Samuel Griffith Shepard

Works (6)

Updated: July 5th, 2023 14:22

2021 journal article

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

CHEM, 8(1), 174–185.

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

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 journal article

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

Inorganic Chemistry, 59(20), 14706–14715.

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

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
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 journal article

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

Journal of the American Chemical Society, 3(12), 4493–4505.

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

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 journal article

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

J. Am. Chem. Soc., 138(9), 2949–2952.

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

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 journal article

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

J. Am. Chem. Soc., 138(16), 5451–5464.

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

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: November 13th, 2022 22:55

2022 - present

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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