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Studies of the Interaction Between Metalloporphyrin Films and Phenols in a Preconcentration Type Sensor
Author(s) -
Dall'Orto Viviana Campo,
Danilowicz Claudia,
Hurst Jorge,
Balbo Alfredo Lo,
Rezzano Irene
Publication year - 1998
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199802)10:2<127::aid-elan127>3.0.co;2-3
Subject(s) - phenols , type (biology) , chemistry , organic chemistry , geology , paleontology
Metalloporphyrins have been used as sensors to detect phenols. We describe several experiments that indicate that the increment of current response is due to a preconcentration effect of the phenolic analyte in the modifying layer. The aromatic structure seems to be crucial to achieve this goal, indicating π–π interaction. The electrical response to phenols of a variety of poly[M‐(PPIX)] films, M = Ni II , Co II and Cu II was measured suggesting an axial ligand‐metalloporphyrin interaction. The IR spectras of p ‐nitrophenol with and without porphyrins were obtained showing a gradual decrease of the signal at 1205.6 cm −1 , corresponding to C–O stretching and the presence of two new peaks (1236.7, 1167.4 cm −1 ). Further the signal at 1345 cm −1 corresponding to symmetric (ArNO 2 ) N–O stretching, remains unchanged. Therefore, these results indicate that the –C–OH group is involved in the binding.