer between the hydroxy O atom and the imine N atom and are hydrogen bonded to each other to form a one-dimensional zigzag chain along the crystallographic b axis via intermolecular hydrogen bonds.
Exploring the synthesis, molecular structure and biological activities of novel Bis-Schiff base derivatives: A combined theoretical and experimental approach
作者:Sana Gul、Aftab Alam、Zainab、Mohammad Assad、Ahmed A. Elhenawy、Mohammad Shahidul Islam、Syed Adnan Ali Shah、Zahida Parveen、Tanzeela Ahmad Shah、Manzoor Ahmad