The novel sensitive and selective chemosensors for determination of multiple analytes

• Published in: Dyes and pigments 2020-12, Vol.183, p.108701, Article 108701
• Main Authors: Çakmaz, Deniz, Özarslan, Arda, Aydıner, Burcu, Eroğlu, Ahmet Burak, Seferoğlu, Nurgül, Şenöz, Hülya, Seferoğlu, Zeynel
• Format: Article
• Language: English
• Subjects: Anions; Azo dyes; Colorimetric chemosensors; DFT; Organic bases; pH sensors
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2020.108701

Novel chemosensors that are azo dyes bearing coumarin with indole and thiophene recognition moieties were synthesized. Sensor properties of the dyes were investigated within multiple basic environments that include various pH ranges, anions, and organic amines. Recognition of the basic media by the chemosensors that have acidic NH and NH2 groups, occurs via the deprotonation process which was supported with reversibility study and 1H NMR experiments. The Density Functional Theory calculations have employed to support the experimental results. Chemosensors 6a and 6b showed remarkable detection ability in a pH range of 7–11 and they have been also successfully utilized in the determination of CN− in semi-aqueous media. [Display omitted] •Two novel colorimetric chemosensors based coumarin-indole that conjugated by the azo and dimethine bridge were synthesized.•The reaction between the dyes and cyanide caused an apparent color change and can be seen with the naked eye.•The dyes can be used as a chemosensor for selective cyanide detection in partial aqueous media.•The dyes are affected by the change in pH of media and can detect that colorimetrically.