An unusual emissive and colorimetric copper (II) detection by a selective probe based on a pseudo-crown cysteine dye

Solution and gas phase studies

Nuno A. Morais, Luz Fernandes, Jessica Ariana-Machado, José Luis Capelo, Carlos Lodeiro, Elisabete Oliveira

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1 Citation (Scopus)


An off-on-off emissive and colorimetric probe L, based on a Pseudo-Crown cysteine dye was designed for Copper (II). Compound L was studied in solution and in gas-phase (MALDI-MS) over alkaline, alkaline, earth-alkaline and transition metal ions (Li+, Na+, K+, Ca2 +, Mg2 +, Zn2 +, Cu2 +, Co2 +, Ni2 +, Pb2 +, and Hg2 +) in organic media. The recognition of Cu2 + by L lead to red/dark red colored complexes, one emissive L2Cu and another LCu, less emissive. In regards to fluorescent quantum yield in both cases an increase respective to L was visualized (2 fold for LCu and 7 fold for L2Cu). The paramagnetic nature of both complexes was proved by the synthesis of both complex species, as well as, through 1H NMR and FTIR. Compound L demonstrate to be able to detect and quantify the minimal amounts of 1.3 μM/3.3 μM of Cu2 +.

Original languageEnglish
Pages (from-to)299-303
Number of pages5
JournalInorganic Chemistry Communications
Publication statusPublished - 1 Dec 2017



  • Colorimetric
  • Copper (II)
  • Cysteine
  • Fluorescence

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