Highhyphen;field and zerohyphen;field electron paramagnetic resonance spectra of polycrystalline lsqb;Cr diamsarrsqb;Cl3sdot;H2O, lsqb;Cr diamsar H2rsqb;Cl5sdot;xH2O, and 1percnt; Cr/raclsqb;Co diamsar H2rsqb;Cl5sdot;1.5H2O were recorded (diamsarequiv;1,8hyphen;diaminohyphen;3,6,10,13,16,19hyphen;hexaazabicyclo lsqb;6.6.6rsqb; eicosane). Combining the highhyphen; and zerohyphen;field spectra made determination of the spinhyphen;Hamiltonian parameters from powder spectra an easy matter, even with two sites in the cobalt host case. Full matrix refined parameters are given, but an iterative perturbation method was used with the actual fieldBrather than the central field,B0=hngr;/gmgr;B, to get accurate parameters. Corrected perturbation formulas are given. For a rigid cage ligand like diamsar, there is considerable variation in the spinhyphen;Hamiltonian parameterDand evidence that the principal axis of the corresponding interactions does not necessarily lie close to the ligandrsquo;s threefold axis.
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