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Updated: Jun 7, 2025

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Pyrazolate-supported Cr3(μ3-O) cores; homovalent CrIII3 and mixed-valent CrIII2CrIV
Jessica M López-Plá1, Mohammed Obies2,3, Georgia Zahariou4
1Department of Chemistry and Biochemistry Florida International University, 11200 SW 8th St., Miami, FL, 33199-0001, USA. rraptis@fiu.edu.
Abstract:
The thermally assisted reaction of Cr(NO3)3·9H2O, 4-Cl-pzH, and Et3N yielded electrochemically active trinuclear CrIII-oxo-pyrazolate complexes with formula (Ph4P)2[Cr3(μ3-O)(μ-4-Cl-pz)6X3], X = Cl (1) and Br (2). Magnetic susceptibility measurements and EPR spectroscopy show that 1 has an antiferromagnetically coupled Cr3O-core with an S = 1/2 ground state and isotropic exchange of J = -12.7 cm-1. (Hex = -2JS1S2). Cyclic voltammetry reveals a facile reversible oxidation to the formally CrIII2CrIV analogue of 1. The UV-Vis-NIR spectra of CrIII3 and CrIII2CrIV species have been assigned with the help of DFT calculations.
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