Chromium(III)-pyrazole complexes. X-Ray crystal structures, 1H NMR investigation of ligand fluxional behavior and EPR studies

Jessica M López Plá,Athanassios K Boudalis,Joshua Telser,Raphael G Raptis

doi:10.1016/j.ica.2019.119299

Chromium(III)-pyrazole complexes. X-Ray crystal structures, 1H NMR investigation of ligand fluxional behavior and EPR studies

Jessica M López Plá, Athanassios K Boudalis + Show 2 more

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https://doi.org/10.1016/j.ica.2019.119299

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Journal: Inorganica Chimica Acta	Publication Date: Dec 5, 2019
Citations: 5	License type: publisher-specific-oa

Affiliation: Roosevelt University, Florida International University, University of Strasbourg, Institut de Chimie

#Mononuclear Chromium #Q-band EPR + Show 8 more

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Abstract

Mononuclear chromium(III) complexes of formula mer-[CrIIICl3(pz*H)3] (pz*H = pyrazole (pzH), and substituted pyrazoles: 3-Me-pzH, 4-Me-pzH, 4-Cl-pzH, 4-Br-pzH, 4-I-pzH) and trans-[CrIIICl2(pzH)4]Cl were synthesized from reactions of CrCl3 hydrate and pyrazole ligands and crystallographically characterized. The fluxional behavior of the complexes, attributed to pyrazole tautomerization, was probed by variable temperature 1H NMR spectra in the −50 °C to +23 °C range and activation parameters were derived. Q-band EPR were recorded and analyzed for mer-[CrIIICl3(pz*H)3] (R = H, Me, Cl) showing satellite features corresponding to weak zero-field splitting (zfs).

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