Organic radical-induced Cu2+ selective sensing based on thiazolothiazole derivatives

Xin Zhang, Minkyung Kang, Hyun A. Choi, Ji Young Jung, K. M.K. Swamy, Soojin Kim, Dabin Kim, Jinheung Kim, Chongmok Lee, Juyoung Yoon

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


As a new approach to detect Cu2+, colorimetric detection of Cu2+ via organo radical formation of thiazolothiazole is reported. Upon the addition of Cu2+, thiazolothiazole derivatives 1 and 2 form relatively stable organo radicals, resulting in a distinct colorimetric change from greenish yellow to blue. Among the various metal ions, only Cu2+ showed a new peak appearance at 610 nm. In addition, a selective fluorescence quenching was also observed with Cu2+. To understand the origin of the Cu2+ selectivity of 1 and 2, series of electrochemical data are reported. Finally, EPR (electron paramagnetic resonance) data clearly support the formation of this unique organic radical formation.

Original languageEnglish
Pages (from-to)691-696
Number of pages6
JournalSensors and Actuators, B: Chemical
StatePublished - 1 Mar 2014

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (CRI No. 2012R1A3A2048814 for J.Y.; NRF-2013-020688 for C.L.). Mass spectral data were obtained from the Korea Basic Science Institute (Daegu) on a Jeol JMS 700 high resolution mass spectrometer.


  • Colorimetric sensor
  • Cu sensor
  • Fluorescent sensor
  • Organic radical
  • Thiazolothiazole


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