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Ultrafast Two-Electron Transfer in a CdS Quantum Dot–Extended-Viologen Cyclophane Complex

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5b13386· OSTI ID:1387722
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [1];  [1];  [1]
  1. Northwestern Univ., Evanston, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)
  2. Northwestern Univ., Evanston, IL (United States)

Time-resolved optical spectroscopies revealmulti-electron transfer from the biexcitonic state of a CdS quantum dot toan adsorbed tetracationic compoundcyclobis(4,4'-(1,4-phenylene)bipyridin-1-ium-1,4-phenylene-bis(methylene))(ExBox4+)to formboth the ExBox3+∙and the doubly reduced ExBox2(+∙)statesfrom a single laser pulse. Electron transfer in the single-exciton regime occurs in 1 ps.At higher excitation powers the second electron transfertakes~5ps, which leadsto a mixture of redox states of the acceptor ligand.The doubly reducedExBox2(+∙)state has a lifetime of ~10 ns, while CdS+∙:ExBox3+∙recombines with multiple time constants, the longest of which is ~300 μs. The long-lived charge separation and ability to accumulate multiple charges on ExBox4+ demonstrate the potential of the CdS:ExBox4+complex to serve as a platform for two-electron photocataly-sis.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Camille and Henry Dreyfus Postdoctoral Program in Environmental Chemistry; National Science Foundation (NSF); Ryan Fellowship; International Institute for Nanotechnology (IIN)
Grant/Contract Number:
SC0001059
OSTI ID:
1387722
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 19 Vol. 138; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (39)

Electron Transfer and Multi-Electron Accumulation in ExBox 4+ journal May 2014
Photoinduced Electron Transfer within a Zinc Porphyrin-Cyclobis(paraquat- p -phenylene) Donor-Acceptor Dyad journal September 2014
Ultrafast Electron Transfer from Photoexcited CdSe Quantum Dots to Methylviologen journal July 2011
Quantum dot sensitized solar cell based on poly (3-hexyl thiophene)/CdSe nanocomposites journal October 2015
Supramolecular Ex plorations: Ex hibiting the Ex tent of Ex tended Cationic Cyclophanes journal January 2016
Multiexciton Annihilation and Dissociation in Quantum Confined Semiconductor Nanocrystals journal November 2012
Generating Free Charges by Carrier Multiplication in Quantum Dots for Highly Efficient Photovoltaics journal January 2015
Experimental Determination of the Extinction Coefficient of CdTe, CdSe, and CdS Nanocrystals journal July 2003
Light-induced electron transfer in colloidal semiconductor dispersions: single vs. dielectronic reduction of acceptors by conduction-band electrons journal October 1983
Ultrafast Charge Separation at CdS Quantum Dot/Rhodamine B Molecule Interface journal December 2007
Multiple Exciton Dissociation in CdSe Quantum Dots by Ultrafast Electron Transfer to Adsorbed Methylene Blue journal April 2010
Simultaneous Determination of the Adsorption Constant and the Photoinduced Electron Transfer Rate for a Cds Quantum Dot–Viologen Complex journal July 2011
Wave Function Engineering for Efficient Extraction of up to Nineteen Electrons from One CdSe/CdS Quasi-Type II Quantum Dot journal February 2012
Dual-Time Scale Photoinduced Electron Transfer from PbS Quantum Dots to a Molecular Acceptor journal July 2012
ExBox: A Polycyclic Aromatic Hydrocarbon Scavenger journal October 2012
Ultrafast Charge Separation in Multiexcited CdSe Quantum Dots Mediated by Adsorbed Electron Acceptors journal February 2009
Solvents Effects on Charge Transfer from Quantum Dots journal March 2015
Energy and Electron Transfer Dynamics within a Series of Perylene Diimide/Cyclophane Systems journal November 2015
Photocatalytic Conversion of Nitrobenzene to Aniline through Sequential Proton-Coupled One-Electron Transfers from a Cadmium Sulfide Quantum Dot journal January 2016
Isolation and oxidation-reduction of methylviologen cation radicals. Novel disproportionation in charge-transfer salts by x-ray crystallography journal June 1990
Synthesis of Ex n Box Cyclophanes journal November 2013
Charge Carrier Resolved Relaxation of the First Excitonic State in CdSe Quantum Dots Probed with Near-Infrared Transient Absorption Spectroscopy journal November 2010
Ultrafast Conformational Dynamics of Electron Transfer in ExBox 4+ ⊂Perylene journal November 2013
Exciton Dissociation in CdSe Quantum Dots by Hole Transfer to Phenothiazine journal November 2008
Evidence for a Through-Space Pathway for Electron Transfer from Quantum Dots to Carboxylate-Functionalized Viologens journal September 2012
Polarization-Driven Stark Shifts in Quantum Dot Luminescence from Single CdSe/oligo-PPV Nanoparticles journal April 2010
Multiple Exciton Generation and Dissociation in PbS Quantum Dot-Electron Acceptor Complexes journal July 2012
Mechanisms for Adsorption of Methyl Viologen on CdS Quantum Dots journal February 2014
Auger Recombination of Biexcitons and Negative and Positive Trions in Individual Quantum Dots journal June 2014
Electron Densities in Semiquinones by Paramagnetic Resonance journal March 1956
Indirect Hyperfine Interactions in the Paramagnetic Resonance Spectra of Aromatic Free Radicals journal April 1956
Intraband relaxation in CdSe nanocrystals and the strong influence of the surface ligands journal August 2005
Multielectron storage and hydrogen generation with colloidal semiconductors journal May 1983
Intraband relaxation in CdSe quantum dots journal July 1999
Mechanisms for intraband energy relaxation in semiconductor quantum dots: The role of electron-hole interactions journal May 2000
Size- and temperature-dependence of exciton lifetimes in CdSe quantum dots journal August 2006
Scaling of multiexciton lifetimes in semiconductor nanocrystals journal May 2008
Multicarrier Interactions in Semiconductor Nanocrystals in Relation to the Phenomena of Auger Recombination and Carrier Multiplication journal March 2014
Spectral and Dynamical Properties of Multiexcitons in Semiconductor Nanocrystals journal May 2007

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Figures / Tables (7)