Integrating photoconversion building blocks with catalysts for solar fuels formation

Michael R. Wasielewski, Amanda P.S. Samuel, Dick T. Co, Charlotte L. Stern

Research output: Contribution to journalConference article

Abstract

We will report on electron transfer dynamics in several photodriven charge separation systems covalently-linked at fixed distances to catalysts for solar fuels formation. For example, the synthesis and spectroscopic characterization of a naphthalene-4,5-dicarboximide-1,8-dithiolate diiron complex (NMI-Fe2S2(CO)6, 1) and a covalently-linked, fixed-distance zinc 5,10,15-tri-n-pentyl-20-phenylporphyrin-NMI-Fe2S2(CO)6 donor-acceptor dyad (2) will be discussed. The electron-withdrawing nature of the NMI group makes the diiron complex among the most easily reduced hydrogenase mimics (-0.74 V vs. SCE) reported to date. Selective photoexcitation of the Zn porphyrin in 2 with 553 nm, 110-fs laser pulses yields transient absorption spectra in CH2Cl2 that show a distinct peak at 616 nm, which is assigned to (NMI-Fe2S2(CO)6)-• based on spectroelectrochemical measurements on 1, and is used to monitor the charge separation (CS) and charge recombination (CR) dynamics of 2.

Original languageEnglish
JournalACS National Meeting Book of Abstracts
Publication statusPublished - Dec 1 2010
Event240th ACS National Meeting and Exposition - Boston, MA, United States
Duration: Aug 22 2010Aug 26 2010

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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