SYNTHESIS, STRUCTURE, AND PROPERTIES OF GALLIUM COMPOUNDS WITH THE HETERODIFUNCTIONAL [2-(N,N-DIMETHYLAMINO)ETHYL]CYCLOPENTADIENYL LIGAND

Several new gallium compounds containing the [2-(N,N-dimethylamino)eth yl]cyclopentadienyl ligand (Cp(N)) are described. Reaction of the resp ective element halide with Cp(N)K 1 leads to the compounds 2-6 of the type [2-(Me(2)NCH(2)CH(2))C5H4]GaX(2) [2: X = Cl; 3: X = Br; 4: X = I; 5: X = CH3; 6: X = H]. Each compound was characterized by H-1 and C-1 3 NMR spectroscopy, mass spectrometry, and elemental analysis; the mol ecular structures of 2-5 were determined by X-ray crystallography. In the solid state and presumably also in solution all compounds feature a monomeric structure with an intramolecularly coordinated dimethylami no group. The resulting coordinative and electronic saturation of the metal center leads to a drastically decreased reactivity against moist ure and air. The observed dynamic behavior in solution is based on fas t haptotropic shifts in a ''windscreen-wiper'' type process. Sufficien t volatility and well-behaved fragmentation makes 6 a suitable precurs or for the deposition of gallium in the MOCVD process.