Samuel Griffith Shepard

Works (6)

Updated: July 5th, 2023 14:22

2021 article

A biohybrid strategy for enabling photoredox catalysis with low-energy light

Cesana, P. T., Li, B. X., Shepard, S. G., Ting, S. I., Hart, S. M., Olson, C. M., … Schlau-Cohen, G. S. (2021, November 15). Chem, Vol. 1.

By: P. Cesana*, B. Li*, S. Shepard n , S. Ting *, S. Hart *, C. Olson *, J. Alvarado *, M. Son * ...

topics (OpenAlex): Electrocatalysts for Energy Conversion; CO2 Reduction Techniques and Catalysts; Photosynthetic Processes and Mechanisms
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (Web of Science; OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: February 7, 2022

2020 article

Long-Lived Mixed 2MLCT/MC States in Antiferromagnetically Coupled d3 Vanadium(II) Bipyridine and Phenanthroline Complexes

Dill, R. D., Portillo, R. I., Shepard, S. G., Shores, M. P., Rappé, A. K., & Damrauer, N. H. (2020, September 4). Inorganic Chemistry, Vol. 59, pp. 14706–14715.

By: R. Dill *, R. Portillo*, S. Shepard* , M. Shores *, A. Rappé * & N. Damrauer *

topics (OpenAlex): Magnetism in coordination complexes; Photochemistry and Electron Transfer Studies; Metal-Catalyzed Oxygenation Mechanisms
TL;DR: Transient absorption studies of the vanadium(II) species probing in the visible and near-IR, in combination with spectroelectrochemical techniques and computational chemistry, lead to the conclusion that long-lived states with MLCT character are rare in first-row transition-metal complexes. (via Semantic Scholar)
Source: ORCID
Added: February 12, 2022

2020 journal article

Photochemical Upconversion in Water Using Cu(I) MLCT Excited States: Role of Energy Shuttling at the Micellar/Water Interface

ACS Applied Energy Materials, 3(12), 12557–12564.

By: R. Fayad n , A. Bui*, S. Shepard n  & F. Castellano n 

author keywords: photochemical upconversion; triplet-triplet annihilation; copper(I) MLCT excited states; earth-abundant photosensitizer; energy transfer
topics (OpenAlex): Luminescence and Fluorescent Materials; Perovskite Materials and Applications; Radical Photochemical Reactions
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries, ORCID, Crossref
Added: December 15, 2020

2017 article

A Synthetically Tunable System To Control MLCT Excited-State Lifetimes and Spin States in Iron(II) Polypyridines

Fatur, S. M., Shepard, S. G., Higgins, R. F., Shores, M. P., & Damrauer, N. H. (2017, March 1). Journal of the American Chemical Society, Vol. 3, pp. 4493–4505.

By: S. Fatur *, S. Shepard* , R. Higgins *, M. Shores * & N. Damrauer *

topics (OpenAlex): Lanthanide and Transition Metal Complexes; Porphyrin and Phthalocyanine Chemistry; Radical Photochemical Reactions
TL;DR: It is found that increasing the amount of steric strain serves to extend the lifetime of the 5,7MLCT from 14.0 ps for [Fe(dftpy)2]2+ to the largest known value at 17.4 ps for[Fe(dbtpy]2+. (via Semantic Scholar)
Source: ORCID
Added: January 6, 2022

2016 article

Highly Strained Iron(II) Polypyridines: Exploiting the Quintet Manifold To Extend the Lifetime of MLCT Excited States

Shepard, S. G., Fatur, S. M., Rappé, A. K., & Damrauer, N. H. (2016, February 10). Journal of the American Chemical Society, Vol. 138, pp. 2949–2952.

By: S. Shepard* , S. Fatur *, A. Rappé * & N. Damrauer *

topics (OpenAlex): Magnetism in coordination complexes; Metal-Catalyzed Oxygenation Mechanisms; Porphyrin and Phthalocyanine Chemistry
TL;DR: Evidence is presented that the quintet metal-to-ligand charge-transfer excited state ((5) MLCT) can be accessed via visible light absorption and that the thermalized (5,7)MLCT is long-lived at 16 ps, representing a > 100 fold increase compared to the (1,3)ML CT within species such as [Fe(bpy)3](2+). (via Semantic Scholar)
Source: ORCID
Added: January 6, 2022

2016 article

Uncovering the Roles of Oxygen in Cr(III) Photoredox Catalysis

Higgins, R. F., Fatur, S. M., Shepard, S. G., Stevenson, S. M., Boston, D. J., Ferreira, E. M., … Shores, M. P. (2016, March 31). Journal of the American Chemical Society, Vol. 138, pp. 5451–5464.

By: R. Higgins *, S. Fatur *, S. Shepard* , S. Stevenson *, D. Boston *, E. Ferreira *, N. Damrauer *, A. Rappé *, M. Shores *

topics (OpenAlex): Advanced Photocatalysis Techniques; Radical Photochemical Reactions; Catalytic Processes in Materials Science
TL;DR: The key finding is that oxygen acts as a renewable energy and electron shuttle following photoexcitation of the Cr(III) catalyst, providing insight into how oxygen can participate as a sustainable reagent in photocatalysis. (via Semantic Scholar)
Source: ORCID
Added: January 6, 2022

Employment

Updated: February 4th, 2026 07:49

2025 - present

Allegheny College Meadville, Pennsylvania, US
Assistant Professor Chemistry

2022 - 2025

Haverford College Philadelphia, Pennsylvania, US
Visiting Assistant Professor Chemistry

2019 - 2022

NC State University Raleigh, NC, US
Postdoc Chemistry

Education

Updated: October 24th, 2019 11:18

2012 - 2019

University of Colorado Boulder Boulder, CO, US
PhD Chemistry

2007 - 2011

Amherst College Amherst, MA, US
BA Chemistry

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