title: Highly selective colorimetric detection of cyanide anions in aqueous media by triphenylamine and phenanthro(9,10-d)imidazole based probes.
abstract: Two novel fluorescent probes based on triphenylamine (TPC) and phenanthro(9,10-d-imidazole) (PITP) have been synthesized and studied as cyanide selective indicators in aqueous media. Complete colour bleaching was observed due to the nucleophilic addition of cyanide to the 2-vinylmalononitrile of TPC, which results in the disruption of the extended conjugation and turns off the intramolecular charge transfer (ICT) process. Furthermore, a visible color change was observed with a large Stokes shift (108 nm) upon the addition of cyanide anions to PITP, due to the formation of hydrogen bonding between the CN-anion and -NH of PITP, which increased the electron density on the donor moiety and induced strong ICT.
authors.affiliation: School of Chemistry, Madurai Kamaraj University, Madurai-21, Tamilnadu, India. drasiva@gmail.com ptcsiva@yahoo.co.in.
authors.forename: Arockiam Jesin
authors.initials: AJ
authors.lastname: Beneto
authors.affiliation: School of Chemistry, Madurai Kamaraj University, Madurai-21, Tamilnadu, India. drasiva@gmail.com ptcsiva@yahoo.co.in.
authors.forename: Ayyanar
authors.identifier: 0000-0003-3930-9403
authors.initials: A
authors.lastname: Siva
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D000838:Anions / Q000737:chemistry; D003124:Colorimetry; D003486:Cyanides / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry; D006860:Hydrogen Bonding; D007093:Imidazoles / Q000737:chemistry; D008027:Light; D009682:Magnetic Resonance Spectroscopy; D010616:Phenanthrenes / Q000737:chemistry*; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry
chemical_list: D000814:Aniline Compounds; D000838:Anions; D003486:Cyanides; D005456:Fluorescent Dyes; D007093:Imidazoles; D010616:Phenanthrenes; D014867:Water