When 3-ethynyl-1,10-phenanthroline (HC Cphen) or 3,8-diethynyl-1,10-phenanthroline (HC CphenC CH) is utilized as a bifunctional bridging ligand via stepwise molecular fabrication, a series of Pt-Ru and Pt-Re heteronuclear complexes composed of both platinum(II) terpyridyl acetylicle chromophores and a Ru(phen)(bPY)(2)/Re(phen)(CO)(3)Cl subunit were prepared by complexation of one or two Pt((t)BU(3)tpy)(2+) units to the mononuclear Ru-II or Re-I precursor through platinum acetylicle a coordination. These Pt-Ru and Pt-Re complexes exhibit intense low-energy absorptions originating from both Pt- and Ru (Re)-based metal-to-ligand charge-transfer (MLCT) states in the near-visible region. They are strongly luminescent in both solid states and fluid solutions with a submicrosecond range of lifetimes and 0.27-6.58% of quantum yields in degassed acetonitrile. For the Pt-Ru heteronuclear complexes, effective intercomponent Pt -> Ru energy transfer takes place from the platinum(II) terpyridyl acetylicle chromophores to the ruthenium(II) tris(diimine)-based emitters. In contrast, dual emission from both Pt-and Re-based (MLCT)-M-3 excited states occurs because of less efficient intercomponent Pt -> Re energy transfer in the Pt-Re heteronuclear complexes.