A highly turn-on fluorescent CHEF-type chemosensor for selective detection of Cu2+ in aqueous media

Siham Slassi; Mohammed Aarjane; Abdelkrim El-Ghayoury; Amina Amine

doi:10.1016/j.saa.2019.02.099

A highly turn-on fluorescent CHEF-type chemosensor for selective detection of Cu²⁺ in aqueous media

Spectrochim Acta A Mol Biomol Spectrosc. 2019 May 15:215:348-353. doi: 10.1016/j.saa.2019.02.099. Epub 2019 Feb 28.

Authors

Siham Slassi¹, Mohammed Aarjane¹, Abdelkrim El-Ghayoury², Amina Amine³

Affiliations

¹ LCBAE, Equipe Chimie Moléculaire et Molécules Bioactives, Faculté des Sciences Université Moulay Ismail, BP 11201 Zitoune, Meknes, Morocco.
² Université d'Angers, CNRS UMR 6200, Laboratoire MOLTECH-Anjou, 2 bd Lavoisier, 49045 Angers Cedex, France.
³ LCBAE, Equipe Chimie Moléculaire et Molécules Bioactives, Faculté des Sciences Université Moulay Ismail, BP 11201 Zitoune, Meknes, Morocco. Electronic address: amine_7a@yahoo.fr.

PMID: 30852282
DOI: 10.1016/j.saa.2019.02.099

Abstract

An efficient "turn on" fluorescence chemosensor Schiff base LH based on the combination of 2-Hydroxy-5-(p-tolyldiazenyl)benzaldehyde and N-(3-Aminopropyl)imidazole was prepared and characterized then evaluated for its selective fluorescent sensing of Cu²⁺ amongst other metal ions. The CN isomerization inhibition process induced by the Cu²⁺ binding warrants the chelation-induced enhanced fluorescence (CHEF) effect. In addition, the detection limit sensing of LH for Cu²⁺ was found to be 1.8 × 10^-6 M that is below the WHO recommendation level (20 μM) for drinking water.

Keywords: CHEF effect; Cu(2+) sensor; Fluorescent chemosensor; High selectivity; Schiff base; Turn-on.