Metal Linkage Effects on Ultrafast Energy Transfer. Issue 30 (22nd June 2016)

• Record Type: Journal Article
• Authors: Dekkiche, Hervé; Buisson, Antoine; Langlois, Adam; Karsenti, Paul‐Ludovic; Ruhlmann, Laurent; Ruppert, Romain; Harvey, Pierre
• Is Part Of: Chemistry. Volume 22:Issue 30(2016)
• Page Start: 10484
• Page End: 10493
• Publication Date: 2016-06-22
• Subjects: Förster and Dexter mechanisms -- platinum -- porphyrinoids -- singlet energy transfer; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201601322
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: We report the preparation of several new porphyrin homodimers bridged by a platinum(II) ion in which very intense electronic communication through the coordination link occurs. Moreover, the synthesis of a new porphyrin dyad and its photophysical properties are reported. This dyad exhibits the fastest singlet energy transfer ever reported for synthetic systems between a zinc(II) porphyrin and a porphyrin free base. This extremely fast transfer (∼100 femtoseconds) is in the same range as the fastest one measured in natural systems. This feature is due to the platinum(II) linker, which allows for strong MO couplings between the two porphyrin units as experimentally supported by electrochemistry and corroborated by DFT computations. Abstract : Catching up with nature : The preparation of several new porphyrin homodimers bridged by a platinum(II) ion is reported, in which very intense electronic communication through the coordination link occurs. The platinum(II) bridge promotes ultrafast S1 energy transfer equaling the rate of the very fast transfers observed in the light harvesting complexes found in photosynthetic membranes.