1567 Irving Hill Rd
Lawrence, KS 66045
The primary focus of our work is to better understand the reaction dynamics of molecules in solution. We use ultrafast spectroscopy to monitor chemical reactions on the time scale of atomic motion and look for new ways to probe the dynamics in order to learn more about the fundamental physical processes that govern chemistry.
For example, we are interested in the excited state dynamics of "molecular photoswitches" that will be used in the next generation of data storage. Reversible opening and closing of a 6-member ring at the heart of these photochromic (color-changing) molecules enables them to store information based on the different absorption and refraction properties of each state. From a fundamental standpoint, these color changing reactions are fascinating because they involve dynamics on several different potential energy surfaces. Non-adiabatic transitions, vibrational relaxation, and solvent-solute interactions all play a role as the system moves along the reaction coordinate. We examine each of these, and try to exploit what we learn to control the outcome of the reaction.
- Condensed-phase chemical reaction dynamics
- Excited-state dynamics of photochromic molecular switches
- And photoactive materials
- Nanoplasmon-mediated photochemistry
- Ultrafast laser spectroscopy
Selected Publications —
Srivastava, P., Stierwalt, D.A., and Elles, C.G. Broadband Two-Photon Absorption Spectroscopy with Stimulated Raman Scattering as an Internal Standard. Anal. Chem. 2023, 95, 35, 13227-13234. DOI: 10.1021/acs.analchem.3c02298
Chen, R., Qiu, K., Leong, D.C.Y., Kundu, B.K., Zyhang, C., Srivastava, P., White, K.E., Li, G., Han, G., Guo, Z., Elles, C.G., Diao, J., and Sun, Y. A General Design of Pyridinium-Based Fluorescent Probes for Enhancing Two-Photon Microscopy. Biosensors and Bioelectronics 239 (2023) 115604. https://doi.org/10.1016/j.bios.2023.115604
Kundu, B.K., Han, C., Srivastava, P., Nagar, S., White, K.E., Krause, J.A., Elles, C.G., and Sun, Y. Trifluoromethylative Bifunctionalization of Alkenes via a Bibenzothiazole-Derived Photocatalyst under Both Visible- and Near-Infrared-Light Irradiation. ACS Catal. 2023, 13, 8119-8127. DOI: 10.1021/acscatal.3c01812
Singh, M., Dhote, P., Johnson, D.R., Figueroa-Lazu, S., Elles, C.G., Boskovic, Z. Photochemical Decarbonylation of Oxetanone and Azetidinone: Spectroscopy, Computational Models, and Synthetic Applications. Angew. Chem. Int. Ed. 2023, 62, e202215856. https://doi.org/10.1002/anie.202215856
Burns, K.H., Quincy, T.J., Elles, C.G. Excited-state resonance Raman spectroscopy probes the sequential two-photon excitation mechanism of a photochromic molecular switch. J. Chem. Phys. 157, 234302 (2022). https://doi.org/10.1063/5.0126974
Burns, K. H., Elles, C.G., Ultrafast Dynamics of a Molecular Switch from Resonance Raman Spectroscopy The Journal of Physical Chemistry A 2022 126 (35), 5932-5939 DOI: 10.1021/acs.jpca.2c05435
Ramamurthy, V., Sen, P., and Elles, C.G., Ultrafast Excited State Dynamics of Spatially Confined Organic Molecules, 2022. DOI: 10.1021/acs.jpca.2c03276
Singh, M., Gaskins, B., Johnson, D.R., Elles, C.G., and Boskovic, Z., Synthesis of Cycloheptatriene-Containing Azetidine Lactones. Journal of Organic Chemistry, 2022. DOI: 10.1021/acs.joc.2c00367
Otolski, C.J., et al., Spatial confinement alters the ultrafast photoisomerization dynamics of azobenzenes. Chemical Science, 2020. 11(35): p. 9513-9523.
Henke, W.C., et al., Ultrafast Spectroscopy of Mn(CO)(3) Complexes: Tuning the Kinetics of Light-Driven CO Release and Solvent Binding. Inorganic Chemistry, 2020. 59(4): p. 2178-2187.
Burns, K.H., P. Srivastava, and C.G. Elles, Absolute Cross Sections of Liquids from Broadband Stimulated Raman Scattering with Femtosecond and Picosecond Pulses. Analytical Chemistry, 2020. 92(15): p. 10686-10692.
Barclay, M.S., C.G. Elles, and M. Caricato, Benchmark Study of Ground-State Raman Spectra in Conjugated Molecules. Journal of Chemical Theory and Computation, 2020. 16(1): p. 612-620.
Barclay, M.S., C.G. Elles, and M. Caricato, On the Discrepancy between Experimental and Calculated Raman Intensities for Conjugated Phenyl and Thiophene Derivatives. Journal of Physical Chemistry A, 2020. 124(23): p. 4678-4689.
Otolski, C.J., et al., Ultrafast trans -> cis Photoisomerization Dynamics of Alkyl-Substituted Stilbenes in a Supramolecular Capsule. Journal of Physical Chemistry A, 2019. 123(24): p. 5061-5071.
Otolski, C.J., et al., Ultrafast Dynamics of Encapsulated Molecules Reveals New Insight on the Photoisomerization Mechanism for Azobenzenes. Journal of Physical Chemistry Letters, 2019. 10(1): p. 121-127.
Bhattacharyya, D., et al., Electronic Structure of Liquid Methanol and Ethanol from Polarization-Dependent Two-Photon Absorption Spectroscopy. Journal of Physical Chemistry A, 2019. 123(27): p. 5789-5804.
Barclay, M.S., M. Caricato, and C.G. Elles, Femtosecond Stimulated Raman Scattering from Triplet Electronic States: Experimental and Theoretical Study of Resonance Enhancements. Journal of Physical Chemistry A, 2019. 123(36): p. 7720-7732.
Quincy, T.J., et al., Probing Dynamics in Higher-Lying Electronic States with Resonance-Enhanced Femtosecond Stimulated Raman Spectroscopy. Journal of Physical Chemistry A, 2018. 122(42): p. 8308-8319.
Awards & Honors —
NSF CAREER Award
2012 - 2017
Finalist, Honor for an Outstanding Progressive Educator (H.O.P.E.) Award, University of Kansas
J. Michael Young Academic Advisor Award, KU College of Liberal Arts and Sciences
Kansas NSF EPSCoR First Award
2011 - 2012
Visiting Professorship, University of Rome "La Sapienza"