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strong interaction takes place only in the b2 orbital.the occupation of these MO's should weaken the metal-ligand bonds. The lower three orbitals are predominantly of dx2 character and are antibonding for in-plane ligands, and only the highest one is of dz2 character and antibonding for out-of-plane ligands. The out-of-plane ligands are therefore more tightly bound to each metal ion than the in-plane ligands. The overlap population for the out-of-plane Pt-O bond in 3 was found to be larger than that for the in-plane Pt-O bond.14These MO results indicating that the out-of-plane Pt-O bond is stronger than the in-plane bond are consistent with the observed regioselective ligand substitution as well as with the observed Pt-O distances.1,2Acknowledgment. This work was supported by a Grant-in-Aid for Scientific Research (No. 63612503) on the Priority Area of Dynamic Interactions and Electronic Processes of Macromolecular Complexes and a Grant-in-Aid for Scientific Research (No. 01430009) from the Ministry of Education, Science and Culture, Japan. We are grateful to Dr. M. Ebihara of the Institute for Molecular Science for the X-ray analysis.

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