Patrick Hewitt

Works (11)

Updated: November 13th, 2023 08:06

2023 article

Competitive reversed quartet mechanisms for photogenerated ground state electron spin polarization

Kirk, M. L., Shultz, D. A., Hewitt, P., Marri, A. R., & Est, A. (2023, August 8). CHEMICAL SCIENCE, Vol. 8.

By: M. Kirk, D. Shultz , P. Hewitt, A. Marri  & A. Est

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Sources: Web Of Science, NC State University Libraries
Added: September 25, 2023

2023 journal article

Competitive reversed quartet mechanisms for photogenerated ground state electron spin polarization

CHEMICAL SCIENCE, 14(36), 9689–9695.

By: M. Kirk *, D. Shultz n , P. Hewitt n, A. Marri n  & A. Est *

Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 31, 2023

2022 article

Excited State Exchange Control of Photoinduced Electron Spin Polarization in Electronic Ground States

Kirk, M. L., Shultz, D. A., Hewitt, P., & Est, A. (2022, January 19). JOURNAL OF PHYSICAL CHEMISTRY LETTERS, Vol. 1.

By: M. Kirk *, D. Shultz n , P. Hewitt n & A. Est *

TL;DR: Ground state ESP is dependent on the magnitude of JSQ-NN, and it is postulate that this results from differences in 2T1 and 4T1 state mixing, which determines the 2T 1-4T1 energy gap. (via Semantic Scholar)
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Sources: Web Of Science, ORCID, NC State University Libraries
Added: January 20, 2022

2022 article

Excited State Magneto-Structural Correlations Related to Photoinduced Electron Spin Polarization

Kirk, M. L., Shultz, D. A., Hewitt, P., Chen, J., & Est, A. van der. (2022, July 8). JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol. 7.

By: M. Kirk *, D. Shultz n , P. Hewitt n, J. Chen * & A. Est *

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Sources: Web Of Science, ORCID, NC State University Libraries
Added: July 9, 2022

2022 journal article

Single-Photon-Induced Electron Spin Polarization of Two Exchange-Coupled Stable Radicals

Journal of the American Chemical Society, 144(46), 21005–21009.

By: M. Kirk *, D. Shultz n , A. Marri n , P. Hewitt n & A. van der Est *

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Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: November 15, 2022

2021 article

Chromophore-radical excited state antiferromagnetic exchange controls the sign of photoinduced ground state spin polarization

Kirk, M. L., Shultz, D. A., Hewitt, P., Stasiw, D. E., Chen, J., & Est, A. (2021, September 9). CHEMICAL SCIENCE, Vol. 9.

By: M. Kirk *, D. Shultz n , P. Hewitt n, D. Stasiw n, J. Chen * & A. Est *

TL;DR: It is proposed that the emissive polarization in 6-Me-mPh-Pt results from zero-field splitting induced transitions between the chromophoric 2T1 and 4T1 states, whereas predominant spin–orbit induced transitions around low-energy NN-based states give rise to the absorptive polarization observed for mPh- Pt. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries
Added: October 18, 2021

2021 journal article

Magnetic Exchange Coupling through the Nonalternant Cyclopentadienyl pi-System of Ferrocene

ORGANIC LETTERS, 23(21), 8235–8239.

By: P. Hewitt n, D. Shultz n  & M. Kirk *

TL;DR: This work presents magnetic exchange coupling in two semiquinone-based biradicals: 1,3-SQ2Fc has two semquinone radicals attached to the one- and three-positions of the same cyclopentadienyl ligand (a nonalternant π-system) of ferrocene. (via Semantic Scholar)
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Sources: Web Of Science, ORCID, NC State University Libraries
Added: September 30, 2021

2021 journal article

Measuring plasma-generated center dot OH and O atoms in liquid using EPR spectroscopy and the non-selectivity of the HTA assay

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 54(14).

By: B. Myers n, P. Ranieri n, T. Smirnova n , P. Hewitt n, D. Peterson n, M. Quesada  n, E. Lenker n, K. Stapelmann n 

author keywords: atmospheric pressure plasma jet; atomic oxygen; hydroxyl radicals; hydrogen peroxide; reactive oxygen species; plasma-liquid chemistry; EPR spectroscopy
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Sources: Web Of Science, ORCID, NC State University Libraries
Added: January 9, 2021

2021 journal article

Metal Ion Control of Photoinduced Electron Spin Polarization in Electronic Ground States

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 143(28), 10519–10523.

By: M. Kirk *, D. Shultz n , J. Chen *, P. Hewitt n, D. Daley n, S. Paudel*, A. Der Est *

TL;DR: It is postulated that zero-field-splitting- induced transitions between the chromophoric 2T1 and 4T1 states (1-Pd and 1-Pt) and spin-orbit-induced transitions between 2T2 and NN-based quartet states ( 1-Tt) account for the differences in polarization. (via Semantic Scholar)
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Sources: Web Of Science, ORCID, NC State University Libraries
Added: July 13, 2021

2021 journal article

Rules for Magnetic Exchange in Azulene-Bridged Biradicals: Quo Vadis?

JOURNAL OF ORGANIC CHEMISTRY, 86(21), 15577–15587.

By: P. Hewitt n, D. Shultz n  & M. Kirk *

TL;DR: This work examines the structure, spectroscopy, and magnetic exchange coupling in two biradicals that possess nonalternant azulene π-system bridges and highlights the differences in exchange coupling mediated by azulenes compared to exchange couplingmediated by alternant π -systems. (via Semantic Scholar)
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Sources: Web Of Science, ORCID, NC State University Libraries
Added: October 15, 2021

2020 journal article

In Search of Stable, High-Spin Polymers

APPLIED MAGNETIC RESONANCE, 51(11), 1331–1341.

By: P. Hewitt n & D. Shultz n 

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Sources: Web Of Science, ORCID, NC State University Libraries
Added: November 16, 2020

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