621sphere shift is expected to be proportional to the effective magnetic moment, other things being equal.The apparent variation of Feff with temperature was incorporated in the data-fitting process and showed no significant change in the kinetic parameters for FeTMpyP, while for FeTPPS about a 30% change in k , was found. The data in the latter case do not define kl as well, due mainly to the faster rate of exchange which has less influence on the relaxationThe TZM results are interesting in that the lack of field dependence and the negative E, are not consistent with only the Bloembergen-Morgan modellg for electron-spin relaxation. We considered other possible relaxation mechanisms including of ~~1 7 0 . 1 1 nuclear quadrupole interaction and anisotropic g factors but could not draw any firm conclusions from the data at hand. In general, physically unrealistic parameters were required. This problem does not affect the kinetic conclusions seriously but deserves more study in its own right.Acknowledgment.
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