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Responses of Metalloporphyrin‐Based Ion‐Selective Electrodes to pH
Author(s) -
Inoue Takuya,
Baba Toshiyuki,
Yuchi Akio
Publication year - 2011
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/elan.201000475
Subject(s) - chemistry , hydrolysis , inorganic chemistry , ion , phase (matter) , base (topology) , organic chemistry , mathematical analysis , mathematics
The ISEs based on [M(tpp)Cl] (M: Al, Ga, In, Mn, Fe; H 2 tpp: tetraphenylporphin) had pH responses across their respective pH ranges, which had some correlation with the pH ranges of the two‐phase hydrolysis. Such pH responses are ascribed to the phase boundary potentials relating to the acid‐base pairs of [M(tpp)(H 2 O)] + and [M(tpp)(OH)] and/or [M 2 (tpp) 2 O]. The potential responses of the In and Fe complexes had the upper limitation to pH of 90 % hydrolysis, whereas those of the Al and Ga complexes had the extension to at least pH 12, indicating stable existence of [M(tpp)(H 2 O)] + even in contact with strongly alkaline solutions.