MOLECULAR ARCHITECTURE VIA COORDINATION - SELF-ASSEMBLY, CHARACTERIZATION, AND HOST-GUEST CHEMISTRY OF MIXED, NEUTRAL-CHARGED, PT-PT AND PT-PD MACROCYCLIC TETRANUCLEAR COMPLEXES - X-RAY CRYSTAL-STRUCTURE OF CYCLOBIS[[CIS-PT(DPPP)(4-ETHYNYLPYRIDINE)(2)] [CIS-PD2-OSO2CF3]]((PET(3))(2)2)

Interaction of cis-Ptdppp(p-C6H4CN)(2) or cis-Ptdppp(p-C2C6H4N)(2) wit h cis-ML(2)(OSO2CF3)(2) (M = Pt Or Pd; L = PEt(3) or L(2) = dppp) in C H2Cl2 Or acetone, at room temperature, results in mixed, neutral-charg ed cyclic tetranuclear, Pt-Pt or Pt-Pd macrocyclic complexes in 90-99% yields via self-assembly. All tetramers are microcrystalline air- and water-stable solids with decomposition points > 170 OC. The benzonitr ile based macrocycles can be disassembled in solution with 4,4'-bipyri dine, while the 4-ethynylpyridine systems are more stable toward a var iety of guests. The 4-ethynylpyridine tetramers display host-guest che mistry with silver triflate via the ''pi-tweezer effect''. The X-ray c rystal structure as well as FABMS, including isotope patterns, are rep orted for the tetranuclear macrocycle pyridine)(2)][cis-Pd2+(PEt(3))(2 )2(-)OSO(2)CF(3)]] (14).