The reaction of electrochemically generated o-benzoquinones from oxidation of quercetin and catechin as Michael acceptors with cyanide ion as nucleophile has been studied using cyclic voltammetry. The reaction mechanism is believed to be EC; including oxidation of catechol moiety of these antioxidants followed by Michael addition of cyanide ion. The observed homogeneous rate constants (k obs ) for reactions were estimated by comparing the experimental voltammetric responses with the digitally simulated results based on the proposed mechanism. The effects of pH and nucleophile concentration on voltammetric behavior and the rate constants of chemical reactions were also described.
Abstract-Reduction of fuel consumption, especially hydrocarbons which are the main sources of energy, is one of the most serious concerns of scientific and also industrial societies. Magnetic field is found to be a potential candidate to enhance the combustion behavior of hydrocarbons. The current study is an effort to investigate the effects of magnetic field on n-hexane and benzine in molecular and electronical scales using UV-Visible and also FT-IR techniques. It is observed that molecules of hydrocarbons modifies by activating new vibrational modes in exposure to strong enough magnetic fields, leading to increase in average kinetic energy and then free energy of fuel. In other words, applying strong enough magnetic field could increase the combustion enthalpy and the reduction the rate of combustion.
e reaction of electrochemically generated o-quinones from oxidation of esculetin as Michael acceptor with nitrite ion as nucleophile has been studied using cyclic voltammetry. e reaction mechanism is believed to be EC, including oxidation of catechol moiety of esculetin followed by Michael addition of nitrite ion. e observed homogeneous rate constants (obs) for reactions were estimated by comparing the experimental voltammetric responses with the digitally simulated results based on the proposed mechanism. Also the effects of pH and nucleophile concentration on voltammetric behavior and the rate constants of chemical reactions were described.
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