Organoerdmetallkomplexe von d-block-elementen. IV. "Ein-topf-synthese" flüchtiger organogalliocobalt-komplexe, molekülstruktur von {μ-[3-(Diethylamino)propyl]gallio}[bis(tetracarbonylcobalt)]

Carefully purified starting materials and precisely controlled stoichiometries guarantee high yield "one pot synthesis" of the novel volatile organogalliocobalt complexes 2-7. These compounds are stabilized by intramolecular adduct formation at the gallium center. Synthesized compounds are identified by ¹H, ¹³C, ³¹P-NMR, infrared ν(CO) and MS data. A single crystal X-ray analysis of {μ-[3-(diethylamino)propyl]gallio}[bis(tetracarbonylcobalt)] reveals cobalt-gallium bond distances averaging to 254.3 pm. Thermal decarbonylation of 2-4 in the presence of phosphines, e.g. P(C₆H₅)₃, yields quantitatively the trans-phosphine substituted complexes 5-7. In polar solvents those latter compounds exhibit a significantly weakened tendency towards heterolytic dissociation of the metal-metal bond. This behavior reflects a strengthened cobalt-gallium interaction, as it is also indicated by mass spectroscopy.