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Sigma-Aldrich

Niobium(V) ethoxide

99.95% trace metals basis

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Synonym(s):
NbOEt, Niobium ethanolate, Niobium ethylate, Niobium pentaethoxide, Pentaethoxyniobium
Linear Formula:
Nb(OCH2CH3)5
CAS Number:
Molecular Weight:
318.21
Beilstein/REAXYS Number:
3678883
EC Number:
MDL number:
UNSPSC Code:
12352103
PubChem Substance ID:
NACRES:
NA.23

Quality Level

assay

99.95% trace metals basis

form

liquid

reaction suitability

core: niobium

refractive index

n20/D 1.516 (lit.)

bp

142 °C/0.1 mmHg (lit.)

mp

5-6 °C (lit.)

density

1.268 g/mL at 25 °C (lit.)

SMILES string

CCO[Nb](OCC)(OCC)(OCC)OCC

InChI

1S/5C2H5O.Nb/c5*1-2-3;/h5*2H2,1H3;/q5*-1;+5

InChI key

ZTILUDNICMILKJ-UHFFFAOYSA-N

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General description

Niobium(V) ethoxide is a metal-organic compound that dimerizes in solution to form Nb2(OEt)10 molecules. At room temperature, it is a colorless liquid that is miscible with some organic solvents, but which hydrolyzes readily. Niobium(V) ethoxide freezes at 5 °C and boils at 142 °C at 0.1 mmHg. It can be synthesized by the electrochemical reaction of ethanol with niobium plate and stainless-steel electrodes in the presence of tetraethylammonium chloride (TEAC) as the conductive additive.

Application

Niobium(V) ethoxide is a synthetic precursor for niobium oxides, for example Nb2O5 , NaNbO3 , andTiNb2O7. Niobium(V) ethoxide is commonly used in colloidal solution-based syntheses like sol-gel processing and electrospinning. These chemistries allow researchers to control the microstructure to form gels , nanofibers , nanotubes , and microspheres. Niobium(V) ethoxide is also commonly added to other metal alkoxides to dope metal oxides, most commonly titania, with niobium.

Because of its low boiling point and low decomposition temperature (~325-350 °C),niobium(V) ethoxide is also used as a precursor in atomic-layer deposition, chemical vapor deposition, and metal-organic chemical vapor deposition of niobium oxides.

It can also be used as a dopant to prepare Nb-doped TiO2 photoanode for dye-sensitized solar cells (DSSC). The doping of Nb lowers the conduction band of TiO2 enhancing electron injection and transfer ability of TiO2 photoanode. This results in a significant increase in the performance of DSSC.

Features and Benefits

The purity and volatility of Niobium(V) ethoxide makeit a suitable precursor for atomic layer deposition and chemical vapordeposition of niobium oxide.

pictograms

Flame

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Warning

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Hazard Classifications

Flam. Liq. 3

wgk_germany

WGK 3

flash_point_f

closed cup

flash_point_c

closed cup

ppe

Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter


Certificates of Analysis (COA)

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Porosity-Controlled TiNb2O7 Microspheres with Partial Nitridation as A Practical Negative Electrode for High-Power Lithium-Ion Batteries.
Park H, et al.
Advanced Energy Materials, 5, 1401945-1401945 (2015)
European Materials Research Society Monographs, 5, 93-100 (1992)
Synthesis of hierarchical porous TiNb2O7 nanotubes with controllable porosity and their application in high power Li-ion batteries
Park H, et al.
Journal of Material Chemistry A, 5, 6958-6965 (2017)
The Effects of Crystal Structure and Electronic Structure on Photocatalytic H2 Evolution and CO2 Reduction over Two Phases of Perovskite-Structured NaNbO3.
Peng L, et al.
The Journal of Physical Chemistry Letters, 116, 7621-7628 (2012)
Chemistry of Materials, 16, 2034-2040 (2004)

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