I am a Postdoctoral Fellow working in the group of Prof. Danna Freedman at Northwestern. My research focuses on experimental synthetic chemistry under extremely high pressure, targeting the discovery of new materials that exhibit bulk properties such as permanent magnetism and superconductivity. We use diamond anvil cells and multi-anvil presses to access pressures in the range of 1–100 GPa.

Latest research highlight

Our recent publication in J. Am. Chem. Soc. was featured on the front cover of the September 26, 2018 issue. Jarosite is a hydrous sulfate mineral with the formula KFe3(OH)6(SO4)2. An interesting property of this compound is that its Fe ions form a perfect 2D kagomé lattice in the ab-plane, wherein the triangular coupling pathways lead to magnetic frustration. Magnetically frustrated systems are fascinating because they often lead to delicate quantum states that reveal a lot about the fundamental nature of electron pairing. We combined an assortment of cutting-edge beamline methods at the Advanced Photon Source to study the crystallographic, magnetic, and electronic properties of jarosite under extreme pressures, and we found that the interlayer interactions are in fact much more important than the intralayer interactions in determining the overall 3D magnetic ordering. This paper was also featured in a JACS Spotlight.


  1. Meyer,  N. A.; Wenz,  M. D.; Walsh,  J. P. S.; Jacobsen,  S. D.; Locock,  A. J.; Harris,  J. W. “Goldschmidtite, IMA 2018-034.” Eur. J. Mineral. 2018, 30, 879–884.
  2. Tamerius,  A. D.; Clarke,  S. M.; Gu,  M.; Walsh,  J. P. S.; Esters,  M.; Meng,  Y.; Hendon,  C. H.; Rondinelli,  J. M.; Jacobsen,  S. D.; Freedman,  D. E. “Discovery of Cu3Pb.” Angew. Chem., Int. Ed. 2018, 57, 12809–12813.
  3. Klein, R. A.; Walsh, J. P. S.; Clarke,  S. M.; Guo,  Y.; Bi,  W.; Fabbris,  G.; Meng,  Y.; Haskel,  D.; Alp,  E. E.; Van Duyne,  R. P.; Jacobsen,  S. D.; Freedman,  D. E. “Impact of pressure on magnetic order in jarosite.” J. Am. Chem. Soc. 2018, 140, 12001–12009.
  4. Walsh, J. P. S.; Freedman, D. E. “High-pressure synthesis: A new frontier in the search for next-generation intermetallic compounds.” Acc. Chem. Res. 2018, 51, 1315–1323.
  5. Dendrinou-Samara, C.; Walsh, J. P. S.; Muryn, C. A.; Collison, D.; Winpenny, R. E. P.; Tuna, F. “Evidence of spin canting, metamagnetism, negative coercivity and slow relaxation in a two-dimensional network of {Mn6} cages.” Eur. J. Inorg. Chem. 2018, 2018, 485–492.
  6. Clarke, S. M.; Amsler, M.; Walsh, J. P. S.; Yu, T.; Wang, Y.; Meng, Y.; Jacobsen, S. D.; Wolverton, C.; Freedman, D. E. “Creating binary Cu–Bi compounds via high-pressure synthesis: A combined experimental and theoretical study.” Chem. Mater. 2017, 29, 5276–5285.
  7. McAdams, S. G.; Ariciu, A.-M.; Kostopoulos, A. K.; Walsh, J. P. S.; Tuna, F. “Molecular single-ion magnets based on lanthanides and actinides: Design considerations and new advances in the context of quantum technologies.” Coord. Chem. Rev. 2017, 346, 216–239.
  8. Walsh, J. P. S.; Freedman, D. E. “Using supramolecular chemistry to build quantum logic gates.” Chem 2016, 1, 668–669.
  9. Walsh, J. P. S.; Clarke, S. M.; Meng, Y.; Jacobsen, S. D.; Freedman, D. E. “Discovery of FeBi2.” ACS Cent. Sci. 2016, 2 (11), 867–871.
  10. Clarke, S. M.; Walsh, J. P. S.; Amsler, M.; Malliakas, C. D.; Yu, T.; Goedecker, S.; Wang, Y.; Wolverton, C.; Freedman, D. E. “Discovery of a superconducting Cu–Bi intermetallic compound by high-pressure synthesis.” Angew. Chem., Int. Ed. 2016, 55 (43), 13446–13449.
  11. Overgaard, J.; Møller, L. H.; Borup, M. A.; Tricoire, M.; Walsh, J. P. S.; Diehl, M.; Rentschler, E. “Magnetism and variable temperature and pressure crystal structures of a linear oligonuclear cobalt bis-semiquinonate.” Dalton Trans. 2016, 45, 12924–12932.
  12. Naskar, J. P.; Biswas, C.; Bandyopadhyay, N.; Walsh, J. P. S.; Tuna, F.; Zhu, M.; Lu, L. “Oximato-bridged copper(II) compounds: Syntheses, molecular structures, magnetic, thermal and spectroscopic properties.” J. Coord. Chem. 2016, 69 (15), 2329–2341.
  13. Walsh, J. P. S.; Bowling, G.; Ariciu, A.-M.; Jailani, N. F. M.; Chilton, N. F.; Waddell, P. G.; Collison, D.; Tuna, F.; Higham, L. J. “Evidence of slow magnetic relaxation in Co(AcO)2(py)2(H2O)2.” Magnetochemistry 2016, 2 (2), 23.
  14. Gallagher, A. T.; Kelty, M. L.; Park, J. G.; Anderson, J. S.; Mason, J. A.; Walsh, J. P. S.; Collins, S. L.; Harris, T. D. “Dioxygen binding at a four-coordinate cobaltous porphyrin site in a metal–organic framework: structural, EPR, and O2 adsorption analysis.” Inorg. Chem. Front. 2016, 1 (3), 536–540.
  15. Walsh, J. P. S.; Meadows, S. B.; Ghirri, A.; Moro, F.; Jennings, M.; Smith, W. F.; Graham, D. M.; Kihara, T.; Nojiri, H.; Vitorica-Yrezabal, I. J.; Timco, G. A.; Collison, D.; McInnes, E. J. L.; Winpenny, R. E. P. “Electronic structure of a mixed-metal fluoride-centered triangle complex: A potential qubit component.” Inorg. Chem. 2015, 54 (24), 12019–12026.
  16. Goura, J.; Walsh, J. P. S.; Tuna, F.; Chandrasekhar, V. “Synthesis, structure, and magnetism of non-planar heptanuclear lanthanide(III) complexes.” Dalton Trans. 2015, 44 (3), 1142–1149.
  17. Goura, J.; Chakraborty, A.; Walsh, J. P. S.; Tuna, F.; Chandrasekhar, V. “Hexanuclear 3d–4f neutral Co(II)2Ln(III)4 clusters: Synthesis, structure and magnetism.” Cryst. Growth Des. 2015, 15 (17), 3157–3165.
  18. Goura, J.; Walsh, J. P. S.; Tuna, F.; Halder, R.; Maji, T. K.; Chandrasekhar, V. “P–C bond cleavage-assisted lanthanide phosphate coordination polymers.” Cryst. Growth Des. 2015, 15 (6), 2555–2560.
  19. Gingasu, D.; Mindru, I.; Culita, D. C.; Patron, L.; Calderon-Moreno, J. M.; Osiceanu, P.; Preda, S.; Oprea, O.; Parvulescu, V.; Teodorescu, V.; Walsh, J. P. S. “Structural, magnetic and catalytic properties of cobalt chromite obtained through precursor method.” Mater. Res. Bull. 2015, 62, 52–64.
  20. Gupta, S. K.; Kuppuswamy, S.; Walsh, J. P. S.; McInnes, E. J. L.; Murugavel, R. “Discrete and polymeric cobalt organophosphates: Isolation of a 3-D cobalt phosphate framework exhibiting selective CO2 capture.” Dalton Trans. 2015, 44 (12), 5587–5601.
  21. Chatelain, L.; Walsh, J. P. S.; Pécaut, J.; Tuna, F.; Mazzanti, M. “Self-assembly of a 3d–5f trinuclear single-molecule magnet from a pentavalent uranyl complex.” Angew. Chem., Int. Ed. 2014, 53 (49), 13434–13438.
  22. Overgaard, J.; Walsh, J. P. S.; Hathwar, V. R.; Jørgensen, M. R. V.; Hoffman, C.; Platts, J. A.; Piltz, R.; Winpenny, R. E. P. “Relationships between electron density and magnetic properties in water-bridged dimetal complexes.” Inorg. Chem. 2014, 53 (21), 11531–11539.
  23. Vaidya, S.; Upadhyay, A.; Singh, S. K.; Gupta, T.; Tewary, S.; Langley, S. K.; Walsh, J. P. S.; Murray, K. S.; Rajaraman, G.; Shanmugam, M. “A synthetic strategy for switching the single ion anisotropy in tetrahedral Co(II) complexes.” Chem. Commun. 2014, 51 (18), 3739–3742.
  24. Walsh, J. P. S.; Sproules, S.; Chilton, N. F.; Barra, A.-L.; Timco, G. A.; Collison, D.; McInnes, E. J. L.; Winpenny, R. E. P. “On the possibility of magneto-structural correlations: Detailed studies of dinickel carboxylate complexes.” Inorg. Chem. 2014, 53 (16), 8464–8472.
  25. Goura, J.; Walsh, J. P. S.; Tuna, F.; Chandrasekhar, V. “Tetranuclear lanthanide(III) complexes in a seesaw geometry: Synthesis, structure, and magnetism.” Inorg. Chem. 2014, 53 (7), 3385–3391.