Výsledky vyhledávání - "Daniel E. Stasiw"

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

Autor: Martin L. Kirk, David A. Shultz, Ju Chen, Patrick Hewitt, Daniel E. Stasiw, Art van der Est

Publikováno v: Chemical Science

A change in the sign of the ground-state electron spin polarization (ESP) is reported in complexes where an organic radical (nitronylnitroxide, NN) is covalently attached to a donor–acceptor chromophore via two different meta-phenylene bridges in (

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::668349dabf3646d4ecb29659e32e8ae4
http://europepmc.org/articles/PMC8549796

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Isomerization of Linear to Hyperbranched Polymers: Two Isomeric Lactones Converge via Metastable Isostructural Polyesters to a Highly Branched Analogue

Autor: Grant W. Fahnhorst, William B. Tolman, Daniel E. Stasiw, Thomas R. Hoye

Publikováno v: ACS macro letters. 7(10)

We report here the Zn(II)-catalyzed convergence of two metastable and isostructural polyesters to an isomeric polymer having a hyperbranched architecture. Ring-opening transesterification polymerization (ROTEP) of 4-carbomethoxyvalerolactone (CMVL) u

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::778a3100ba29b4af92052c04ccda44a4
https://pubmed.ncbi.nlm.nih.gov/35651265

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Spectroscopic Signatures of Resonance Inhibition Reveal Differences in Donor-Bridge and Bridge-Acceptor Couplings

Autor: Martin L. Kirk, Guangbin Wang, Roger D. Sommer, Jing Yang, Jinyuan Zhang, Daniel E. Stasiw, Diana Habel-Rodriguez, Benjamin W. Stein, David A. Shultz

Publikováno v: Journal of the American Chemical Society. 142(10)

The torsional dependence of the ground state magnetic exchange coupling (J) and the corresponding electronic coupling matrix element (HDA) for eight transition metal complexes possessing donor-acceptor (D-A) biradical ligands is presented. These bira

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::351ed3eb8f15ed13d933874e1a533421
https://pubmed.ncbi.nlm.nih.gov/32069027

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Mechanism of the Polymerization of rac-Lactide by Fast Zinc Alkoxide Catalysts

Autor: Christopher J. Cramer, Benjamin D. Neisen, Mukunda Mandal, Aaron B. League, Moshe Kol, Tomer Rosen, Anna M. Luke, William B. Tolman, Daniel E. Stasiw

Publikováno v: Inorganic Chemistry. 56:14366-14372

The ring-opening transesterification polymerization (ROTEP) of rac-lactide (rac-LA) using LXZn catalysts (LX = ligand having phenolate, amine, and pyridine donors with variable para substituents X on the bound phenolate donor; X = NO2, Br, t-Bu, OMe)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a6ea11294ca493f0ca335a40c5bae04d
https://doi.org/10.1021/acs.inorgchem.7b02544

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Why So Slow? Mechanistic Insights from Studies of a Poor Catalyst for Polymerization of ε-Caprolactone

Autor: William B. Tolman, Christopher J. Cramer, Daniel E. Stasiw, Benjamin D. Neisen, Mukunda Mandal, Lauren A. Mitchell

Publikováno v: Inorganic chemistry. 56(2)

Polymerization of e-caprolactone (CL) using an aluminum alkoxide catalyst (1) designed to prevent unproductive trans binding was monitored at 110 °C in toluene-d8 by 1H NMR and the concentration versus time data fit to a first-order rate expression.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0ca30ca25e8ad46186a14a088add9094
https://pubmed.ncbi.nlm.nih.gov/28005338

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Superexchange Contributions to Distance Dependence of Electron Transfer/Transport: Exchange and Electronic Coupling in Oligo(para-Phenylene)- and Oligo(2,5-Thiophene)-Bridged Donor–Bridge–Acceptor Biradical Complexes

Autor: Daniel E. Stasiw, Candice L. Brannen, Paul D. Boyle, David A. Shultz, Roger D. Sommer, Geoffrey F. Lewis, Guangbin Wang, Martin L. Kirk

Publikováno v: Journal of the American Chemical Society. 135:17144-17154

The preparation and characterization of three new donor-bridge-acceptor biradical complexes are described. Using variable-temperature magnetic susceptibility, EPR hyperfine coupling constants, and the results of X-ray crystal structures, we evaluate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a811e666fbb06e13f03e059e8629158f
https://doi.org/10.1021/ja4081887

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Electronic and Exchange Coupling in a Cross-Conjugated D–B–A Biradical: Mechanistic Implications for Quantum Interference Effects

Autor: Daniel E. Stasiw, David A. Shultz, Diana Habel-Rodriguez, Benjamin W. Stein, Martin L. Kirk, Paul D. Boyle

Publikováno v: Journal of the American Chemical Society. 135:14713-14725

A combination of variable-temperature EPR spectroscopy, electronic absorption spectroscopy, and magnetic susceptibility measurements have been performed on Tp(Cum,Me)Zn(SQ-m-Ph-NN) (1-meta) a donor-bridge-acceptor (D-B-A) biradical that possesses a c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5359a0f468dab125de0ca1e30cec241
https://doi.org/10.1021/ja405354x

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Towards controlling the solid state valence tautomeric interconversion character by solvation

Autor: Carlos B. Pinheiro, Marcos A. Ribeiro, Daniel E. Stasiw, Philip Pattison, David A. Shultz, Paul R. Raithby

Publikováno v: Ribeiro, M A, Stasiw, D E, Pattison, P, Raithby, P R, Shultz, D A & Pinheiro, C B 2016, ' Towards controlling the solid state valence tautomeric interconversion character by solvation ', Crystal Growth and Design, vol. 16, no. 4, cg-2016-00159e.R1, pp. 2385-2393 . https://doi.org/10.1021/acs.cgd.6b00159

Crystals of [Co(diox)2(4-NO2-py)2] (1) and [Co(diox)2(4-CN-py)2] (2) where diox are the o-dioxolene 3,5-di-tbutylsemiquinonate(SQ•-) and/or 3,5-di-t-butylcatecholate (Cat2-) ions, 4-NO2-py is 4-nitro-pyridine, 4-CN-py is 4-cyano-pyridine,are among

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f4e4429f0ff7067b04cd7fe9253651d
https://purehost.bath.ac.uk/ws/files/142754022/CODiox2py_prr_final_author_copy.pdf

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Determining the Conformational Landscape of σ and π Coupling Using para-Phenylene and 'Aviram-Ratner' Bridges

Autor: Martin L. Kirk, Roger D. Sommer, Daniel E. Stasiw, David A. Shultz, Benjamin W. Stein, Lukasz Wojtas, Jinyuan Zhang, Ranjana Dangi, Guangbin Wang

Publikováno v: Journal of the American Chemical Society. 137(29)

The torsional dependence of donor-bridge-acceptor (D-B-A) electronic coupling matrix elements (H(DA), determined from the magnetic exchange coupling, J) involving a spin SD = 1/2 metal semiquinone (Zn-SQ) donor and a spin S(A) = 1/2 nitronylnitroxide

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::713510c2ed54049f6614f9dc21f36c04
https://pubmed.ncbi.nlm.nih.gov/26153657

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