title: Optical devices for the detection of cyanide in water based on ethyl(hydroxyethyl)cellulose functionalized with perichromic dyes.
abstract: Films of three polymers, based on ethyl(hydroxyethyl)cellulose functionalized with protonated perichromic dyes, were used for anion sensing. The polymer functionalized with protonated Brooker's merocyanine acts as a chromogenic/fluorogenic system for the selective detection of cyanide in water. An increase of >28 times was verified for the fluorescence lifetime of the sensing units in the polymer in comparison with protonated Brooker's merocyanine in water. Moreover, an increase in the pKavalues was verified for the sensing units in the polymers. Data suggest that the hydrocarbonic polymeric chains provide an adequate microenvironment to protect the sensing unit from bulk water. The other polymer, functionalized with an iminophenol, also showed high selectivity for cyanide (detection limit=9.36×10-6molL-1and quantification limit=3.12×10-5molL-1). The polymer functionalized with azophenol units is unable for the detection of cyanide, due to the low pKavalue verified for its chromogenic units.
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil.
authors.forename: Leandro Guarezi
authors.initials: LG
authors.lastname: Nandi
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil.
authors.forename: Celso Rodrigo
authors.initials: CR
authors.lastname: Nicoleti
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil.
authors.forename: Vanderléia Gava
authors.initials: VG
authors.lastname: Marini
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil.
authors.forename: Ismael Casagrande
authors.initials: IC
authors.lastname: Bellettini
authors.affiliation: Departamento de Físico-Química, Instituto de Química de São Carlos, Universidade de São Paulo, USP, CP 780, São Carlos, SP, 13560-970, Brazil.
authors.forename: Silvano Rodrigo
authors.initials: SR
authors.lastname: Valandro
authors.affiliation: Departamento de Físico-Química, Instituto de Química de São Carlos, Universidade de São Paulo, USP, CP 780, São Carlos, SP, 13560-970, Brazil.
authors.forename: Carla Cristina Schmitt
authors.initials: CCS
authors.lastname: Cavalheiro
authors.affiliation: Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CP 476, Florianópolis, SC, 88040-900, Brazil. Electronic address: vanderlei.machado@ufsc.br.
authors.forename: Vanderlei Gageiro
authors.initials: VG
authors.lastname: Machado
keywords: Anion sensing; Chromogenic chemosensors; Cyanide; Ethyl(hydroxyethyl)cellulose; Fluorogenic chemosensors; Naked-eye detection