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Three chromium(III) 1,2,4-diazaphospholide complexes were prepared: 3,5-di- tert -butyl-1,2,4-diazaphospholide chromium(III) dichloride [( η  2 -3,5- t Bu 2 dp)Cr(THF) 2 Cl 2 ] ( 1 ), 3,5-di-phenyl-1,2,4-diazaphospholide chromium(III) dichloride [( η  2 -3,5-Ph 2 dp)Cr(THF) 2 Cl 2 ] ( 2 ), and 2,6-bis( N -1,2,4-diazaphosphol-1-yl)pyridine chromium(III) trichloride {[2,6-bis( N -1,2,4-diazaphosphol-1-yl)pyridine]CrCl 3 } ( 3 ). X-ray diffraction analysis has shown that these six-coordinate complexes each have a pseudo-octahedral configuration. Electron paramagnetic resonance (EPR) spectroscopy data for complex  1  for the paramagnetic  S  = 3/2 system ( d  3  electron configuration) confirm a Cr(III) center in the octahedral coordination environment. The magnetic susceptibility of complex  1  followed the Curie–Weiss law well between 25 and 300 K. The magnetic moment of  1  was found to be close to the spin-only magnetic moment expected for three unpaired electrons (3.87 μ B ).

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Chromium(III) complexes with 1,2,4-diazaphospholide and 2,6-bis( N -1,2,4-diazaphosphol-1-yl) pyridine ligands: synthesis, X-ray structural characterization, EPR spectroscopy analysis, and magnetic susceptibility studies