Spin catalysis of the radical recombination reaction

Paramagnetic spin catalysis of a radical recombination reaction

“…In spite of the oversimplified character of the model, the calculations predict qualitatively an appreciable enhancement of the radical recombination rate constant for the geminate RP and for statistical (spin-noncorrelated) radical pairs from the bulk. The results are in qualitative agreement with spin catalysis observations in radical recombination reactions catalysed by paramagnetic substances [6,34,43].…”

“…Quite recently Buchachenko et al [6,43] have found one more example of paramagnetic spin catalysis of RRR in zero magnetic field. Nitroxide radicals [43] and biradicals [6] were shown to be able to increase the RRR rate constant by 50-300% in homogeneous, nonviscous solutions.…”

“…Nitroxide radicals [43] and biradicals [6] were shown to be able to increase the RRR rate constant by 50-300% in homogeneous, nonviscous solutions. In the case of the nitroxide biradicals the RRR of alkyl radical with one of the N* termini is catalysed by the presence of the second spin-carring N-0 terminus.…”

A Model of spin catalysis in bacterial photosynthetic reaction centres

“…One of the interesting examples of spin effects in chemical reactions is a phenomenon of spin catalysis in radical recombination (see, for example, [2,3]). Physical mechanism of the phenomenon is based on singlet-triplet (ST) transitions in radical pair (RP) caused by exchange interactions with a third paramagnetic particle.…”

“…Physical mechanism of the phenomenon is based on singlet-triplet (ST) transitions in radical pair (RP) caused by exchange interactions with a third paramagnetic particle. ST-conversion of RP removes spin forbiddance for triplet recombination and results in an alteration of reaction kinetics and product yield [2][3][4][5].…”