English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The synthesis and characterization of a novel florescent chemosensor  1  with two different types of cationic binding sites have been reported in this work, which is a calix[4]crown derivative in 1,3-alternate conformation bearing two 2-phenyl-5-(4-dimethylaminopyenyl)-1,3,4-oxadiazole units. The recognition behaviors of  1  in dichloromethane/acetonitrile solution to alkali metal ions (Na +  and K + ), alkaline earth metal ions (Mg 2+  and Ca 2+ ), and transition metal ions (Co 2+ , Ni 2+ , Zn 2+ , Cd 2+ , Cu 2+ , Mn 2+ , and Ag + ) have been investigated by UV-Vis and fluorescence spectra. The fluorescence of  1  might be quenched selectively by Cu 2+  due to the photo-induced electron transfer mechanism, and the quenched emission from  1  could be partly revived by the addition of Ca 2+  or Mg 2+ ; thus, the receptor  1  might be worked as an on–off switchable fluorescent chemosensor triggered by metal ion exchange.

A Novel Calix[4]Crown-Based 1,3,4-Oxadiazole as a Fluorescent Chemosensor for Copper(II) Ion Detection