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

Abstract

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 μ 2 -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 bariumcontaining thin films.

Water-soluble chiral coordination polymers of Li+, Na+, K+, and Ba2+ with an anionic iron(iii) complex of a l-threonine derivative and a significant red shift of visible spectra with Al3+ salt

“…The Ba⋯Ba distance at 4.283 Å is on the higher side of the range 3.76–5.50 Å found in a few other structurally characterized complexes. 53–60 The higher coordination number of Ba 2+ is common. The coordination network is extended in three dimensions, with a one-dimensional channel formed along the c -axis.…”

Atomic Layer Deposition of CeO2 Film with a Novel Heteroleptic Ce(III) Complex

“…Recently, heteroleptic precursors have received more attention [43]. With heteroleptic precursors, the metal center was bonded with the best properties of different types of ligands to obtain potential precursors with high thermal stability, excellent volatility, and low melting points [44][45][46]. Cerium β-diketonates showed better volatility and thermal and moisture stability than complexes with alkoxides, cyclopentadienyls, amidinates, and guanidinates.…”