Reactions of the 1,3-diphosphete complex [Cp'''Co(η4-P2C2tBu2)] (Cp''' = Cp(tBu)3, 1) with Ag[Al{OC(CF3)3}4] (Ag[TEF]) and [LAu][TEF] (L = (THT)2, (THT)PPh3) were studied under various reaction conditions. Depending on the stoichiometry of the reactants, reaction time and temperature involved, a selective formation of the monomers, [{(Et2O)Ag}{Cp'''Co(µ,η4:η1:η1-P2C2tBu2)}][TEF] (4) and [Au{Cp'''Co(η4:η1-P2C2tBu2)}2][TEF] (6), the dimer [{(Et2O)Ag}2{Cp'''Co(µ,η4:η1:η1-P2C2tBu2)}]·2[TEF] (3), the trimers [Au3{Cp'''Co(η4:η1:η1-P2C2tBu2)}4]·3[TEF] (7) and [(η1-PPh3)2Au3{Cp'''Co(η4:η1:η1-P2C2tBu2)}2]·3[TEF] (8), and the one-dimensional polymer [Ag{Cp'''Co(η4:η1:η1-P2C2tBu2)}]n[TEF]n (2) was realized. DFT calculations provided additional insight into the formation of the polymeric species during the assembling process of 2, 3 and 4. All compounds were characterized in the solid state by X-ray crystallography and in solution by multinuclear NMR spectroscopy and mass spectrometry.