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Research @ UVA

65. Metal-Free Homogeneous O₂ Reduction by an Iminium-Based Electrocatalyst

Cook, E.N.; Davis, A.E.; Hilinski, M.K.*; Machan, C.W.* J. Am. Chem. Soc. 2024, DOI: 10.1021/jacs.3c14549.

64. Controlling Product Selectivity During Dioxygen Reduction with Mn Complexes Using Pendent Proton Donor Relays and Added Base

Cook, E.N.; Coulter, I.M.; Dickie, D.A.; Machan, C.W.* Chem. Sci. 2024, DOI: 10.1039/D3SC02611F.

63. Photoluminescence Switching in Quantum Dots Connected with Fluorinated and Hydrogenated Photochromic Molecules

Sarabamoun, E.S.; Bietch, J.M.; Aryal, P.; Reid, A.G.; Curran, M.; Johnson, G.; Tsai, E.H.R.; Machan, C.W.; Wang, G.; Choi, J. RSC Adv. 2024, DOI: 10.1039/D3RA07539G.

62. Solution Shearing of Zirconium (Zr)-Based Metal–Organic Frameworks NU-901 and MOF-525 Thin Films for Electrocatalytic Reduction Applications

Verma, P.K.; Koellner, C.A.; Hall, H.; Phister, M.R.; Stone, K.H.; Nichols, A.W.; Dhakal, A.; Ashcraft, E.; Machan, C.W.; Giri, G.* ACS Appl. Mater. Interfaces 2023, DOI: 10.1021/acsami.3c12011

61. Sterically Attenuated Electronic Communication in Cobalt Complexes of Meridional Isoquinoline-Derived Ligands for Applications in Electrocatalysis

Reid, A.G.; Moberg, M.E.; Koellner, C.A.; Machan, C.W.*; Thornton, D.A.; Dickenson, J.C.; Stober, J.J.; Turner, D.A.; Tarring, T.J.; Brown, C.A.; Harrison, D.P.* J. Chem. Phys. 2023, DOI: 10.1063/5.0174177

60. Co-Electrocatalytic CO₂ Reduction Mediated by a Dibenzophosphole Oxide and a Chromium Complex

Koellner, C.A.; Reid, A.G.; Machan, C.W.* Chem. Commun. 2023 DOI: 10.1039/D3CC00166K

59. Comparisons of bpy and phen Ligand Backbones in Cr-Mediated (Co-)Electrocatalytic CO₂ Reduction

Reid, A.G.; Moberg, M.E.; Koellner, C.A.; Moreno, J.J.; Hooe, S.L.; Baugh, K.R.; Dickie, D.A.; Machan, C.W.* Organometallics 2023 DOI: 10.1021/acs.organomet.2c00600

58. Redox Mediators in Homogeneous Co-Electrocatalysis

Reid, A.G. and Machan, C.W. J. Am. Chem. Soc. 2023 DOI: 10.1021/jacs.2c10033

57. Electrocatalytic Hydrogen Evolution Reaction by a Ni(N₂O₂) Complex Based on 2,2′-bipyridine

Dressel, J.M.; Cook, E.N.; Hooe, S.L.; Moreno, J.J.; Dickie, D.A.; Machan, C.W. Inorg. Chem. Front. 2023 DOI: 10.1039/D2QI01928K

*Frontiers Emerging Investigator Series

56. Homogeneous Electrocatalytic Reduction of CO₂ by a CrN₃O Complex: Electronic Coupling with a Redox-Active Terpyridine Fragment Favors Selectivity for CO

Reid, A.G.; Hooe, S.L.; Moreno, J.J.; Dickie, D.A.; Machan, C.W.* Inorg. Chem. 2022 DOI: 10.1021/acs.inorgchem.2c02013 

55. Homogeneous Catalysis of Dioxygen Reduction by Molecular Mn Complexes

Cook, E.N.; Machan, C.W.* Chem. Commun. 2022 DOI: 10.1039/D2CC04628H

54. Inverse Potential Scaling in Co-Electrocatalytic Activity for CO₂ Reduction Through Redox Mediator Tuning and Catalyst Design

Reid, A.G.; Moreno, J.J.; Hooe, S.L.; Baugh, K.R.; Thomas, I.H.; Dickie, D.A.; Machan, C.W.* Chem. Sci. 2022 DOI: 10.1039/D2SC03258A

53. Homogeneous Catalytic Reduction of O₂ to H₂O by a Terpyridine-Based FeN₃O Complex

Cook, E.N.; Hooe, S.L.; Dickie, D.A.; Machan, C.W.* Inorg. Chem. 2022 DOI: 10.1021/acs.inorgchem.2c00524
**Featured Article

52. Bioinspired Mononuclear Mn Complexes for O₂ Activation and Biologically Relevant Reactions

Cook, E.N.; Machan, C.W.* Dalton Trans. 2021 DOI: 10.1039/D1DT03178C

**HOT Article

51. Mediated Inner-Sphere Electron Transfer Induces Homogeneous Reduction of CO₂ via Through-Space Electronic Conjugation

Hooe, S.L.; Moreno, J. J.; Reid, A.G.; Cook, E.N.; Machan, C.W.* Angew. Chemie, Int. Ed. 2022 DOI: 10.1002/anie.202109645

Corrigendum 61: e202205139

**VIP Designation

50. Catalytic Reduction of Dioxygen to Water by a Bioinspired Non-Heme Iron Complex via a 2+2 Mechanism

Cook, E.N.; Dickie, D.A.; Machan, C.W.* J. Am. Chem. Soc. 2021 DOI: 10.1021/jacs.1c04572

49. Pendent Relay Enhances H₂O₂ Selectivity during Dioxygen Reduction Mediated by Bipyridine-Based Co–N₂O₂ Complexes

Nichols, A.W.; Cook, E.N.; Gan, Y.J.; Miedaner, P.R.; Dressel, J.M.; Dickie, D.A.; Shafaat, H.S.; Machan, C.W.* J. Am. Chem. Soc. 2021 DOI: 10.1021/jacs.1c03381

48. Non-covalent Assembly of Proton Donors and p-benzoquinone Anions for Co-electrocatalytic Reduction of Dioxygen

Hooe, S.L.; Cook, E.N.; Reid, A.G.; Machan, C.W.* Chem. Sci. 2021 DOI: 10.10139/D1SC01271A

47. Electrocatalytic Water Oxidation by a Trinuclear Copper(II) Complex

Geer, A. M.; Musgrave III, C.; Webber, C.; Nielsen, R. J.; McKeown, B. A.; Liu, C.; Schleker, P. P. M.; Jakes, P.; Jia, X.; Dickie, D. A.; Granwehr, J.; Zhang, S.; Machan, C. W.^*; Goddard, W. A.^*; Gunnoe, T. B.^*, ACS Catal. 2021 DOI: 10.1021/acscatal.1c01395.

46. DFT Study on the Electrocatalytic Reduction of CO₂ to CO by a Molecular Chromium Complex

Moreno, J.J; Hooe, S.H.; Machan, C.W.* Inorg. Chem. 2021 DOI: 10.1021/acs.inorgchem.0c03136

45. Soluble, Crystalline, and Thermally Stable Alkali CO₂^– and Carbonite (CO₂^2–) Clusters Supported by Cyclic(Alkyl)(Amino) Carbenes

Freeman, L.A.; Obi, A.D.; Machost, H.R.; Molino, A.; Nichols, A.W.; Dickie, D.A.; Wilson, D.J.D.*; Machan, C.W.*; Gilliard Jr., R.J.* Chem. Sci. 2021 DOI: 10.1039/D0SC06851A

44. Reduction of dioxygen to water by a Co(N₂O₂) complex with a 2,2′-bipyridine backbone​

Nichols, A.W.; Kuehner, J.S.; Huffman, B.L.; Miedaner, P.R.; Dickie, D.A.; Machan, C.W.* Chem. Commun. 2021 DOI: 10.1039/D0CC06763F

43. Controlling Polymorphism and Orientation of NU-901/NU-1000 Metal–Organic Framework Thin Films

Verma, P.K.; Huelsenbeck, L.; Nichols, A.W.; Islamoglu, T.; Heinrich, H.; Machan, C.W.; Giri, G.* Chem. Mater. 2020 DOI: 10.1021/acs.chemmater.0c03539

42. Mechanistic Insight into Initiation and Regioselectivity in the Copolymerization of epoxides and anhydrides by Al Complexes

Popowski, Y.; Moreno, J.J.; Nichols, A.W.; Hooe, S.L.; Bouchey, C.J.; Rath, N.P.; Machan, C.W.*; Tolman, W.B.* Chem. Commun. 2020 DOI: 10/10339/D0CC05652A

41. Electrocatalytic CO₂ Reduction to Formate with Molecular Fe(III) Complexes Containing Pendent Proton Relays

Nichols, A.W.; Hooe, S.L.; Kuehner, J.S.; Dickie, D.A.; Machan, C.W.* Inorg. Chem. 2020 DOI: https://doi.org/10.1021/acs.inorgchem.9b03341

40. Advances in the Molecular Catalysis of Dioxygen Reduction

Machan, C.W.* ACS Catal. 2020 DOI: 10.1021/acscatal.9b04477 

39. Electrochemical CO₂ Reduction in a Continuous Non-Aqueous Flow Configuration with [Ni(cyclam)]²⁺ Catalyst​

Jiang, C.; Nichols, A.W.; Walzer, J.F.; Machan, C.W.* Inorg. Chem. 2020 DOI: 10.1021/acs.inorgchem.9b03171

38. Highly Efficient Electrocatalytic Reduction of CO₂ to CO by a Molecular Chromium Complex​

Hooe, S.L.; Dressel, J.M.; Dickie, D.A.; Machan, C.W.* ACS Catal. 2020 DOI: 10.1021/acscatal.9b04687

37. Catalytic Reduction of O₂ to H₂O₂ via a Mn Complex

Hooe, S.L.; Machan, C.W.* Trends in Chemistry - Mechanism of the Month 2019 DOI: https://doi.org/10.1016/j.trechm.2019.09.002

36. Secondary-Sphere Effects in Molecular Electrocatalytic CO₂ Reduction

Nichols, A.W.; Machan, C.W.* Front. Chemi. - Inorg. Chem. 2019 DOI: 10.3389/fchem.2019.00397

35. Electrocatalytic Reduction of Dioxygen by Mn(III) meso-Tetra(N-methylpyridinium-4-yl)porphyrin in Universal Buffer

Lieske, L.E.; Hooe, S.L.; Nichols, A.W.; Machan, C.W.* Dalton Trans. 2019 DOI: 10.1039/C9DT01436E

**HOT Article

34. Metal-Organic Frameworks as Porous Templates for Enhanced Cobalt Oxide Electrocatalyst Performance 

Huelsenbeck, L.; Hooe, S.L.; Ghorbanpour, A.; Conley, A.M.; Heinrich, H.; Machan, C.W.*; Giri, G.* ACS Appl. Energy Mat. 2019 DOI: 10.1021/acsaem.9b00127

33. A Look at Periodic Trends in d-Block Molecular Electrocatalysts for CO₂ Reduction

Jiang, C.; Nichols, A.W.; Machan, C.W.* Dalton Trans. 2019 DOI: 10.1039/C9DT00491B

32. Recent Advances in Spectroelectrochemistry Related to Molecular Catalytic Processes

Machan, C.W.* Curr. Opin. Electrochem. 2019 DOI: 10.10.1016/j.coelec.2019.03.010

31. Metal-Free Electrochemical Reduction of Carbon Dioxide Mediated by Cyclic(Alkyl)(Amino) Carbenes

Lieske, L.E.†; Freeman, L.A.†; Wang, G.; Dickie, D.A.; Gilliard Jr., R.J.*; Machan, C.W. * Chem. – Eur. J. 2019 DOI: 10.1002/chem.201900316

30. Dioxygen Reduction to Hydrogen Peroxide by a Molecular Mn Complex: Mechanistic Divergence Between Homogeneous and Heterogeneous Reductants

Hooe, S.L. and Machan, C.W. J. Am. Chem. Soc. 2019 DOI: 10.1021/jacs.8b13373

29. Nitric oxide activation facilitated by cooperative multimetallic electron transfer within an iron-functionalized polyoxovanadate–alkoxide cluster​

Li, F.; Meyer, R.L.; Carpenter, S.H.; VanGelder, L.E.; Nichols, A.W.; Machan, C.W.; Neidig, M.L.; Matson, E.M.* Chem. Sci. 2018 DOI: 10.1039/C8SC00987B 

28. Electrochemical Reduction of Carbon Dioxide with a Molecular Polypyridyl Nickel Complex

Lieske, L.E.; Rheingold, A.L.; Machan, C.W.* Sust. Energy Fuels 2018 DOI: 10.1039/C8SE00027A

27. Reversible Modulation of the Redox Characteristics of Acid-Sensitive Molybdenum and Tungsten Scorpionate Complexes

Heyer, A.J.; Shivokevich, P.J.; Hooe, S.L.; Welch, K.D.; Harman, W.D.; Machan, C.W. Dalton Trans. 2018 DOI:10.1039/C8DT00598B

26. Electrocatalytic Reduction of CO₂ to Formate by an Iron Schiff Base Complex

Nichols, A.W.; Chatterjee, S.; Sabat, M.; Machan, C.W. Inorg. Chem. 2018, DOI: 10.1021/acs.inorgchem.7b02955

25. Electrocatalytic Reduction of Dioxygen to Hydrogen Peroxide by a Molecular Manganese Complex with a Bipyridine-Containing Schiff Base Ligand

Hooe, S.L.; Rheingold, A.L.; Machan, C.W. J. Am. Chem. Soc. 2018, DOI: 10.1021/jacs.7b09027

 

Postdoctoral Research at the University of California – San Diego

24. Charged Macromolecular Rhenium Bipyridine Catalysts with Tunable CO₂ Reduction Potentials
Sahu, S.; Cheung, P.L.; Machan, C.W.; Chabolla, S.A.; Kubiak, C.P.; Gianneschi, N.C. Chem. – Eur. J. 2017, DOI: 10.1002/chem.201701901

23. Concerted One-Electron Two-Proton Transfer Processes in Models Inspired by the Tyr-His Couple of Photosystem II
Huynh, M.R.; Mora, S.J.; Villalba, M.; Tejeda-Ferrari, M.E.; Liddell, P.A; Cherry, B.R.; Teillout, A.-L.; Machan, C.W.; Kubiak, C.P.; Gust, D.; Moore, T.A.; Hammes-Schiffer, S.; Moore, A.L. ACS Cent. Sci. 2017, DOI: 10.1021/acscentsci.7b00125

22. Bio-inspired CO₂ reduction by a rhenium tricarbonyl bipyridine-based catalyst appended to amino acids and peptidic platforms: incorporating proton relays and hydrogen-bonding functional groups
Chabolla, S.A.; Machan, C.W.; Yin, J.; Dellamary, E.A.; Sahu, S.; Gianneschi, N.C.; Gilson, M.K.; Tezcan, F.A.; Kubiak, C.P. Faraday Discuss. 2017, DOI: 10.1039/c7fd00003k

21. Electrocatalytic Reduction of Carbon Dioxide with Mn(terpyridine) Carbonyl Complexes
Machan, C.W.; Kubiak, C.P. Dalton Trans. 2016, 45, 17179

20. Interrogating Heterobimetallic Co-Catalytic Responses for the Electrocatalytic Reduction of CO₂ Using Supramolecular Assembly
Machan, C.W.; Kubiak, C.P. Dalton Trans. Special Issue on 'Reactions Facilitated by Ligand Design' 2016, 45, 15942

19. Improving the Efficiency and Activity of Electrocatalysts for the Reduction of CO₂ Through Supramolecular Assembly with Amino Acid-Modified Ligands
Machan, C.W.; Yin, J.; Chabolla, S.A.; Gilson, M.K.; Kubiak, C.P. J. Am. Chem. Soc. 2016, 138, 8184

18. Re(I) NHC Complexes for Electrocatalytic Conversion of CO₂
Stanton III, C.J.; Machan, C.W.; Vandezande, J.E.; Jin, T.; Majetich, G.; Schaefer III, H.F.; Kubiak, C.P.; Li, G.; Agarwal, J. Inorg. Chem. 2016, 55, 3136

17. Photocatalytic Reduction of Carbon Dioxide to CO and HCO₂H Using fac-Mn(CN)(bpy)(CO)₃
Cheung, P.L.; Machan, C.W.; Malkhasian, Y.S.; Agarwal, J.; Kubiak, C.P. Inorg. Chem. 2016, 55, 3192

16. Rapid synthesis of redox-active dodecaborane B₁₂(OR)₁₂ clusters under ambient conditions
Wixtrom, A.I.; Shao, Y.; Jung, D.; Machan, C.W.; Kevork, S.N.; Qian, E.A.; Axtell, J.C.; Khan, S.I.; Kubiak, C.P.; Spokoyny, A.M. Inorg. Chem. Front. (Emerging Investigator Issue) 2016, 3, 711

15. Orientation of Immobilized Cyano-Substituted Bipyridine Re(I) fac-Tricarbonyl Electrocatalysts on Au Surfaces
Clark, M.L.; Rudshteyn, B.; Ge, A.; Chabolla, S.A.; Machan, C.W.; Psciuk, B.T.; Song, J.; Canzi, G.; Lian, T.; Batista, V.S.; Kubiak, C.P. J. Phys. Chem. C 2016, 120, 1657

14. Electrocatalytic Reduction of Carbon Dioxide by Mn(CN)(2,2ʹ-bipyridine(CO)₃: CN Coordination Alters Mechanism
Machan, C.W.; Stanton III, C.J.; Vandezande, J.E.; Majetich, G.F.; Schaefer III, H.F; Kubiak, C.P.; Agarwal, J. Inorg. Chem. 2015, 54, 8849

13. Reductive Disproportionation of Carbon Dioxide by an Alkyl-Functionalized Pyridine Monoimine Re(I) fac-tricarbonyl Electrocatalyst
Machan, C.W.; Chabolla, S.A.; Kubiak, C.P. Organometallics 2015, 34, 4678

12. A Molecular Ruthenium Electrocatalyst for the Reduction of Carbon Dioxide to CO and Formate
Machan, C.W.; Sampson, M.D.; Kubiak, C.P. J. Am. Chem. Soc. 2015, 137, 8564

11. Synthesis, Spectroscopy, and Electrochemistry of (α-diimine)M(CO)3Br, M = Mn, Re, Complexes: Ligands Isoelectronic to Bipyridyl Show Differences in CO₂ Reduction
Vollmer, M.; Machan, C.W.; Clark, M.L.; Antholine, W.; Agarwal, J.; Schaefer, H.F.; Kubiak, C.P; Walensky, J. Organometallics 2015, 34, 3

10. Supramolecular Assembly Promotes the Electrocatalytic Reduction of Carbon Dioxide by Re(I) Bipyridine Catalysts at a Lower Overpotential
Machan, C.W.; Chabolla, S.A.; Yin, J.; Gilson, M.K.; Tezcan, F.A.; Kubiak, C.P. J. Am. Chem. Soc. 2014, 136, 14598

9. Combined Steric and Electronic Effects of Positional Substitution on Dimethyl-Bipyridine Rhenium(I) Tricarbonyl Electrocatalysts for the Reduction of CO₂
Chabolla, S.A.; Dellamary, E.A.; Machan, C.W.; Tezcan, F.A.; Kubiak, C.P. Inorg. Chim. Acta 2014, 422, 109

8. Developing a Mechanistic Understanding of Molecular Electrocatalysts for CO₂ Reduction Using Infrared Spectroelectrochemistry
Machan, C.W.; Sampson, M.D.; Chabolla, S.A.; Dang, T.; Kubiak, C.P. Organometallics 2014, 33, 4550

Graduate Research at Northwestern University

7. General Strategy for the Synthesis of Rigid Higher-Order Platinum(II) Complexes via the Weak-Link Approach: Tweezers, Triple-Layers and Macrocycles
Kennedy, R.D.; Machan, C.W.; McGuirk, C.M.; Rosen, M.S.; Stern, C.L.; Mirkin, C.A. Inorg. Chem. 2013, 52, 5876

6. One-Pot Synthesis of an Fe(II) Bisterpyridine Complex with Allosterically Regulated Electronic Properties
Machan, C.W.; Adelhardt, M.; Sarjeant, A.A.; Stern, C.L.; Sutter, J.; Meyer, K.; Mirkin, C. A. J. Am. Chem. Soc. 2012, 134, 16921

5. Crystallographic Snapshots of the Bond-Breaking Isomerization Reactions of Ni(II) Complexes with Hemilabile Ligands
Machan, C.W.; Lifschitz, A.M.; Sarjeant, A.A.; Stern, C.L.; Mirkin, C.A.; Angew. Chem., Int. Ed. 2012, 51, 1469

4. A Coordination Chemistry Dichotomy for Icosahedral Carborane-Based Ligands
Spokoyny, A.M.; Machan, C.W.; Clingerman, D.J.; Rosen, M.S.; Wiester, M.J.; Kennedy, R.D.; Sarjeant, A.A.; Stern, C.L.; Mirkin, C.A.; Nat. Chem. 2011, 3, 590 Highlight by A. Weller, ibid.

3. Plasticity of the Nickel (II) Coordination Environment in Complexes with Hemilabile Phosphino Thioether Ligands
Machan, C.W.; Spokoyny, A.M.; Jones, M.R.; Sarjeant, A.A.; Stern, C.L.; Mirkin, C.A. J. Am. Chem. Soc. 2011, 33, 3023

2. Chelating Effect as a Driving Force for the Selective Formation of Heteroligated Pt(II) Complexes with Bidentate Phosphino-Chalcoether Ligands
Rosen, M.S.; Spokoyny, A.M.; Machan, C.W.; Stern, C.; Sarjeant, A.A.; Mirkin, C.A.; Inorg. Chem. 2011, 50, 1411

1. Electronic Tuning of Nickel-Based Bis(dicarbollide) Redox Shutles in Dye-Sensitized Solar Cells
Spokoyny, A.M.; Li, T.C.; Farha, O.K.; Machan, C.W.; She, C.; Marks, T.J.; Hupp, J.T.; Mirkin, C.A.; Angew. Chem., Int. Ed. 2010, 49, 5339