Synthesis of novel volatile niobium precursors containing carboxamide for Nb2O5 thin films

Hwang, Jeong Min; Kim, Na Yeon; Shin, Seung Joon; Lee, Ji Hun; Ryu, Ji Yeon; Eom, Taeyong; Park, Bo Keun; Kim, Chang Gyoun; Chung, Taek‐Mo

doi:10.1016/j.poly.2021.115134

Cited by 7 publications

(8 citation statements)

References 39 publications

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“…The t Bu imido group and one oxygen atom of the carboxamide ligand are located in axial positions with deviated bond angles (172.4(3) and 172.25(9)°) from the ideal angle (180°), while the other oxygen atoms form the equatorial plane of the pentagonal bipyramid. The bond angle between the nitrogen atom in the imido group and the five oxygen atoms in the equatorial planes are in ranges of 90.9–104.8° for compound 3 and 91.23–103.20° for compound 5 similar to the reported distorted pentagonal bipyramid geometry complexes. − In particular, one oxygen atom in the equatorial plane from the axial chelating carboxamide is slightly distorted with the plane composed of four other equatorial oxygen atoms in the range of known distorted pentagonal bipyramid geometry complexes (25.21 and 26.80°). The equatorial site bond angle sums were 358.3° ( 3 ) and 358.5° ( 5 ), which approximate the ideal angle of 360°.…”

Section: Resultssupporting

confidence: 60%

“…A series of N -alkoxy carboxamide-type ligands, edpaH and mdpaH, were prepared by the literature procedure . Na(edpa) and Na(mdpa) were prepared by a modified literature method . TaCl 3 (N t Bu)(pyridine) 2 was obtained by modifying the reported methods …”

Section: Methodsmentioning

confidence: 99%

“…23 Na(edpa) and Na(mdpa) were prepared by a modified literature method. 24 TaCl 3 (N t Bu)(pyridine) 2 was obtained by modifying the reported methods. 32 1 H NMR and 13 C NMR spectra were recorded on a Bruker DPX 500 MHz FT-NMR spectrometer.…”

Section: ■ Conclusionmentioning

confidence: 99%

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New Volatile Tantalum Imido Precursors with Carboxamide Ligands

et al. 2021

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A series of Ta(V) t Bu-imido/N-alkoxy carboxamide complexes, TaCl2(N t Bu)(pyridine)(edpa) (1), TaCl(N t Bu)(edpa)2 (2), Ta(N t Bu)(edpa)3 (3), TaCl2(N t Bu)(pyridine)(mdpa) (4), and Ta(N t Bu)(mdpa)3 (5), were successfully synthesized by metathesis reactions between Ta(N t Bu)Cl3(py)2 and several equivalents of Na(edpa) (edpaH = N-ethoxy-2,2-dimethylpropanamide) and Na(mdpa) (mdpaH = N-methoxy-2,2-dimethylpropanamide). Furthermore, complexes 3 and 5 were simply transformed to new dimeric structures [Ta(μ2–O)(edpa)3]2 (6) and [Ta(μ2–O)(mdpa)3]2 (7) with the elimination of the N t Bu imido group by air exposure. Compounds 1–7 were characterized by 1H and 13C nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, elemental analysis, thermogravimetric analysis (TGA), and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis revealed that complexes 3 and 5 have a distorted pentagonal bipyramidal geometry around the central Ta atom, with three monoanionic bidentate N-alkoxy carboxamide ligands and one t Bu imido ligand saturating the coordination of tantalum ions. TGA revealed that complexes 3 and 5 had superior thermal characteristics and stability. These complexes could potentially be applied as precursors for tantalum oxide thin films.

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Section: Resultssupporting

confidence: 60%

Section: Methodsmentioning

confidence: 99%

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New Volatile Tantalum Imido Precursors with Carboxamide Ligands

et al. 2021

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“…This indicates that only pure Nb 2 O 5 is present after the calcination. 36 The decomposition step between 25 °C and 320 °C is ascribed to the loss of water of crystallization and physically absorbed H 2 O molecules. 37 The weight loss observed between 320 °C and 600 °C is the loss of the carbon content present in the Nb 2 O 5 precursor.…”

Section: Resultsmentioning

confidence: 99%

Functionalized ceria–niobium supported nickel catalysts for gas phase semi-hydrogenation of phenylacetylene to styrene

Shittu

Khaleel

Polychronopoulou

et al. 2022

Catal. Sci. Technol.

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“…Furthermore, it has a high refractive index, wide bandgap, good optical quality, and negligible scattering. [ 10,11 ]…”

Section: Introductionmentioning

confidence: 99%

Use of niobium oxide nanoparticles as nanofillers in PVP/PVA blends to enhance UV–visible absorption, opto‐linear, and nonlinear optical properties

Ali

Sayed

Algarni

et al. 2022

Vinyl Additive Technology

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Transition metal oxide (TMO)-filled polymer films have numerous applications, including electromagnetic shielding and nonlinear optical devices.Nb 2 O 5 -filled polyvinyl pyrrolidone (PVP)/polyvinyl alcohol (PVA) blend was prepared using a solution casting process. Pristine and nanocomposite films from these blends were studied. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier infrared spectroscopy confirmed the formation of nanocomposites via interfacial interactions between the polymer chains and Nb 2 O 5 nanoparticles. These nanoparticles influence the amorphous nature and transparency of the PVA/PVP blends. The improvement of D opt (optical density) becomes particularly obvious in blended polymer films with considerable Nb 2 O 5 -nanofiller concentrations. By increasing the weight percentage of Nb 2 O 5 , the probability of producing additional levels in the bandgap increased. The optical absorption coefficient of each nanocomposite film was less than 10 6 m À1 , indicating indirect electron transfer. Thus, the indirect optical band-gap declined from 3.9 to 1.9 eV as calculated from Tauc's and the absorption spectral fitting (ASF) formula. Additionally, the effects of Nb 2 O 5 on the extinction coefficient, refractive index, highfrequency (ε ∞ ), and static-frequency (ε o ) dielectrics have been reported. The nonlinear refractive index and optical susceptibilities (x 1 and x 3 ) were enhanced by increasing the Nb 2 O 5 content in the blend. The penetration depth (δ) and optical limiting (OL) properties were also investigated. The developed nanocomposite materials could be used for advanced technologybased devices such as reflective coatings, opto-linear, and nonlinear optoelectronic applications.

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Synthesis of novel volatile niobium precursors containing carboxamide for Nb2O5 thin films

Cited by 7 publications

References 39 publications

New Volatile Tantalum Imido Precursors with Carboxamide Ligands

New Volatile Tantalum Imido Precursors with Carboxamide Ligands

Functionalized ceria–niobium supported nickel catalysts for gas phase semi-hydrogenation of phenylacetylene to styrene

Use of niobium oxide nanoparticles as nanofillers in PVP/PVA blends to enhance UV–visible absorption, opto‐linear, and nonlinear optical properties

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