On photokinetics under monochromatic light

Date

2023-09-14

Advisors

Journal Title

Journal ISSN

ISSN

Volume Title

Publisher

Frontiers

Type

Article

Peer reviewed

Yes

Abstract

The properties of photokinetics under monochromatic light have not yet been fully described in the literature. In addition, for the last 120 years or so, explicit, handy model equations that can map out the kinetic behaviour of photoreactions have been lacking. These gaps in the knowledge are addressed in the present paper. Several general features of such photokinetics were investigated, including the effects of initial reactant concentration, the presence of spectator molecules, and radiation intensity. A unique equation, standing for a pseudo-integrated rate law, capable of outlining the kinetic behaviour of any photoreaction is proposed. In addition, a method that solves for quantum yields and absorption coefficients of all species of a given photoreaction is detailed. A metric (the initial velocity) has been adopted, and its reliability for the quantification of several effects was proven by theoretical derivation, Runge–Kutta numerical integration calculations and through the model equation proposed. Overall, this study shows that, under monochromatic light, photoreaction kinetics is well described by Φ-order kinetics, which is embodied by a unifying model equation. This paper is aimed at contributing to rationalising photokinetics via reliable, easy-to-use mathematical tools.

Description

open access article

Keywords

photokinetics, Φ-order kinetics, quantum yield, actinometry, solving kinetics, monochromatic light

Citation

Maafi, M. (2023) On photokinetics under monochromatic light. Frontiers in Chemistry, 11, 1233151

Rights

Attribution 2.0 UK: England & Wales
http://creativecommons.org/licenses/by/2.0/uk/

Research Institute

Leicester Institute for Pharmaceutical Innovation - From Molecules to Practice (LIPI)