Forward Electron Transfer Reactions Research Articles

Spin-labels in biochemistry.

Conference Article| June 01 1985 Spin-labels in biochemistry A. WATTS A. WATTS 1Biochemistry, Department of Oxford University, South Parks Road, Oxford OX1 3QU, U.K. Search for other works by this author on: This Site PubMed Google Scholar Biochem Soc Trans (1985) 13 (3): 588–593. https://doi.org/10.1042/bst0130588 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn MailTo Cite Icon Cite Get Permissions Citation A. WATTS; Spin-labels in biochemistry. Biochem Soc Trans 1 June 1985; 13 (3): 588–593. doi: https://doi.org/10.1042/bst0130588 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll JournalsBiochemical Society Transactions Search Advanced Search Keywords: CPK, Corey-Pauling-Koltan This content is only available as a PDF. © 1985 Biochemical Society1985 Article PDF first page preview Close Modal You do not currently have access to this content.

Benzoquinone quenching of diporphyrin excited states: Kinetic evidence for distinguishing electron transfer photoproducts from (.pi.,.pi.*) states

Previous spectroscopic work on a doubly linked cofacial diporphyrin, Mg-H/sub 2/(5), comprised of magnesium porphyrin and free-base porphyrin subunits provided optical evidence consonant with rapid (> 10/sup 11/ s/sup -1/) light-driven electron transfer (ET) between the subunits in CH/sub 2/Cl/sub 2/ and /sup 1/(..pi..,..pi..*) excited state formation in tetrahydrofuran (THF). Data reported herein for the spectral and kinetic results due to quenching the excited states of Mg-H/sub 2/(5) in these two solvents by the addition of iodobenzene and p-benzoquinone confirm the excited state assignments suggested earlier. A working model of excited state couplings for Mg-H/sub 2/(5) in CH/sub 2/Cl/sub 2/ is reported to account for the rapidity (> 10/sup 11/ s/sup -1/) of the forward ET reaction and the slowness (5 x 10/sup 9/ s/sup -1/) of the reverse one. Finally, the rates and thermodynamic efficiencies of these in vitro ET reactions are shown to compare favorably with those of the primary charge separations found in natural photosystems.