Fluorescence “Turn On-Off” Sensing of Copper (II) Ions Utilizing Coumarin-Based Chemosensor: Experimental Study, Theoretical Calculation, Mineral and Drinking Water Analysis was written by Arslan, Fatma Nur;Geyik, Gonul Akin;Koran, Kenan;Ozen, Furkan;Aydin, Duygu;Elmas, Sukriye Nihan Karuk;Gorgulu, Ahmet Orhan;Yilmaz, Ibrahim. And the article was included in Journal of Fluorescence in 2020.COA of Formula: C5H6ClN This article mentions the following:
Abstract: Herein, we report the preparation of a fluorescent sensor based on coumarin derivative for copper (II) ion sensing in Acetonitrile/HEPES media. 6,7-dihydroxy-3-(4-(trifluoro)methylphenyl)coumarin (HMAC) sensor was fabricated and analyzed by spectroscopic techniques. The sensor demonstrates “turn on-off” fluorescence quenching in the presence of copper (II) ions at 458 nm. A clear complex between the chemosensor HMAC and copper (II) ions was characterized by ESI-MS as well as the Job′s method. Also, the limit of detection (LOD, 3σ/k) value was determined as 24.5 nM in Acetonitrile/HEPES (95/5, volum/volume) buffer media (pH = 7.0). This value is lower than the admissible level of copper (II) ions in drinking water (maximum 31.5 μM) reported by EU Water Framework Directive (WFD) and World Health Organization (WHO) guidelines. The theor. calculations (d. functional theory, DFT) have been performed for the geometric optimized structures. As a final stage, real sample analyses have successfully been performed by using 6,7-dihydroxy-3-(4-(trifluoro)methylphenyl)coumarin, as well as inductively coupled plasma optical emission spectroscopy method. The relative standard deviation for copper (II) in mineral and drinking water samples has been determined to be below 0.15% and recovery values are in the range of 95.48-109.20%. In the experiment, the researchers used many compounds, for example, Pyridinehydrochloride (cas: 628-13-7COA of Formula: C5H6ClN).
Pyridinehydrochloride (cas: 628-13-7) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. One of the examples of pyridines is the well-known alkaloid lithoprimidine, which is an A3 adenosine receptor antagonist and N,N-dimethylaminopyridine (DMAP) analog, commonly used in organic synthesis.COA of Formula: C5H6ClN