Details

Autor(en) / Beteiligte

• Assadollahnejad, Nazafarin
• Kargar, Maryam
• Darabi, Hossein Reza
• Abouali, Negar
• Jamshidi, Shadi
• Sharifi, Ali
• Aghapoor, Kioumars
• Sayahi, Hani

Titel

A new ratiometric, colorimetric and ''turn-on'' fluorescent chemosensor for the detection of cyanide ions based on a phenol-bisthiazolopyridine hybrid

Ist Teil von

• New journal of chemistry, 2019-08, Vol.43 (33), p.131-139

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A novel C 2 -symmetric ratiometric fluorescence and colorimetric cyanide (CN − ) sensor 1 based on a phenol-bisthiazolopyridine hybrid was synthesized and characterized. Among the various screened anions, this chromogenic receptor 1 showed only a distinct visible color change from colorless to yellow and blue to green fluorescence toward CN − in both pure methanol and aqueous methanol. The ''turn-on'' ratiometric fluorescence (emission shift = 95 nm) and colorimetric (absorbance shift = 45 nm) detection of CN − can be attributed to the deprotonation of the OH groups of 1 , as evidenced by OH − and 1 H NMR experiments. The binding mode of 1 with CN − was determined to be a 1 : 1 stoichiometry through a Job plot. Probe 1 was also highly sensitive (LOD = 75 nM) as measured by ratiometric fluorescence ( I 420 / I 515 nm) methods. Moreover, the reversibility of the deprotonated 1 by HCl in both solution and the solid state (TLC paper test strips) was successful. In general, probe 1 is a promising CN − indicator in terms of its ease-of-use, selectivity, sensitivity, rapid response (<1 s), reversibility and test kit application. This optical probe recognizes CN − over various anions and cations via the deprotonation mechanism as evidenced by 1 H NMR titration.