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- W4240172034 abstract "<div> <p>The large paramagnetic shifts and short relaxation times resulting from the presence of a paramagnetic centre complicate NMR data acquisition and interpretation in solution. In contrast to the large number of standard NMR methods for diamagnetic compounds, the number of paramagnetic NMR methods is limited and spectral assignment often relies on theoretical models. We report a toolbox of 1D (<sup>1</sup>H, proton-coupled <sup>13</sup>C, selective <sup>1</sup>H‑decoupling <sup>13</sup>C, steady-state NOE) and 2D (COSY, NOESY, HMQC) paramagnetic NMR methods for the straightforward structural characterisation of paramagnetic complexes in solution and demonstrate its general applicability for fields from coordination chemistry to spin‑crossover complexes and supramolecular chemistry through the characterisation of Co<sup>II</sup> and high-spin Fe<sup>II</sup> mononuclear complexes as well as a Co<sub>4</sub>L<sub>6</sub> cage. The toolbox takes advantage of the reduced signal overlap, decreased instrument time and greater sensitivity from the presence of the paramagnetic centre while overcoming the loss of structural information from the wide chemical shift dispersion and broad signals. In some circumstances, more structural information was revealed in the COSY spectra than would be observable for a diamagnetic analogue; as well as the expected through-bond cross-peaks, through-space and exchange cross-peaks were also observed for mononuclear complexes with multiple ligand environments and fast ligand exchange. With this toolbox, the standard characterisation of paramagnetic complexes and cages is now possible using NMR spectroscopic methods. </p> </div> <br>" @default.
- W4240172034 created "2022-05-12" @default.
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- W4240172034 date "2020-04-09" @default.
- W4240172034 modified "2023-09-27" @default.
- W4240172034 title "A Paramagnetic NMR Spectroscopy Toolbox for the Characterisation of Paramagnetic/Spin-Crossover Coordination Complexes and Metal-Organic Cages" @default.
- W4240172034 doi "https://doi.org/10.26434/chemrxiv.12098670" @default.
- W4240172034 hasPublicationYear "2020" @default.
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