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A pH responsive electrochemical switch sensor based on Fe(notpH3) [notpH6 = 1,4,7-triazacyclononane-1,4,7-triyl-tris(methylene-phosphonic acid) |
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| Authors: | Chen Yu Su Yan-Hui Zheng Li-Min Xia Xing-Hua |
| Institution: | a State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China b Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China c College of Chemistry and Materials Science, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210046, PR China |
| Abstract: | The electrochemistry of a macrocyclic metal complex Fe(notpH3) notpH6 = 1,4,7-triazacyclononane-1,4,7-triyl-tris(methylene-phosphonic acid)] reveals that the protonation/deprotonation of the non-coordinated P-OH groups in Fe(notpH3) affects its formal potential value (E0′) considerably. Plotting E0′ as function of solution pH gives a straight line with a slope of −585 mV pH−1 in the pH range of 3.4-4.0, which is about ten times larger than the theoretical value of −58 mV pH−1 for a reversible proton-coupled single-electron transfer at 20 °C. A sensitive pH responsive electrochemical switch sensor is thus developed based on Fe(notpH3) which shows an “on/off” switching at pH ∼ 4.0. |
| Keywords: | Iron complex Electrochemistry Switch Sensor 1 4 7-Triazacyclononane-1 4 7-triyl-tris(methylene-phosphonic acid) |
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