Department of Chemistry, Capital Normal University , Beijing 100048, China.
J Phys Chem A. 2012 Jul 19;116(28):7462-6. doi: 10.1021/jp3024364. Epub 2012 Jul 9.
A novel mechanism of amplifying pH oscillations by pH-dependent EDTA-metal ion complexation is proposed. If there is a metal ion involved in the H(+) consuming reactions in the pH oscillator and the metal's complex formation constant is big enough, the nonlinear coupling of the original oscillator with the complexation induced metal ion oscillation can finally amplify the pH oscillation. This effect is demonstrated in H(2)O(2)-S(2)O(3)(2-)-Cu(2+) system and further discussed in three other systems. Since pH oscillation is widely used in many areas as a spontaneous periodical driving force at the molecular level, this work may help to broaden the driving range of pH oscillators.
提出了一种通过 pH 依赖的 EDTA-金属离子络合来放大 pH 振荡的新机制。如果 pH 振荡器中存在参与 H(+)消耗反应的金属离子，并且金属的络合形成常数足够大，那么原始振荡器与络合诱导的金属离子振荡的非线性耦合最终可以放大 pH 振荡。该效应在 H(2)O(2)-S(2)O(3)(2-)-Cu(2+)体系中得到了验证，并在另外三个体系中进行了进一步讨论。由于 pH 振荡作为分子水平上的自发周期性驱动力在许多领域得到广泛应用，因此这项工作可能有助于拓宽 pH 振荡器的驱动范围。
