Mononuclear chromium(III) complexes of formula mer-[Cr III Cl 3 (pz*H) 3 ] (pz*H = pyrazole; pzH, 3-Me-pzH, 4-Me-pzH, 4-Cl-pzH, 4-Br-pzH, 4-I-pzH) and trans-[Cr III Cl 2 (pzH) 4 ]Cl were synthesized from reactions of CrCl 3 hydrate and pyrazole ligands and crystallographically characterized. The fluxional behaviour of the complexes, attributed to pyrazole tautomerization, was probed by variable temperature 1 H NMR spectra in the-50 °C to +23 °C range and activation parameters were derived. Q-band EPR were recorded and analyzed for mer-[Cr III Cl 3 (pz*H) 3 ] (R= H, Me, Cl) showing satellite features corresponding to weak ZFS.
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