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The photo-physical study of the interaction of riboflavin with Nicotine in bicontinuous microemulsion

Maurice Ohaekeleihem Iwunze

Abstract


Steady-state fluorescence spectroscopy was used to study the interaction of riboflavin with nicotine in a bicontinuous microemulsion system made up of 42.11:13.70:21.34:22.85 % w/w of water: oil: surfactant: co-surfactant.  The surfactant used is cetyltrimethylammonium bromide (CTAB), the oil is tetradecane and the co-surfactant is 1-pentanol.  It is observed that the interaction of riboflavin and nicotine in the prepared microemulsion lead to the quenching of riboflavin fluorescence.  The bimolecular quenching rate constant, kq, of riboflavin by nicotine was observed as 4.15 x 109 M-1s-1 with an efficiency of 56 %.  The mechanism of the reaction is proposed to be diffusion limited in an activated electron transfer reaction in a solvent separated (outer-sphere) scheme.  The electron transfer rate constant, kET, was calculated as 5.89 x 109 s-1 with an activation rate constant, ka, of 9.52 x 109 s-1. The calculated solvent reorganization energy, λs, of the reaction was 1.09 eV, the free energy of interaction, ΔGo, is -2.9 eV and the free energy of activation, ΔG*, was calculated as 0.75 eV.


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DOI: http://dx.doi.org/10.13171/mjc66/01712301535-iwunze

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