The paramagnetic resonance absorptions in several trichelate complexes of Cr+3have been investigated at room temperature and at 1.2hyphen; and 3.0hyphen;cm wavelengths. From single crystal measurements on chromic acetylacetonate the orientations of the electric axes were determined and the parameters in the spinhyphen;Hamiltonian found to beg= 1.983plusmn;0.002, verbar;Dverbar; = 0.592plusmn;0.002 cmmdash;1, and verbar;Everbar; = 0.052plusmn;0.002 cmmdash;1. The asymmetric single absorption peak withg= 4 found in several of the powders and in their liquid solutions is explained on the basis of the relatively large value ofDassociated with the individual trichelate molecules. The apparent inadequacy of the ``ionic'' model for several chromic compounds is also discussed.
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