Effect of Peripheral Substitution on Electron and Energy Transfer in Electrostatically Bound Zinc−Magnesium Porphyrin Dimers

Autor:	Alexander Berg, Haim Levanon, Mazal Rachamim, and Tamar Galili
Rok vydání:	1996
Předmět:	Chemistry Magnesium Dimer General Engineering chemistry.chemical_element Zinc Photochemistry Porphyrin law.invention Electron transfer chemistry.chemical_compound Crystallography law Intramolecular force Singlet state Physical and Theoretical Chemistry Electron paramagnetic resonance
Zdroj:	The Journal of Physical Chemistry. 100:8791-8795
ISSN:	1541-5740 0022-3654
DOI:	10.1021/jp9603290
Popis:	We report on intramolecular electron and/or energy transfer (IET and IEnT), in two photoexcited electrostatically bound dimers: (1) zinc(II) tetrakis(4-sulfonatophenyl)porphyrin and magnesium(II) tetrakis(4-N,N,N-trimethylanilinium)porphyrin, [ZnTSPP−MgTTAP]; and (2) zinc(II) tetrakis(4-N,N,N-trimethylanilinium)porphyrin and magnesium(II) tetrakis(4-sulfonatophenyl)porphyrin, [ZnTTAP−MgTSPP]. The photochemical properties of both dimers, dissolved in dimethylsulfoxide−glycerol (DMSO−Glyc, 140 K), were investigated by continuous wave time-resolved electron paramagnetic resonance (CW-TREPR) spectroscopy. It is demonstrated that by changing the peripheral substitution of the particular metalloporphyrin in the dimer, an IET route, parallel to the singlet IEnT, can be triggered. Thus, singlet IEnT from the Zn to the Mg constituent is the only process in [ZnTSPP−MgTTAP], while IET to produce a charge-separated state, [ZnTTAP•+−MgTSPP•-] accompanies the IEnT in [ZnTTAP−MgTSPP].
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::770dfb4c7aaf2533716536d1b9c2c3b8 https://doi.org/10.1021/jp9603290 Zobrazit plný text záznamu