339202

Niobium(V) ethoxide

99.95% trace metals basis

• Synonym(s): NbOEt, Niobium ethanolate, Niobium ethylate, Niobium pentaethoxide, Pentaethoxyniobium
• Linear Formula: Nb(OCH₂CH₃)₅
• CAS Number: 3236-82-6
• Molecular Weight: 318.21
• Beilstein: 3678883
• EC Number: 221-795-2
• MDL number: MFCD00015122
• UNSPSC Code: 12352103
• PubChem Substance ID: 24860621
• NACRES: NA.23

Properties

• 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

Description

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 [1], NaNbO₃ [2], andTiNb₂O₇.[3] 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 [1], nanofibers [3], nanotubes [4], and microspheres. [5] Niobium(V) ethoxide is also commonly added to other metal alkoxides to dope metal oxides, most commonly titania, with niobium. [6]

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.

Safety Information

• Pictograms: GHS02
• Signal Word: Warning
• Hazard Statements: H226
• Precautionary Statements: P210 - P233 - P240 - P241 - P242 - P243
• Hazard Classifications: Flam. Liq. 3
• Storage Class Code: 3 - Flammable liquids
• WGK: WGK 3
• Flash Point(F): 96.8 °F - closed cup
• Flash Point(C): 36 °C - closed cup
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves