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Sigma-Aldrich

Niobium(V) ethoxide

99.95% trace metals basis

Synonym(s):

NbOEt, Niobium ethanolate, Niobium ethylate, Niobium pentaethoxide, Pentaethoxyniobium

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About This Item

Linear Formula:
Nb(OCH2CH3)5
CAS Number:
3236-82-6
Molecular Weight:
318.21
Beilstein/REAXYS Number:
3678883
EC Number:
221-795-2
MDL number:
MFCD00015122
UNSPSC Code:
12352103
PubChem Substance ID:
24860621
NACRES:
NA.23

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
GHS02

signalword

Warning

hcodes

H226

Hazard Classifications

Flam. Liq. 3

Storage Class

3 - Flammable liquids

wgk_germany

WGK 3

flash_point_f

96.8 °F - closed cup

flash_point_c

36 °C - closed cup

ppe

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

Certificates of Analysis (COA)

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European Materials Research Society Monographs, 5, 93-100 (1992)
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)
Sol?gel synthesis and characterization of Nb2O5 powders.
Ristic M, et al.
Materials Letters, 58, 2658-2663 (2004)
TiNb2O7 hollow nanofiber anode with superior electrochemical performance in rechargeable lithium ion batteries.
Yu H, et al.
Nano Energy, 38, 109-117 (2017)
Yujing Liu et al.
ACS nano, 4(9), 5373-5381 (2010-08-26)
Crystalline niobium-doped titania nanoparticles were synthesized via solvothermal procedures using tert-butyl alcohol as a novel reaction medium, and their assembly into mesoporous films was investigated. The solvothermal procedure enables the preparation of crystalline doped and undoped nonagglomerated titania nanoparticles, whose
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