Chellappan, Retna Raj ; Okajima, Takeyo ; Ohsaka, Takeo (2002) Voltammetric measurement of pH using a mixed self-assembly of macrocyclic nickel(II) complex and diimine on gold electrode Electrochemistry Communications, 4 (4). pp. 330-335. ISSN 1388-2481
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Official URL: https://doi.org/10.1016/S1388-2481(02)00303-X
Related URL: http://dx.doi.org/10.1016/S1388-2481(02)00303-X
Abstract
Redox active mixed self-assembled monolayers (SAMs) of a macrocyclic nickel complex, dinickel (II)(2,2′-bis(1,3,5,8,12-pentaazacyclotetradec-3-yl)-diethyl disulfide (MNC) and a electrochemically derived diimine, 4′-mercapto-N-phenylquinone diimine (NPQD) on gold electrode is used for the voltammetric measurement of solution pH (pH 6–9.4). The formal potential of MNC is insensitive to the solution pH and it serves as a reference molecule, whereas the redox reaction of NPQD is pH dependent and it serves as an indicator molecule. The formal potential of NPQD shifts −56 mV while changing the solution pH by one unit. The formal potential of the bifunctional self-assembly is insensitive to oxygen in solution and the dissolved oxygen does not interfere with the voltammetric measurement.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 139996 |
| Deposited On: | 03 Sep 2025 06:43 |
| Last Modified: | 03 Sep 2025 06:43 |
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