Chromium(III) acetylacetonate

Chromium(III) acetylacetonate is the coordination compound with the formula Cr(C5H7O2)3, sometimes designated as Cr(acac)3. This purplish coordination complex is used in NMR spectroscopy as a relaxation agent because of its solubility in nonpolar organic solvents and its paramagnetism. Chromium(III) acetylacetonate is the coordination compound with the formula Cr(C5H7O2)3, sometimes designated as Cr(acac)3. This purplish coordination complex is used in NMR spectroscopy as a relaxation agent because of its solubility in nonpolar organic solvents and its paramagnetism. The compound is prepared by the reaction of chromium(III) oxide with acetylacetone (Hacac): The complex has idealized D3 symmetry. The Cr-O distances are 1.93 Å. The complex has been resolved into individual enantiomers by separation of its adduct with dibenzoyltartrate.