Novel Volatile Heteroleptic Barium Complexes Using Tetradentate Ligand and β‑Diketonato Ligand

Novel barium heteroleptic complexes were synthesized through the substitution of the bis­(trimethylsilyl)­amide of Ba­(btsa)2·2DME with aminoalkoxide and β-diketonate ligands. Compounds [Ba­(ddemap)­(tmhd)]2 (1) and [Ba­(ddemmp)­(tmhd)]2 (2) were obtained and analyzed through Fourier transform infrared spectroscopy, nuclear magnetic resonance, thermogravimetric analysis, and elemental analysis (ddemapH = 1-(dimethylamino)-5-((2-(dimethylamino)­ethyl) (methyl)­amino)­pentan-3-ol and ddemmpH = 1-(dimethylamino)-5-((2-(dimethylamino)­ethyl) (methyl)­amino)-3-methylpentan-3-ol). In single-crystal X-ray crystallography, complex 1 exhibited a dimeric structure with μ2-O bonds of the ddemap ligand. All complexes exhibited high volatility and could be sublimed under reduced pressure (0.5 Torr) at 160 °C, indicating that these complexes are promising candidates as atomic layer deposition or chemical vapor deposition precursors for the growth of barium-containing thin films.