|
|
 |
| |
| DAVID A. MODARELLI |
| |
Associate Professor
Associate Director, Center for Laser & Optical Spectroscopy
B.A., 1986, College of Wooster
Ph.D., 1991, University of Massachusetts, Amherst
Postdoctoral fellow, 1991-1993, The Ohio State University
Research Scientist, 1993-1994, R.W. Johnson Pharmaceutical Research Institute
Assistant professor, 1994-1997, Colgate University |
| |
Office: KNCL 214
(330) 972-7366 |
| |
Lab: KNCL 212 & 303
(330)972-8388, (330)972-6611 |
| |
| Email: dmodarelli@uakron.edu |
| |
| Website: http://gozips.uakron.edu/~dam8 |
| |
| Research Interests |
| |
Organic Photovoltaics, Artificial Photosynthesis, Dendrimer synthesis, Electron-Transfer Reactions, Time-Resolved Laser Spectroscopy, Photophysics and Photochemistry.
My group combines synthetic chemistry with ultrafast laser spectroscopy to study the electronic properties of molecules, polymers, and materials. All of our work involves understanding these electronic properties from a physical organic and materials point of view. The properties of both molecules and supramolecular assemblies (i.e., photovoltaic devices) are directly affected by structure.
Synthesis and Ultrafast Time-Resolved Spectroscopy of Organic Photovoltaics
Photovoltaic devices (PDs) are designed to convert solar energy into electricity. Our research on organic PDs is focused on developing new paradigms in PD design by synthesizing cofacial donor/acceptor oligomers. We use ultrafast laser spectroscopy on the femtosecond and picosecond time scales to study energy and electron transfer in these cofacial oligomers. The results from these experiments are translated into preparing new organic PDs.
Monitoring Organic Catalysis: Time-Resolved Fluorescence Anisotropy of Chiral Dendrimers
A second area of research in our group is the study, in real time, of enantioselective reactions catalyzed by chiral dendrimeric catalysts. We use femtosecond pump-probe time-resolved fluorescence anisotropy measurements to examine the time dependent changes in dendrimer structure occurring as catalysis takes place. This research is expected to have far-reaching implications in catalysis as well as biological chemistry.
Electron-Transfer in Photosynthetic Reaction Center Mimics
The photosynthetic reaction center in green plants and purple bacteria utilizes light to initiate a series of electron-transfer steps that transports an electron over extremely long distances. A third area of research in our group involves the synthesis and study of photosynthetic mimics, that is, nanoscale molecules that are designed to replicate the complex and elegant process of electron-transfer in biological systems. The photosynthetic mimics synthesized and studied in our research group are based upon dendrimers that contain porphyrins or porphyrin analogs at the core of the dendrimer and electron acceptor groups as end-groups.
Photophysical Properties of Unusual Porphyrins and Porphyrinoids
Within our group we also study the optical properties (steady state and ultrafast time-resolved) of unusual porphyrins and porphyrinoids. We have recently studied the photophysical properties of N-confused porphyrins, corroles and octaphyrins using these techniques. |
| |
| Selected Publications |
| |
Adsorption of 7-Ethynyl-2,4,9-trithia-tricyclo[3.3.1.13,7]decane on ultra-thin CdS films, Ivan Dolog, Robert R. Mallik, Anthony Mozynski, Jun Hu, Surface Science, 600, 2972-2979 2006.
Shaw, J.L.; Wolff, S.A.; Aleman, E.A.; Ziegler, C.J.; Modarelli, D.A. "Synthesis and Spectroscopy of a Series of Substituted N-Confused Tetraphenylporphyrins" J. Org. Chem. 2004, 69, 7423-7427.
Wolff, S.A.; Alemán, E.A.; Banerjee, D.; Rinaldi, P.L.; Modarelli, D.A. "One-Step Synthesis and Characterization of Difunctionalized N-Confused Tetraphenylporphyrins" J. Org. Chem. 2004, 69, 4571-4576.
Belair,J.P.; Ziegler, C.J.; Rajesh, C.S.; Modarelli, D.A. "Photophysical Characterization of Free-Base N-Confused Tetraphenylporphyrins" J. Phys. Chem. A 2002, 106, 6445-6451.
Rajesh, C.S.; Capitosti, G.J.; Cramer, S.C.; Modarelli, D.A. "Photoinduced Through-Space Electron-Transfer within a Series of Free-Base and Zinc Porphyrin- Containing Poly(Amide) Dendrimers" J. Phys. Chem. B 2001, 105, 10175-10188.
"Intramolecular Photoinduced Electron-Transfer Within Porphyrin-Containing Polyamide Dendrimers" Capitosti, G.J.; Cramer, S.J.; Rajesh, C.S.; Modarelli, D.A. Org. Lett. 2001, 3, 1645-1648. |
| |
|
|
