In:
Dalton Transactions, Royal Society of Chemistry (RSC), Vol. 51, No. 40 ( 2022), p. 15393-15402
Abstract:
Phthalocyanine that has four peripheral 2-methoxyphenyl substituents at the α-position and its Zn( ii ) and Cu( ii ) complexes were synthesized. Chemical oxidation by the Cu( ii ) ion and electrochemical oxidation of these metal complexes were investigated spectrophotometrically in acetonitrile. The UV-visible absorption spectra of these metal complexes and their one-electron oxidized π-cation radicals showed no concentration dependence, indicating that these species exist as monomers in solution. Kinetics of the thermal electron transfer reaction from each phthalocyanine complex to Cu 2+ and the photoinduced electron transfer reaction of the Zn( ii ) phthalocyanine complex with V( v ) and V( iv ) Schiff base complexes were studied using conventional spectrophotometric and transient absorption techniques, and the electron transfer rate constants were analysed using the Marcus cross relationship. The obtained rate constants of the electron self-exchange reaction between the parent phthalocyanine complexes and their π-cation radicals were in the order of 10 9 to 10 11 M −1 s −1 at T = 298.2 K. These large electron self-exchange rate constants are consistent with the phthalocyanine-centred redox reactions where small reorganization energies are required with little structural change during the electron transfer process.
Type of Medium:
Online Resource
ISSN:
1477-9226
,
1477-9234
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
1472887-4
