Highly Efficient Ultrafast Electron Injection from the Singlet MLCT Excited State of Copper(I) Diimine Complexes to TiO2 Nanoparticles

Authors


  • The ultrafast laser and X-ray characterization and analysis are supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Under Contract No. DE-AC02-06CH11357. The synthesis of the complexes is supported as part of the NERC (Non-Equilibrium Research Center), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under the Award Number DE-SC0000989. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06-CH11357. The authors thank Dr. Xiaoyi Zhang, Dr. Kristoffer Haldrup, and Megan Shelby for their assistance in the XTA experiment, and Dr. Xiao-Min Lin for the help in total reflection UV/Vis spectra. O.B. thanks to the Scientific and Technological Research Council of Turkey (TUBITAK) for a fellowship program. MLCT=metal-to-ligand charge transfer.

Abstract

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Cu complexes as photosensitizers: Photoinduced charge-transfer dynamics from a copper(I) diimine complex to TiO2 nanoparticles were investigated by combining multiple time-resolved spectroscopic methods. An efficient and ultrafast electron transfer process from the singlet MLCT state was discovered as a result of structural control owing to the flattening of the tetrahedral geometry in the complex and the bulky groups in the ligands.

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