An unusual emissive and colorimetric copper (II) detection by a selective probe based on a pseudo-crown cysteine dye: Solution and gas phase studies |
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| Affiliation: | 1. Bioscope Group, UCIBIO-REQUIMTE, Chemistry Department, Faculty of Sciences and Technology, University Nova of Lisbon, 2829-516 Caparica, Portugal;2. Proteomass Scientific Society, Rua dos Inventores, Madan Park, 2829-516 Caparica, Portugal;1. College of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu Province 212013, China;2. College of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu Province 212013, China;3. School of Computer and Communications Engineering, Jiangsu University, Zhenjiang, Jiangsu Province 212013, China |
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| Abstract: | 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 +. |
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