Dr. Tim Chung

  • Assistant Professor

    Office: 200 Weyandt Hall 
    Phone: 724-357-2118 
    Email: tim.chung@iup.edu
    Research Group website

    Fall 2019 Office Hours

    M, W: 10:30 a.m.–Noon
    R: 2:30–4:30 p.m.


    BS – General Biology, UC San Diego, 2011  
    PhD –  Chemistry, UCLA, 2017 
    Humboldt Postdoctoral Fellowship – Technische Universität München, Munich, Germany, 2017-19  


    Organic Chemistry

    Physical Organic Chemistry



    CHEM 231 — Organic Chemistry

    Research Interests

    My lab is interested in the interaction between sun-light (UV) and organic molecules.  Specifically, we are interested in using photochemistry of organic molecules in the solid state to break and form distinct bonds.  Through rational design of organic substrates, we are able to harness the excited energy from a photon to perform challenging transformations.  These set of organic photo-reactions will have implications in green chemistry, environmentally friendly methods, high selectivity, as well as catalyst and solvent free protocols.


    1. Ishikawa, H.; Chung, T. S.; Fukuhara, G.; Shigemitsu, H.; Kida, ; Bach, T.; Mori, T. "Diastereoselective Photocycloaddition Reaction of Vinyl Ether Tethered to 1,4‐Naphthoquinone" ChemPhotoChem 2019,3, 243–250.

    2. Park, J. H.; Chung, T. S.; Hipwell, V. M.; Rivera, E.; Garcia-Garibay, M. A. “Transient Kinetics and Quantum Yield Studies of Nanocrystalline a-Phenyl-Substituted Ketones: Sorting Out Reactions from Singlet and Triplet Excited States” J. Am. Chem. Soc. 2018140, 8192-8197.

    3. Hörmann, F. M.Chung, T. S.; Rodriguez, E.; Jakob, M.; Bach, T. “Evidence for Triplet Sensitization in the Visible-Light Induced [2+2] Photocycloaddition of Eniminium Ions” Angew. Chem. Int. Ed. 201857, 827-831.

    4. Jin, M.; Chung, T. S.; Seki, T.; Ito, H.; Garcia-Garibay, M. A. “Phosphorescence Control Mediated by Molecular Rotation and Aurophilic Interactions in Amphidynamic Crystals of 1,4-Bis[tri-(p-fluorophenyl)phosphane-gold(I)-ethynyl]benzene” J. Am. Chem. Soc. 2017139, 18115−18121.

    5. Chung, T. S.; Park, J. H.; Garcia-Garibay, M. A. “Triplet Sensitize Photodenitrogenation of Δ2-1,2,3-Triazolines to Form Aziridines in Solution and in the Crystalline State: Observation of the Triplet 1,3-Alkyl-aminyl Biradical” J. Org. Chem. 201782, 12128−12133.

    6. Park, J. H.; Hughs, M.; Chung, T. S.; Ayitou, A. J.-L.; Breslin, V. M.; Garcia-Garibay, M.A “Generation and Reactivity Studies of Diarylmethyl Radical Pairs in Crystalline Tetraphenylacetones via Laser Flash Photolysis Using Nanocrystalline Suspensions” J. Am. Chem. Soc. 2017, 139, 13312−13317.

    7. Chung, T. S.; Xue, Y.; Carranza, A.; Garcia-Garibay, M. A. “Stereospecific Photochemistry of Δ2 -1,2,3-Triazolines in Solution and in the Solid State: Scope and Mechanistic Studies” Photochem. Photobiol. Sci. 201716, 1458–1463.

    8. Chung, T. S.; Ayitou, A. J.-L.; Park, J.; Breslin, V. M.; Garcia-Garibay, M.A. “Photochemistry and Transmission Pump−Probe Spectroscopy of 2‑Azidobiphenyls in Aqueous Nanocrystalline Suspensions: Simplified Kinetics in Crystalline Solids” J. Phys. Chem. Lett. 20178, 1845–1850.

    9. Cifelli, J. L.; Chung, T. S.; Liu, H.; Prangkio, P.; Mayer, M.; Yang, J.  “Benzothiazole Amphiphiles Ameliorate Amyloid-beta Related Cell Toxicity and Oxidative Stress” ACS Chem. Neurosci.20166, 682-688.

    10. Cifelli, J. L.; Dozier, L.; Chung, T. S.; Patrick, G. N.; Yang, J.  “Benzothiazole Amphiphiles Promote the Formation of Dendritic Spines in Primary Hippocampal Neurons” J. Biol. Chem. 2016291, 11981-11992.

    11. Staehle, I. O.; Chung, T. S.; Stopin, A.; Vadehra, G. S.; Hsieh, S. I.; Gibson, J. H.; Garcia-Garibay, M. A. “An Approach to Enhance the Safety Culture of an Academic Research Laboratory by Addressing Behavioral Factors.” J. Chem. Educ. 201693, 217–222.

    12. Chung, T. S.; Lopez, S. A.; Houk, K. N.; Garcia-Garibay, M. A. “Stereospecific Synthesis of Substituted Aziridines by a Crystal-to-Crystal Photodenitrogenation of Δ2-1,2,3-Triazolines.” Org. Lett. 201517, 4568–4571.

    denotes equal contribution