title: A novel cyanide-selective colorimetric and fluorescent chemosensor: first molecular security keypad lock based on phosphotungstic acid and CN- inputs.
abstract: Rhodamine B (RhB) an available dye has been developed as novel and efficient colorimetric and fluorometric chemosensor for cyanide ions in an absolutely aqueous media. The UV-vis absorption and fluorescent emission titrations experiments have been employed to study the sensing process. RhB could act as an efficient "ON-OFF" fluorescent response for phosphotungstic acid (H3PW12O40 or PTA) based on an ion associate process. Also (RhB(+))3 · PTA(3-) could operate as an "OFF-ON" fluorescent sensor for cyanide anions based on a ligand substitution process. It has been identified as highly sensitive probe for CN(-) which responds at 0.3 and 0.04 μmol L(-1) concentration levels by absorption and fluorescent method respectively. Depending upon the sequence of addition of PTA and CN(-) ions into the solution, RhB could be as a molecular security keypad lock with PTA and CN(-) inputs. The ionic inputs to new fluorophore have been mimicked as a superimposed electronic molecular keypad lock. The results were compared successfully (>96%) with the data of a spectrophotometry approved method (EPA 9014-1) for cyanide ions.
authors.affiliation: Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Islamic Republic of Iran. Electronic address: Tavallali@pnu.ac.ir.
authors.forename: Hossein
authors.initials: H
authors.lastname: Tavallali
authors.affiliation: Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Islamic Republic of Iran.
authors.forename: Gohar
authors.initials: G
authors.lastname: Deilamy-Rad
authors.affiliation: Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Islamic Republic of Iran.
authors.forename: Abolfath
authors.initials: A
authors.lastname: Parhami
authors.affiliation: Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Islamic Republic of Iran.
authors.forename: Nahid
authors.initials: N
authors.lastname: Hasanli
mesh_terms: D003124:Colorimetry; D003486:Cyanides / Q000032:analysis* / Q000097:blood / Q000737:chemistry; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D006801:Humans; D010772:Phosphotungstic Acid / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry*; D062065:Wastewater / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D003486:Cyanides; D005456:Fluorescent Dyes; D010772:Phosphotungstic Acid; D012235:Rhodamines; D062065:Wastewater; D014874:Water Pollutants, Chemical; C029773:rhodamine B
keywords: Anion sensing; Cyanide ions; Fluorescent chemosensor; Molecular keypad lock; Phosphotungstic acid; Rhodamine B