ArticleDalton transactions (Cambridge, England : 2003)2020
EXAFS investigations of temperature-dependent structure in cobalt-59 molecular NMR thermometers.
Article in Dalton transactions (Cambridge, England : 2003), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- Quantum Mimicry With Inorganic Chemistry.Comments on modern chemistry. Part A, Comments on inorganic chemistry : a journal of critical discussion of the current literature · 2024Article
- Isotopomeric Elucidation of the Mechanism of Temperature Sensitivity inInorganic chemistry · 2022Article
- Ligand control of low-frequency electron paramagnetic resonance linewidth in Cr(III) complexes.Dalton transactions (Cambridge, England : 2003) · 2021Article
- Ligand Control ofMagnetochemistry (Basel, Switzerland) · 2020Article
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5 authors.
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Abstract
Cobalt-59 nuclei are known for extremely thermally sensitive chemical shifts (δ), which in the long term could yield novel magnetic resonance thermometers for bioimaging applications. In this manuscript, we apply extended X-ray absorption fine structure (EXAFS) spectroscopy for the first time to probe the exact variations in physical structure that produce the exceptional thermal sensitivity of the 59Co NMR chemical shift. We apply this spectroscopic technique to five Co(iii) complexes: [Co(NH3)6]Cl3 (1), [Co(en)3]Cl3 (2) (en = ethylenediamine), [Co(tn)3]Cl3 (3) (tn = trimethylenediamine), [Co(tame)2]Cl3 (4) (tame = 1,1,1-tris(aminomethyl)ethane), and [Co(diNOsar)]Cl3 (5) (diNOsar = dinitrosarcophagine). The solution-phase EXAFS data reveal increasing Co-N bond distances for these aqueous complexes over a ∼50 °C temperature window, expanding by Δr(Co-N) = 0.0256(6) Å, 0.0020(5) Å, 0.0084(5) Å, 0.0006(5) Å, and 0.0075(6) Å for 1-5, respectively. Computational analyses of the structural changes reveal that increased connectivity between the donor atoms encourages complex structural variations. These results imply that rich temperature-dependent structural variations define 59Co NMR thermometry in macrocyclic complexes.
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