Strontium β-diketonate complexes with polyamine donor ligands: the synthesis and structural characterization of [Sr(thd)2(L)]n (n=2; L=diethylenetriamine, n=1; L=triethylenetetramine, tetraethylenepentamine and tris(2-aminoethyl)amine) complex

Park, Jung‐Woo; Kim, Jun Tae; Koo, Sang Man; Kim, Chang Gyun; Kim, Yun Su

doi:10.1016/s0277-5387(00)00555-6

Cited by 19 publications

(6 citation statements)

References 23 publications

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“…In complex 3 , the Sr–O (tfac oxygen) lengths were in the range of 2.477–2.545 Å (average 2.5132 Å), which are comparable to those of [Sr(thd) 2 (triethylenetetramine)] (2.513 Å) and slightly shorter than those of [Sr(thd) 2 (tetraethylenepentamine)] (2.546 Å) (Table ). The average O–Sr–O chelate angle between the metal and tmgeH ligand is 62.9°, which is smaller than the N–Sr–N chelate angles of [Sr(thd) 2 (triethylenetetramine)] (63.1(4)–64.6 (3)°) and [Sr(thd) 2 (tetraethylenepentamine)] (61.5(4)–64.0 (3)°) …”

Section: Results and Discussionmentioning

confidence: 81%

“…The average O−Sr−O chelate angle between the metal and tmgeH ligand is 62.9°, which is smaller than the N− . 37 Complexes 8 and 9 showed a monomeric structure, where strontium ions are bonded to two tmhd or hfac ligands and coordinated to one todH ligand, which was obtained from the proton of the tmhdH or hfacH ligand. The crystal structure of 9 showed a nonacoordinate metal center and tricapped trigonal prismatic geometry, whereas 8 showed a bicapped trigonal prismatic structure with an octa-coordination metal center and hydrogen bonding between the oxygen atom (O9) of todH and the oxygen atom (O2) of tmhd (bond length = 2.807 Å).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The average O–Sr–O chelate angle between the metal and tmgeH ligand is 62.9°, which is smaller than the N–Sr–N chelate angles of [Sr(thd) 2 (triethylenetetramine)] (63.1(4)–64.6 (3)°) and [Sr(thd) 2 (tetraethylenepentamine)] (61.5(4)–64.0 (3)°). 37 …”

Section: Results and Discussionmentioning

confidence: 99%

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Synthesis of Mononuclear Strontium Complexes with Polyether and β-Diketonato Ligands

et al. 2023

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Strontium β-diketonate complexes were synthesized by the substitution reaction of the bis(trimethylsilyl) amide of Sr(btsa) 2 •2DME with an ethereal group and β-diketonate ligands. The compounds [Sr(tmge)(btsa)] 2 (1), [Sr(tod)(btsa)] 2 (2), Sr(tmgeH)(tfac) 2 (3), Sr(tmgeH)(acac) 2 (4), Sr(tmgeH)(tmhd) 2 (5), Sr(todH)(tfac) 2 (6), Sr(todH)(acac) 2 (7), Sr(todH)(tmhd) 2 (8), Sr(todH)(hfac) 2 (9), Sr(dmts)(hfac) 2 ( 10), [Sr(mee)-(tmhd) 2 ] 2 (11), and Sr(dts)(hfac) 2 •DME (12) were obtained and analyzed by various techniques, including FT-IR, NMR, TGA (thermogravimetric analyses), and elemental analysis. Complexes 1, 3, 8, 9, 10, 11, and 12 were further structurally confirmed by single-crystal X-ray crystallography, where complexes 1 and 11 showed dimeric structures with μ 2 -O bonds of ethereal groups or tmhd ligands, and complexes 3, 8, 9, 10, and 12 displayed monomeric structures. Interestingly, compounds 10 and 12, which preceded trimethylsilylation of the coordinating ethereal alcohols such as tmhgeH and meeH in the presence of HMDS as byproducts due to highly increasing acidity of them, originated from electron-withdrawing two hfac ligands.

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Section: Results and Discussionmentioning

confidence: 81%

Section: ■ Results and Discussionmentioning

confidence: 99%

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Synthesis of Mononuclear Strontium Complexes with Polyether and β-Diketonato Ligands

et al. 2023

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“…Subsequently, the same deposition run was performed, again with an atomic concentration ratio of La/Sr = 1:1. The corresponding XRD pattern of the film verifies the occurrence of both La and Sr 39 containing phases, see Figure 1d (red curve), which indicates that both precursors La(tmhd) 3 and Sr(tmhd) 2 were successfully transferred into the gas phase of the reactor chamber. However, it should be pointed out that the peak intensities of the La(OH) 3 phase are low for both depositions with and without extra tetraglyme (Figure 1d).…”

Section: ■ Experimental Sectionmentioning

confidence: 97%

“…(d) HRXRD patterns of thin films grown on (100) SrTiO 3 substrates by vaporizing Sr(tmhd) 2 -tetraglyme and La(tmhd) 3 dissolved together in dry toluene in the same precursor container.Depositions were performed without extra tetraglyme (black curve) and with extra tetraglyme (red curve). The observed reflection peaks are attributed to La(OH) 3 (black diamonds),38 SrO (red diamonds), and SrCO 3 (green diamonds) 39.…”

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confidence: 99%

Potential of La-Doped SrTiO₃ Thin Films Grown by Metal–Organic Vapor Phase Epitaxy for Thermoelectric Applications

Baki

Abdeldayem

Morales

et al. 2023

Crystal Growth & Design

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La-doped SrTiO 3 thin films with high structural quality were homoepitaxially grown by the metal−organic vapor phase epitaxy (MOVPE) technique. Thermogravimetric characterization of the metal−organic precursors determines suitable flash evaporator temperatures for transferring the liquid source materials in the gas phase of the reactor chamber. An adjustment of the charge carrier concentration in the films, which is necessary for optimizing the thermoelectric power factor, was performed by introducing a defined amount of the metal−organic compound La(tmhd) 3 and tetraglyme to the liquid precursor solution. X-ray diffraction and atomic force microscopy verified the occurrence of the pure perovskite phase exhibiting a high structural quality for all La concentrations. The electrical conductivity of the films obtained from Hall-effect measurements increases linearly with the La concentration in the gas phase, which is attributed to the incorporation of La 3+ ions on the Sr 2+ perovskite sites by substitution inferred from photoemission spectroscopy. The resulting structural defects were discussed concerning the formation of occasional Ruddlesden−Popper-like defects. The thermoelectric properties determined by Seebeck measurements demonstrate the high potential of SrTiO 3 thin films grown by MOVPE for thermoelectric applications.

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MOCVD of Sr-Containing Oxides: Transport Properties and Deposition Mechanisms of the Sr(tmhd)2·pmdeta Precursor

Bedoya

Condorelli

Motta

et al. 2005

Chem. Vap. Deposition

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Metal-organic (MO)CVD processes adopting the Sr(tmhd) 2´p mdeta precursor have been investigated. In-situ Fourier-transform infrared spectroscopy (FTIR) monitoring has shown that Sr(tmhd) 2´p mdeta possesses a low stability which precludes efficient sublimation/evaporation processes, and requires reactors equipped with a direct liquid injector (DLI) for suitable MOCVD processes. The deposition process results in the formation of polycrystalline SrO and/or SrCO 3 films. The kinetics and the mechanism of film growth have been investigated combining in-situ FTIR techniques and ex-situ techniques for chemical and structural analyses ± energy dispersive X-ray (EDX) microanalysis, X-ray photoelectron spectroscopy (XPS), and X-ray diffraction(XRD). Precursor decomposition occurs above 300 C, leading to the formation of ketones and SrO films. Temperatures above 400 C and partial pressures above 9 mtorr favor a further oxidation/combustion of the ligand and its by-products, thus producing greater amounts of CO 2 , and hence of SrCO 3 .

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Strontium β-diketonate complexes with polyamine donor ligands: the synthesis and structural characterization of [Sr(thd)2(L)]n (n=2; L=diethylenetriamine, n=1; L=triethylenetetramine, tetraethylenepentamine and tris(2-aminoethyl)amine) complex

Cited by 19 publications

References 23 publications

Synthesis of Mononuclear Strontium Complexes with Polyether and β-Diketonato Ligands

Synthesis of Mononuclear Strontium Complexes with Polyether and β-Diketonato Ligands

Potential of La-Doped SrTiO₃ Thin Films Grown by Metal–Organic Vapor Phase Epitaxy for Thermoelectric Applications

MOCVD of Sr-Containing Oxides: Transport Properties and Deposition Mechanisms of the Sr(tmhd)2·pmdeta Precursor

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Strontium β-diketonate complexes with polyamine donor ligands: the synthesis and structural characterization of [Sr(thd)2(L)]n (n=2; L=diethylenetriamine, n=1; L=triethylenetetramine, tetraethylenepentamine and tris(2-aminoethyl)amine) complex

Cited by 19 publications

References 23 publications

Synthesis of Mononuclear Strontium Complexes with Polyether and β-Diketonato Ligands

Synthesis of Mononuclear Strontium Complexes with Polyether and β-Diketonato Ligands

Potential of La-Doped SrTiO3 Thin Films Grown by Metal–Organic Vapor Phase Epitaxy for Thermoelectric Applications

MOCVD of Sr-Containing Oxides: Transport Properties and Deposition Mechanisms of the Sr(tmhd)2·pmdeta Precursor

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Potential of La-Doped SrTiO₃ Thin Films Grown by Metal–Organic Vapor Phase Epitaxy for Thermoelectric Applications