VI(S), containing root-mean-squared amplitudes of thermal vibrations, anisotropic thermal parameters, and positional parameters for non-hydrogen atoms, respectively, and Figure 9(S) showing the pH dependence of the VIV/|H(2,3,4-TRENPAM) potential from pH 6 to 12 (5 pages); Table V(S) containing structure factor amplitudes (8 pages). Ordering information is given on any current masthead page.

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modynamics of the return electron transfer. An excellent correlation is observed in the present work presumably because, unlike previous work, the compounds studied are similar in structure and dimensions and do not undergo significant chemical reactions either within or outside the geminate radical pair and because accurate redox parameters were obtained.Molecular A-frame complexes* are one of the larger classes of bimetallic late-transition-metal complexes. While a large number of apex ligands have been incorporated, apex oxo, imido, and amido ligands are ~n k n o w n .~,~ The majority of A-frame complexes are based on the bis(dipheny1phosphino)methane (dppm) ligand and usually contain the metals Pt, Pd, Rh, or Ir.334a Since we are interested in preparing p-oxo and p-imido complexes of these metals as models for late-transition-metal surface oxides, we began working on expanding the A-frame class to include complexes with these apex ligands.' During this work we discovered the first examples of A-frame complexes containing a deprotonated dppm (bis(dipheny1phosphino)methanide or dppm-