Three crystalline trinuclear gold(I) clusters, [Au(3)f(2)y] (1), [Au(3)fy(2).] (2), and [Au(3)y(3)] (3), where f = N,N'-bis(2,6-dirnethylphenyl)methanirnidamidate and y = dimethylendiphenylphosphinate, exhibit bridges from the N,N-formamidinate and/or from the ylide anion ligand whose P-methylene groups chelate in an unusual fashion, where the chelate CPC unit is perpendicular to the trigonal plane of the metal atoms. Assemblies 1 and 2 are the first gold(I) trinuclear clusters featuring mixed-ligand bridges from different N,N and C,C donors; 3 is a previously unknown homoleptic ylide anion cyclic trinuclear assembly. Formamidinate bridges in 1 and 2 connect gold(I) atoms at aurophilic distances of 3.084(2) and 3.0543(4) angstrom, whereas an out-of plane (perpendicular) P-ylide anion bite produces Au-I-Au-I distances of as large as 3.900(2) angstrom in 3. The crystal space groups for 1 and 2 are triclinic P (1) over bar and that for 3 is monoclinic P2(1)/c, with Z = 2 for 1 and 2 and Z = 4 for 3. Compounds are synthesized under Schlenk conditions at -20 degrees C in toluene by reacting the proper ratios of the gold(I) formamidinate [Au(2)f(2)] with the phosphorus ylide [Hy] under basic conditions (KOH), followed by extraction with ether. This synthesis also produces a dinuclear cation, [Au(2)f(Hy)(2)](+), previously reported by our group. A neutral mixed-ligand dinuclear complex, [Au(2)fy], was not observed. Under UV light, 1 and 2 display a bright-green luminescence at room temperature and in frozen methyltetrahydrofuran solutions under liquid nitrogen, with microsecond lifetimes. All three complexes 1-3 are, characterized by their X-ray crystal structures, H-1 NMR, IR, UV visible, and luminescence spectroscopies, and elemental analysis.