A5071344086- Photochemistry and Electron Transfer Studies
- Organic Light-Emitting Diodes Research
- Radical Photochemical Reactions
- Luminescence and Fluorescent Materials
- Magnetism in coordination complexes
- Electron Spin Resonance Studies
- Molecular Sensors and Ion Detection
- Porphyrin and Phthalocyanine Chemistry
- Metal complexes synthesis and properties
- Oxidative Organic Chemistry Reactions
- Polyoxometalates: Synthesis and Applications
- Supramolecular Chemistry and Complexes
- Mass Spectrometry Techniques and Applications
- Nanocluster Synthesis and Applications
- Advanced Nanomaterials in Catalysis
- Photochromic and Fluorescence Chemistry
- Electrochemical sensors and biosensors
- Free Radicals and Antioxidants
- Photoreceptor and optogenetics research
National Renewable Energy Laboratory
2021-2022
Metropolitan State University of Denver
2021
Princeton University
2021
University of Colorado System
2021
University of Colorado Boulder
2021
Michigan State University
2021
Colorado State University
2012-2020
North Carolina State University
2014-2015
Google (United States)
2015
A molecular triad assembly consisting of an electron donor, a bis(phenanthroline)copper(I) chromophore, and acceptor has been prepared. Under visible-light excitation, this undergoes efficient (ca. 50%) photoinduced, multistep formation diradical cation charge-separated state that lifetime >100 ns stores >1.0 eV energy. This system constitutes earth-abundant functional analogue related Ru(bpy)(3) systems.
Abstract A series of metal–organic chromophores containing Ru II or Ir III were studied for the luminometric detection nitroaromatic compounds, including trinitrotoluene (TNT). These complexes display long‐lived, intense photoluminescence in visible region and are demonstrated to serve as luminescent sensors nitroaromatics. The solution‐based behavior these photoluminescent molecules has been detail order identify mechanism responsible metal‐to‐ligand charge‐transfer (MLCT) excited state...
The near-visible-to-blue singlet fluorescence of anthracene sensitized by a ruthenium chromophore with long-lived triplet-excited state, [Ru(5-pyrenyl-1,10-phenanthroline)(3)](PF(6))(2), in acetonitrile was investigated. Low intensity non-coherent green light used to selectively excite the sensitizer presence micromolar concentrations generating anti-Stokes, latter, even incident power densities below 500 μW cm(-2). resultant data are consistent photon upconversion proceeding from...
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionCorrection to "Photoinduced Multistep Charge Separation in Heteroleptic Cu(I) Bis(phenanthroline)-Based Donor–Chromophore–Acceptor TriadMegan S. Lazorski, Riley H. Gest, and C. Michael Elliott*Cite this: J. Am. Chem. Soc. 2012, 134, 50, 20566Publication Date (Web):December 5, 2012Publication History Published online5 December 2012Published inissue 19...
One group of ligands used in transition metal complexes is synthesized by derivatizing 1,10‐phenanthroline. These are interest for study the field photovoltaic devices and solar fuels. Previous strategies obtaining 5,6‐diones substituted 1,10‐phenanthrolines do not work 2,9‐diphenyl‐1,10‐phenanthroline due to undesired products resulting from oxidation phenyl substituents. However, 2,9‐diphenyl‐1,10‐phenanthroline‐5,6‐dione can be obtained reasonable yield with BrO 3 − weak aqueous acid. The...
We report evidence of excited-state ion pair reorganisation in a cationic iridium (III) photoredox catalyst 1,4-dioxane. Microwave-frequency dielectric-loss measurements allow us to assign both ground and molecular dipoles polarizability volumes. These show significant changes ground-state dipole moment between [Ir[dF(CF_{3})ppy]_{2}(dtbpy)]PF_{6} (10.74 Debye) [Ir[dF(CF_{3})ppy]_{2}(dtbpy)]BAr^{F}_{4} (4.86 Debye). Photoexcitation each complex results population highly mixed ligand centered...
Two covalently linked donor-acceptor copper phenanthroline complexes (C-A dyads) of interest for solar energy conversion/storage schemes, [Cu(i)(Rphen(OMV)2 4+)2]9+ = RC+A4 8+ with RC+ [Cu(i)Rphen2]+ involving 2,9-methyl (R Me) or 2,9-phenyl Ph)-phenanthroline ligands that are 5,6-disubstituted by 4-(n-butoxy) methylviologen electron acceptor groups (A2+ OMV2+), have been synthesized and investigated via quantum chemical calculations nanosecond laser flash spectroscopy in...
Abstract We report evidence of excited-state ion pair reorganisation in a cationic iridium (III) photoredox catalyst 1,4-dioxane. Microwave-frequency dielectric-loss measurements combined with accurate calculations dipolar relaxation time allow us to assign both ground and molecular dipole moments solution determine the polarizability volume excited-state. These show significant changes ground-state moment between [Ir[dF(CF 3 )ppy] 2 (dtbpy)]PF 6 (10.74 Debye) (dtbpy)]BAr F 4 (4.86 Debye)....
We report evidence of excited-state ion pair reorganisation in a cationic iridium (III) photoredox catalyst 1,4-dioxane. Microwave-frequency dielectric-loss measurements allow us to assign both ground and molecular dipoles polarizability volumes. These show significant changes ground-state dipole moment between [Ir[dF(CF_{3})ppy]_{2}(dtbpy)]PF_{6} (10.74 Debye) [Ir[dF(CF_{3})ppy]_{2}(dtbpy)]BAr^{F}_{4} (4.86 Debye). Photoexcitation each complex results population highly mixed ligand centered...