Jump to main content
Jump to site search


Ligand control of low-frequency electron paramagnetic resonance linewidth in Cr(iii) complexes

Author affiliations

Abstract

Understanding how the ligand shell controls low-frequency electron paramagnetic resonance (EPR) spectroscopic properties of metal ions is essential if they are to be used in EPR-based bioimaging schemes. In this work, we probe how specific variations in the ligand structure impact L-band (ca. 1.3 GHz) EPR spectroscopic linewidths in the trichloride salts of five Cr(III) complexes: [Cr(RR-dphen)3]3+ (RR-dphen = (1R,2R)-(+)-diphenylethylenediamine, 1), [Cr(en)3]3+ (en = ethylenediamine, 2), [Cr(me-en)3]3+ (me-en = 1,2-diaminopropane, 3), [Cr(tn)3]3+ (tn = 1,3-diaminopropane, 4) [Cr(trans-chxn)3]3+ (trans-chxn = trans-(±)-1,2-diaminocyclohexane, 5). Spectral broadening varies in a nonintuitive manner across the series, showing the sharpest peaks for 1 and broadest for 5. Molecular dynamics simulations provide evidence that the broadening is correlated to rigidity in the inner coordination sphere and reflected in ligand-dependent distribution of Cr–N bond distances that can be found in frozen solution.

Graphical abstract: Ligand control of low-frequency electron paramagnetic resonance linewidth in Cr(iii) complexes

Back to tab navigation

Supplementary files

Article information


Submitted
07 Jan 2021
Accepted
25 Mar 2021
First published
25 Mar 2021

Dalton Trans., 2021, Advance Article
Article type
Paper

Ligand control of low-frequency electron paramagnetic resonance linewidth in Cr(III) complexes

A. J. Campanella, M. Nguyen, J. Zhang, T. Ngendahimana, W. E. Antholine, G. R. Eaton, S. S. Eaton, V. Glezakou and J. M. Zadrozny, Dalton Trans., 2021, Advance Article , DOI: 10.1039/D1DT00066G

Social activity

Search articles by author

Spotlight

Advertisements