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The title Compounds (I)‐(IV) are prepared by reaction of Cu(II) perchlorate hexahydrate or Cu(II) acetate in aqueous solution with the triazacyclononane and sodium azide.

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reaction coordinate. The rate of the spin-change reaction has in all cases which have been investigated found to be of the order of magnitude of 101 23456-107 s"1, so the rate of the racemization reaction will not be restricted by any spin-change bottleneck.Acknowledgment. We are grateful for support from the Na-tional Institutes of Health (Grant HL 13652).Supplementary Material Available: Listings of thermal parameters, hydrogen atom positions, and bond distances and angles for [Fe-(tptcn)](C104)2 and Figure 4, a stereoview of the unit cell (4 pages).Ordering information is given on any current masthead page.