New volatile β-diketonate complexes of barium with sterically hindered methoxy-β-diketones as precursors for CVD

Игуменов, И. К.; Semyannikov, Pk. P.; Belaya, S. V.; Zanina, A. S.; Shergina, S. I.; Sokolov, I. E.

doi:10.1016/0277-5387(96)00176-3

Cited by 16 publications

(4 citation statements)

References 35 publications

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“…[22] The sharp peak at 250 cm Ϫ1 is due to a metal-oxygen vibration. [23] In the case of the spectra of the europium(III) compounds 1 and 2, additional peaks are present in the 1500Ϫ3000 cm Ϫ1 spectral region which are missing in the corresponding spectra of the gadolinium analogues. These features are assigned to electronic emission transitions from the 5 D 1 excited state to the 7 F J ground multiplet of europium(III), as they are not observed in the Raman spectrum of the isostructural gadolinium complex, and on the basis of the energy level structure of europium(III) ion, as already observed for different hosts.…”

Section: Raman Spectramentioning

confidence: 99%

Europium “Second Generation” Precursors for Metal-Organic Chemical Vapor Deposition: Characterization and Optical Spectroscopy

Malandrino¹,

Bettinelli²,

Speghini³

et al. 2001

Eur. J. Inorg. Chem.

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Section: Raman Spectramentioning

confidence: 99%

Europium “Second Generation” Precursors for Metal-Organic Chemical Vapor Deposition: Characterization and Optical Spectroscopy

Malandrino¹,

Bettinelli²,

Speghini³

et al. 2001

Eur. J. Inorg. Chem.

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“…Before the synthesis and characterization of transition metal complexes supported by AcSac, SacNac, and SacSac ligands, their counterparts, AcAc analogs, exhibited a low melting point and high stability in gas phase. [82][83][84] In 1961, Berg-Dowling reported that homoleptic iron complexes supported by AcAc ligands have a melting point of 86 °C. [85] Bauer et al found similar results for metal-f complexes.…”

Section: Chemical Vapor Deposition Process Using Complexes With Sulfu...mentioning

confidence: 99%

AcSac, SacSac, and SacNac, the Forgotten Sulfur‐Based Ligands and their Reactivity in the Formation of Main and Transition Metal Complexes

Rangel‐Garcia,

Rivas,

Serrano

et al. 2024

Eur J Inorg Chem

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AcAc (β‐acetylacetonate) are among the first ligands ever, to be studied. They all form stable complexes with most metals. During the 1960s, their sulfur derivatives were introduced; AcSac (β‐thioketonate), SacSac (β‐dithioketonate) and SacNac (β‐thioketoiminate). These derivatives were conferred contrasting reactivity, stereochemical, magnetic and spectral properties to their formed complexes. Later, sulfur‐ligands were at their pinnacle in the early 1970s, but their fall into disuse was due to the lack of methodologies for obtaining them and the lack of synthetic tools for their structural modification. As an effort to promote the study and application of these sulfur‐ligands; this review will address its history, the properties they bring to the metal centers and their potential applications.

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“…The introduction of bulky end-substituents into the ligand does not reduce the degree of oligomerization in the vapor phase, but increases the thermal stability of the compounds. 26 Numerous attempts to synthesize volatile barium compounds have been described. Complexation has been widely used as a means to obtain a second, more stable, generation of precursors.…”

Section: General Considerationsmentioning

confidence: 99%

Trends in precursor design for conventional and aerosol-assisted CVD of high-Tc superconductors

Hubert‐Pfalzgraf

Guillon

1998

Appl. Organometal. Chem.

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Conventional MOCVD techniques require molecules displaying volatility and constant vapor pressure. Metal oxide precursors, i.e., β‐diketonates, or classical or functionalized metal alkoxides are mostly solids. The various approaches used to tailor volatility are discussed with barium derivatives as an example. The relationships between sublimation temperature and molecular weight suggest that volatility can be optimized on the basis of molecular weight. Aerosol‐assisted CVD (AACVD) can use a larger range of precursors since volatility is no longer crucial. The solvent is an undesired ballast in a CVD process. High solubility of the precursors in the selected solvent is thus desirable. ‘Stability’ here includes the absence of precipitation which would change the stoichiometry of the feed solution for multicomponent oxides. Precipitation is often promoted by hydrolysis; stability toward moisture is thus desirable. The use of mixtures of precursors based on different ligands (β‐diketonates, β‐ketoesterates, alkoxides) can lead to ligand exchange reactions giving homometallic species, sometimes of low solubility, or mixed‐metal species by self‐assembly, thus improving solubility and stability toward moisture. These aspects are illustrated in compositions related to high‐Tc superconductors. Novel copper, yttrium, cerum(IV), barium‐copper, yttrium‐copper and praseodynium‐copper species are reported. © 1998 John Wiley & Sons, Ltd.

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New volatile β-diketonate complexes of barium with sterically hindered methoxy-β-diketones as precursors for CVD

Cited by 16 publications

References 35 publications

Europium “Second Generation” Precursors for Metal-Organic Chemical Vapor Deposition: Characterization and Optical Spectroscopy

Europium “Second Generation” Precursors for Metal-Organic Chemical Vapor Deposition: Characterization and Optical Spectroscopy

AcSac, SacSac, and SacNac, the Forgotten Sulfur‐Based Ligands and their Reactivity in the Formation of Main and Transition Metal Complexes

Trends in precursor design for conventional and aerosol-assisted CVD of high-Tc superconductors

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