James Yarnell

Works (13)

Updated: July 5th, 2023 15:39

2023 article

Excited state processes of dinuclear Pt(II) complexes bridged by 8-hydroxyquinoline

Kromer, S., Roy, S., Yarnell, J. E., Taliaferro, C. M., & Castellano, F. N. (2023, March 1). DALTON TRANSACTIONS, Vol. 3.

By: S. Kromer n, S. Roy n, J. Yarnell n, C. Taliaferro n & F. Castellano n 

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Added: March 7, 2023

2021 article

Accessing the triplet manifold of naphthalene benzimidazole-phenanthroline in rhenium(I) bichromophores

Wells, K. A., Yarnell, J. E., Sheykhi, S., Palmer, J. R., Yonemoto, D. T., Joyce, R., … Castellano, F. N. (2021, August 11). DALTON TRANSACTIONS, Vol. 8.

By: K. Wells n, J. Yarnell n, S. Sheykhi n, J. Palmer  n, D. Yonemoto n, R. Joyce n, S. Garakyaraghi n, F. Castellano n 

TL;DR: The NBI-phen containing molecules exhibited enhanced visible light absorption with respect to their models and a rapid formation (<6 ns) of the triplet ligand-centred (LC) excited state of the organic ligand, N BI-phen. (via Semantic Scholar)
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Added: August 26, 2021

2021 article

Metal-Metal-to-Ligand Charge Transfer in Pt(II) Dimers Bridged by Pyridyl and Quinoline Thiols

Roy, S., Lopez, A. A., Yarnell, J. E., & Castellano, F. N. (2021, December 25). INORGANIC CHEMISTRY, Vol. 12.

By: S. Roy n, A. Lopez n, J. Yarnell n & F. Castellano n 

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Added: December 26, 2021

2021 journal article

Understanding the influence of geometric and electronic structure on the excited state dynamical and photoredox properties of perinone chromophores

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 23(42), 24200–24210.

By: K. Wells n, J. Palmer  n, J. Yarnell n, S. Garakyaraghi n, B. Pemberton  n, J. Favale n, M. Valchar n, A. Chakraborty n, F. Castellano n 

TL;DR: A series of eight similarly structured perinone chromophores were synthesized and photophysically characterized to elucidate the electronic and structural tunability of their excited state properties, including excited state redox potentials and fluorescence lifetimes/quantum yields, and will be valuable for future use in photofunctional applications. (via Semantic Scholar)
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Added: October 26, 2021

2020 journal article

A Robust Visible-Light-Harvesting Cyclometalated Ir(III) Diimine Sensitizer for Homogeneous Photocatalytic Hydrogen Production

ACS Applied Energy Materials, 3(2), 1842–1853.

By: M. Yang n, J. Yarnell n, K. El Roz n & F. Castellano n 

author keywords: solar fuels; photocatalysis; hydrogen production; electron transfer; iridium(III) photosensitizer; transient absorption spectroscopy
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Added: April 6, 2020

2020 journal article

Energy Migration Processes in Re(I) MLCT Complexes Featuring a Chromophoric Ancillary Ligand

Inorganic Chemistry, 59(12), 8259–8271.

By: K. Wells n, J. Yarnell n, J. Palmer  n, T. Lee  n, C. Papa n & F. Castellano n 

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Added: July 13, 2020

2020 journal article

Ligand-triplet migration in iridium(iii) cyclometalates featuring π-conjugated isocyanide ligands

Dalton Transactions, 49(29), 9995–10002.

By: J. Favale n, C. Hauke n , E. Danilov n , J. Yarnell n & F. Castellano n 

TL;DR: Variations in photophysical response are consistent with lowering the triplet ligand-centered (3LC) state of the arylisocyanide ligand as the π system was extended, confirmed by 77 K photoluminescence emission spectra and ultrafast transient absorption experiments. (via Semantic Scholar)
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Added: August 17, 2020

2020 journal article

Visible-Light-Driven Triplet Sensitization of Polycyclic Aromatic Hydrocarbons Using Thionated Perinones

The Journal of Physical Chemistry Letters, 11(13), 5092–5099.

By: J. Palmer  n, K. Wells n, J. Yarnell n, J. Favale n & F. Castellano n 

TL;DR: The combined results suggest a general strategy for accessing long-lived triplet excited states in organic chromophores featuring a lone C=O moiety resident within its structure, valuable for the design of metal-free triplet photosensitizers. (via Semantic Scholar)
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Added: July 27, 2020

2019 journal article

Excited-State Triplet Equilibria in a Series of Re(I)-Naphthalimide Bichromophores

The Journal of Physical Chemistry B, 123(35), 7611–7627.

By: J. Yarnell n, K. Wells n, J. Palmer  n, J. Breaux* & F. Castellano n 

TL;DR: The excited state processes of all molecules in this study were elucidated using a combination of transient absorption spectroscopy and time-resolved photoluminescence (PL) spectroscopic analysis, revealing the kinetics of the energy transfer processes occurring between the appended chromophores. (via Semantic Scholar)
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Added: September 30, 2019

2019 journal article

Photophysical Processes in Rhenium(I) Diiminetricarbonyl Arylisocyanides Featuring Three Interacting Triplet Excited States

Inorganic Chemistry, 58(13), 8750–8762.

By: J. Favale n, E. Danilov n , J. Yarnell n & F. Castellano n 

TL;DR: The combined experimental evidence, along with the aid of electronic structure calculations, illustrates that the CNAr ligand is actively engaged in manipulating the excited-state decay in three of these molecules, wherein the triplet metal-to-ligand charge-transfer (3MLCT) state along with two distinct triplet ligand-centered (3LC) excited- state configurations (phen and CNAr) conspire to produce the resultant photophysical properties. (via Semantic Scholar)
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Added: July 29, 2019

2018 journal article

Excited-State Processes of Cyclometalated Platinum(II) Charge-Transfer Dimers Bridged by Hydroxypyridines

Inorganic Chemistry, 57(3), 1298–1310.

By: A. Chakraborty n, J. Yarnell n, R. Sommer n , S. Roy n & F. Castellano n 

TL;DR: The combined data illustrate that entirely new classes of MMLCT chromophores can be envisioned using bridging pyridyl hydroxides in cooperation with various C^N cyclometalates to achieve photophysical properties suitable for excited-state electron- and energy-transfer chemistry. (via Semantic Scholar)
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Added: August 6, 2018

2018 journal article

Long-lived triplet excited state in a platinum(ii) perylene monoimide complex

DALTON TRANSACTIONS, 47(42), 15071–15081.

By: J. Yarnell n, A. Chakraborty n, M. Myahkostupov n, K. Wright  n & F. Castellano n 

TL;DR: The synthesis and solution based photophysical properties of a new Pt(ii)-terpyridine complex coupled to a perylene monoimide (PMI) chromophoric unit through an acetylene linkage resulted in quantitative quenching of the highly fluorescent PMI chromophore by introducing metal character into the lowest energy singlet state, thereby leading to the formation of a long-lived PMI-ligand localized triplet excited state. (via Semantic Scholar)
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Added: November 26, 2018

2016 journal article

Exposing the Excited-State Equilibrium in an Ir-III Bichromophore: A Combined Time Resolved Spectroscopy and Computational Study

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 2016(12), 1808–1818.

By: J. Yarnell n, C. McCusker n, A. Leeds*, J. Breaux* & F. Castellano n 

Contributors: J. Yarnell n, C. McCusker n, A. Leeds*, J. Breaux* & F. Castellano n 

author keywords: Iridium; Chromophores; Luminescence; Photophysics; Electronic structure; Density functional calculations; Triplet states; Transient absorption kinetics
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Added: August 6, 2018

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