Publications

Journals

* – corresponding author; † – equal contributions

14. Ravi Kumar Venkatraman,^† Amal Hassan Tolba,^† Theis I. Sølling, Radek Cibulka, and Ahmed M. El-Zohry*, “Ultrafast Events of Photoexcited Iron(III) Chloride for Activation of Benzylic C–H Bonds”, J. Phys. Chem. Lett., 15, 6202-6208, 2024. Impact Factor: 5.7 (DOI: 10.1021/acs.jpclett.4c01116)

13. SS Nazeer*, Ravi Kumar Venkatraman, RS Jayasree, and J Bayry, “Infrared Spectroscopy for Rapid Triage of Cancer Using Blood Derivatives: A Reality Check”, Anal. Chem., 96, 957-965, 2024. Editors’ Choice Open Access. Impact Factor: 7.4 (DOI: 10.1021/acs.analchem.3c02590)

12. Ravi Kumar Venkatraman, and A. J. Orr-Ewing*, “Solvent Effects on Ultrafast Photochemical Pathways”, Acc. Chem. Res., 54, 4383-4393, 2021. Impact Factor: 18.3 (DOI: 10.1021/acs.accounts.1c00549)

Graphical Abstract

Abstract: In this account, we highlight photochemical reactions that are widely replacing traditional organic syntheses, for example, in photoredox catalysis, and generally involve photoexcitation of molecular chromophores acting as a catalyst dissolved in a liquid solvent or complex solutions. The choice of solvent environment influences the outcomes of the photochemistry because solute−solvent interactions modify the energies of and crossings between electronic states of the chromophores, affecting the evolving structures of the photoexcited molecules. We discuss in this account how we use ultrafast spectroscopy to study the dynamics of these photoexcited molecules as they undergo structural and electronic changes, relax back to the ground state, dissipate their excess internal energy to the surrounding solvent, or undergo photochemical reactions. Read more

11. M. Kao, Ravi Kumar Venkatraman, M. Sneha, M. N. R. Ashfold and A. J. Orr-Ewing*, “Solvent Effects on the Photophysics and Photochemistry of Dimethylamino Hydroxybenzoyl Hexyl Benzoate, J. Phys. Chem. A, 125, 636-645, 2021. Impact Factor: 2.9 (DOI: 10.1021/acs.jpca.0c10313)

Video Abstract

10. Ravi Kumar Venkatraman and C. R. Baiz*, “Ultrafast dynamics at the lipid-water interface: DMSO modulates H-bond lifetimes”, Langmuir, 36, 6502-6511, 2020. Impact Factor: 3.9 (DOI: 10.1021/acs.langmuir.0c00870)

9. M. Kao, Ravi Kumar Venkatraman, M. N. R. Ashfold and A. J. Orr-Ewing*, “Effects of Ring Strain on the Ultrafast Photochemistry of Cyclic Ketones”, Chem. Sci., 11, 1991-2000, 2020. Impact Factor: 8.4 (DOI: 10.139/C9SC05208A)

8. Venkatraman Ravi Kumar* and A. J. Orr-Ewing*, “Photochemistry of Benzophenone in Solution: A Tale of Two Different Solvent Environments”, J. Am. Chem. Soc., 141, 15222-15229, 2019. Impact Factor: 15.0 (DOI: 10.1021/jacs.9b074047)

7. Ravi Kumar Venkatraman, S. Kayal, A. Barak, A. J. Orr-Ewing* and S. Umapathy*, “Intermolecular Hydrogen Bonding Controlled Intersystem Crossing Rates of Benzophenone”, J. Phys. Chem. Lett., 9, 1642-1648, 2018. Impact Factor: 5.7 (DOI: 10.1021/acs.jpclett.8b00345)

6. K. Roy, S. Kayal, Venkatraman Ravi Kumar, A. Beeby, F. Ariese and S. Umapathy*, “Understanding Ultrafast Dynamics of Conformation Specific Photo-Excitation: A Femtosecond Transient Absorption and Ultrafast Raman Loss Study”, J. Phys. Chem. A, 121, 6538-6546, 2017. Impact Factor: 2.9 (DOI: 10.1021/acs.jpca.7b03893)

5. Venkatraman Ravi Kumar and S. Umapathy*, “Solvent Effects on the Structure of the Triplet Excited State of Xanthone: A Time-Resolved Resonance Raman Study”, J. Raman Spectrosc., 47, 1220-1230, 2016. Impact Factor: 2.5 (DOI: 10.1002/jrs.4954)

4. Venkatraman Ravi Kumar, F. Ariese and S. Umapathy*, “Triplet Excited Electronic State Switching Induced by Hydrogen bonding: A transient absorption spectroscopy and time-dependent DFT”, J. Chem. Phys., 144, 114301, 2016. Impact Factor: 4.4 (DOI: 10.1063/1.4943514)

3. Venkatraman Ravi Kumar, C. Verma* and S. Umapathy*, “Molecular Dynamics and Simulation Study on the Electronic and Vibrational Solvatochromism of Benzophenone”, J. Chem. Phys., 144, 064302, 2016. Impact Factor: 4.4 (DOI: 10.1063/1.4941058)

2. Ravi Kumar Venkatraman, N. Rajkumar, F. Ariese and S. Umapathy*, “Direct Observation of Thermal Equilibrium of Excited Triplet States of 9,10-Phenanthrenequinone. A Time-Resolved Resonance Raman Study”, J. Phys. Chem. A, 119, 10147-10157, 2015. Impact Factor: 2.9 (DOI: 10.1021/acs.jpca.5b07972)

1. Venkatraman Ravi Kumar, N. Rajkumar and S. Umapathy*, “Solvatochromism of 9,10-phenanthrenequinone: An electronic and resonance Raman spectroscopic study”, J. Chem. Phys., 142, 024305, 2015. Impact Factor: 4.4 (DOI: 10.1063/1.4905126)