Effect of a Weak Magnetic Field on the Reaction between Neutral Free Radicals in Isotropic Solution

Abstract

Radical recombination following the photodissociation of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone in isotropic solution was monitored using time-resolved infrared spectroscopy. The rate of radical recombination was determined to decrease in the presence of a magnetic field of greater than 5 mT and to increase in the presence of a magnetic field smaller than 5 mT.

Photoreceptor-based magnetoreception: optimal design of receptor molecules, cells, and neuronal processing

“…In the decade following, a significant body of work, both experimental and theoretical (Stass et al 2000;Weaver et al 2000;Timmel et al 2001;Woodward et al 2001;Weaver 2002;Cintolesi et al 2003;Henbest et al 2004;Ritz et al 2004Ritz et al , 2009Vink & Woodward 2004;O'Dea et al 2005;Rodgers et al 2005Rodgers et al , 2007Thalau et al 2005;Vaughan & Weaver 2005;Shakirov et al 2006;Solov'yov et al 2007;Woodward & Vink 2007;Efimova & Hore 2008;Maeda et al 2008;Miura & Murai 2008;Solov'yov & Schulten 2009;Hill & Ritz 2010;Lau et al 2010), has advanced our information and understanding of how a putative radical-pair magnetoreceptor should be designed so as to be well suited to detect the geomagnetic field. Behavioural studies have provided more information about the functional properties of magnetic compasses in a variety of animals (Rappl et al 2000;Wiltschko et al 2000aWiltschko et al ,b, 2001Wiltschko et al , 2002bWiltschko et al , 2003aWiltschko et al , 2004aWiltschko et al ,b, 2005Wiltschko et al , 2006Wiltschko et al , 2007aÅ kesson et al 2001;Phillips et al 2001Phillips et al , 2002Muheim et al 2002Muheim et al , 2006Irwin & Loh...…”

Magnetic Field Effects on Radical Pairs in Homogeneous Solution

“…51 However, distinct LFEs have now been observed for a range of benzoyl radical containing neutral RPs in homogeneous solutions of moderately high viscosity. 52,53 The observed MARY dependence in these systems has been well reproduced using Monte Carlo simulations. By varying the RP partners, the size of the LFE can be substantially modified (and even removed) (see Fig.…”

Laser Flash Photolysis of Photoinitiators: ESR, Optical, and IR Spectroscopy Detection of Transients

“…This is the result of the action of the LFE, which enhances S-T mixing in the RP through removal of HF spin-state degeneracies. 20,21 At higher magnetic flux densities (B > 10 mT), a well-studied HFC mechanism 19 leads to an increase in the radical escape from a triplet RP ( Fig. 12.1).…”

“…13,[19][20][21] Application of a moderate MF accelerates photopolymerization initiated by PI leading to triplet RPs. 14 The main effect is an increase in f and an increase in the rate of initiation.…”

“…Effect of an external magnetic field (B) on the yield of free radicals obtained under photodissociation of IRG2959 (Scheme 12.1) in cyclohexanol 20. …”