Heterodinuclear platinum (or palladium) complexes having a terminal carbene, (Ph3P)Cl(Me-2-NHC)M-M'L'(n) (M = Pt: M'L'(n) = Co(CO)(4) (1), Mn(CO)(5) (2), MoCP(CO)(3) (3), FeCp(CO)(2) (4) M = Pd: M'L'(n) = Co(CO)(4) (33), Mn(CO)(5) (34)) and (L)Cl{[(PhCH2)YC}Pt-M'L'(n)(M'L'(n)=Co(CO)(4), L = PMe2Ph: Y = NPh2 (5), OEt (6), OMe (7), O'Pr (8); M'L'(n) = Co(CO)(4), L = PPh3: Y = OEt (9); M'L'(n) = Mn(CO)(5), L = PMe2Ph: Y = OEt (10)), are synthesized by metathesis reactions of dichlorocarbene complexes with metalate Na+[M'L'(n)](-). These complexes are characterized by NMR and IR spectroscopies and elemental analysis, and the molecular structures of 1, 2, and 6 are determined by X-ray structure analysis. Deprotonation of 6-10 with base gives heterodinuclear mu-alkoxystyrylplatinum-metal complexes, (L(CO){mu-PhHC=YC}Pt-M'L'(n-1) = (M'L'(n-1) = Co(CO)(3), L = PMe2Ph: Y = OEt (13), OMe (14), O'Pr(15) M'L'(n-1) = Co(CO)(3), L = PPh3: Y = OEt (16); M'L'(n-1) = Mn(CO)(4,) L = PMe2Ph: Y = OEt (12)), where the E isomer is thermodynamically stable. Z isomers of corresponding monomeric alkoxystyrylplatinum(II) complexes are found to be more stable than the corresponding E isomers. In contrast, both the dinuclear diphenylaminostyrylplatinum-cobalt complex and its mononuclcar analogue favor the Z configuration.