3236-82-6

Basic information

• Product Name: NIOBIUM ETHOXIDE
• Synonyms: COLUMBIUM PENTAETHOXIDE;NIOBIUM ETHOXIDE;NIOBIUM ETHYLATE;NIOBIUM PENTAETHOXIDE;NIOBIUM(V) ETHOXIDE;NIOBIUM(V) PENTAETHOXIDE;Ethanol, niobium(5+) salt;niobium(5+) ethanolate
• CAS NO: 3236-82-6
• Molecular Formula: 5C₂H₅O*Nb
• Molecular Weight: 318.21
• EINECS: 221-795-2
• Product Categories: Micro/Nanoelectronics;Niobium;Solution Deposition Precursors;metal alkoxide
• Mol File: 3236-82-6.mol
• Article Data: 10

Chemical Properties

• Melting Point: 6 °C(lit.)
• Boiling Point: 140-142 °C0.1 mm Hg(lit.)
• Flash Point: 97 °F
• Appearance: Yellow to orange-brown/Liquid
• Density: 1.268 g/mL at 25 °C(lit.)
• Refractive Index: n20/D 1.516(lit.)
• Storage Temp.: Flammables area
• Water Solubility: Soluble in organic solvents. Decomposes in water.Miscible with organic solvents.
• Sensitive: Moisture Sensitive
• BRN: 3678883
• CAS DataBase Reference: NIOBIUM ETHOXIDE(CAS DataBase Reference)
• NIST Chemistry Reference: NIOBIUM ETHOXIDE(3236-82-6)
• EPA Substance Registry System: NIOBIUM ETHOXIDE(3236-82-6)

Safety Data

• Hazard Codes: C
• Statements: 10-34
• Safety Statements: 26-36/37/39-45
• RIDADR: UN 2920 8/PG 2
• WGK Germany: 3
• F: 10-21
• TSCA: No
• HazardClass: 3
• PackingGroup: III
• Hazardous Substances Data: 3236-82-6(Hazardous Substances Data)

Usage

Chemical Properties

yellow to orange-brown liquid

Uses

Niobium ethoxide is an important precursor for depositing thin films of niobium oxide and other thin films doped with niobium. These thin films are thermally stable and show valuable magnetic, ferroelectric and good conducting properties, hence finding applications as random access memory (RAM) and photovoltaics

InChI:InChI=1/C2H6O.Nb/c1-2-3;/h3H,2H2,1H3;/q;+5

Synthetic route

niobium pentachloride (10026-12-7) → Nb(5+)*2Cl(1-)*3(OC2H5)(1-)=NbCl2(OC2H5)3 + Nb(5+)*Cl(1-)*4OC2H5(1-)=NbCl(OC2H5)4 + Nb(5+)*4Cl(1-)*OC2H5(1-)=Nb(OC2H5)Cl4 + niobium(V) ethoxide (3236-82-6)

Conditions	Yield
With ethanol In ethanol N2-atmosphere; 0.5 M NbCl5; varying product ratio depending on temperature;

ethanol (64-17-5) + niobium pentachloride (10026-12-7) → niobium(V) ethoxide (3236-82-6)

Conditions	Yield
In benzene introduction of dry NH3 into boiling soln. of NbCl5 in benzene containing CH3OH;; evaporization of soln.;;
With ammonia In toluene byproducts: NH4Cl; to a suspn. of NbCl5 added ethanol and ammonia; filtered, vac. distillated (158°C, 0.1 mbar);

NbCl5*P(C4H9)3 (34800-16-3) + ethanol (64-17-5) → niobium(V) ethoxide (3236-82-6)

Conditions	Yield
With ammonia In benzene alcoholysis on passing NH3 through the reaction soln.;;
With NH3 In benzene alcoholysis on passing NH3 through the reaction soln.;;

Nb(5+)*Br(1-)*4(OC2H5)(1-)=NbBr(OC2H5)4 → niobium(V) ethoxide (3236-82-6) + niobium pentabromide (13478-45-0)

Conditions	Yield
In neat (no solvent) heating;;

niobium(V) ethoxide (3236-82-6) + triphenylbismuthane (603-33-8) + salicylic acid (69-72-7) → Bi2Nb2(μ-O)(sal)4(Hsal)4(OEt)2

Conditions	Yield
In toluene under Ar; suspn. of Bi deriv. and salicylic acid in PhMe refluxed for 1 h, cooled to room temp., added dropwise Nb ethoxide, stirred at room temp. for 24 h; concd. in vac., washed (Et2O), dried in vac., recrystd. from CH2Cl2/hexane; elem. anal.;	69%

4-methyl-2-mercaptophenol (60774-07-4) + niobium(V) ethoxide (3236-82-6) + triethylamine (121-44-8) → HN(C2H5)3(1+)*Nb(C7H6OS)3(1-) = (HN(C2H5)3)[Nb(C7H6OS)3] (188349-10-2)

Conditions	Yield
In methanol byproducts: EtOH; (inert atmosphere); stirring (1 h); evapn. (vac.), stirring with Et2O for several h, filtration, recrystn. (MeCN/Et2O); elem. anal.;	67%

niobium(V) ethoxide (3236-82-6) + triphenylbismuthane (603-33-8) + salicylic acid (69-72-7) → BiNb4(μ-O)4(sal)4(Hsal)3(Oi-Pr)4

Conditions	Yield
With Mg(OOCCH3)2 In toluene under Ar; suspn. of Bi deriv. and salicylic acid in PhMe refluxed for 1 h, concd. in vac., redissolved in 2-propanol, added Mg salt, added dropwise Nb ethoxide, left at room temp. for 14 d; filtered, redissolved in CH2Cl2, filtered (Celite), added hexane; elem. anal.;	57%
With NaOOCCH3 In toluene under Ar; react. of Bi deriv. with Nb ethoxide and ligand;	0%
In toluene under Ar; react. of Bi deriv. with Nb ethoxide and ligand;	0%

hexamethyldisilathiane (3385-94-2) + tetraethylammonium chloride (56-34-8) + niobium(V) ethoxide (3236-82-6) → 4(C2H5)4N(1+)*Nb6S17(4-)*3CH3CN=((C2H5)4N)4[Nb6S17]*3CH3CN (95979-72-9)

Conditions	Yield
In acetonitrile byproducts: Me3SiOEt, Me3SiCl; a mixt. of Nb(OEt)5 and Et4NCl in MeCN was stirred at 50°C for 20-25 min, to the warm mixt. was added with stirring (Me3Si)2S, after it was cooled to room temp., the mixt. was stirred for 4-12 h; mixt. was filtered, ether was added, ppt. was recrystd. from MeCN; elem.anal.;	55%

hexamethyldisilathiane (3385-94-2) + tetraethylammonium chloride (56-34-8) + niobium(V) ethoxide (3236-82-6) + iron(II) chloride + sodium thioethylate (811-51-8) → 3N(C2H5)4(1+)*{Nb2Fe6S8(SC2H5)9}(3-) = (N(C2H5)4)3{Nb2Fe6S8(SC2H5)9}

Conditions

Yield

With LiOC2H5; N,N,N',N'-tetramethylethylenediamine In acetonitrile byproducts: NaCl; (N2); stirring a CH3CN soln. of LiOEt and (Me3Si)2S; adding a ether soln. of Nb(OEt)5; stirring for 1 h; addn. of tetramethylethylenediamine; diluting (CH3CN); addn. of Et4NCl, FeCl2 and NaSEt; stirring overnight; filtration; concn.; diffusing ether into the filtrate; agitating;removing the powder with the mother liquor maintaining at 5°C for 5 d; collecting the crystals; washing (CH3CN/ether, ether); elem. anal.;

33%

zinc diacetate (557-34-6) + niobium(V) ethoxide (3236-82-6) + bismuth(III) acetate (22306-37-2, 29094-03-9, 36476-26-3, 73206-34-5) → BZN

niobium(V) ethoxide (3236-82-6) + titanium(IV)isopropoxide (546-68-9) + silica gel (112926-00-8, 7631-86-9) → Reaxys ID: 11383861

Conditions	Yield
Stage #1: niobium(V) ethoxide; titanium(IV)isopropoxide; silica gel In methanol at 23℃; for 18.1667h; Stage #2: With oxygen at 450℃; for 4h;

niobium(V) ethoxide (3236-82-6) + silica gel (112926-00-8, 7631-86-9) → Nb2O5#SiO2

Conditions	Yield
Stage #1: niobium(V) ethoxide; silica gel In methanol at 20℃; for 18.1667h; Stage #2: With oxygen at 450 - 550℃; for 4h;

niobium(V) ethoxide (3236-82-6) + lead acetate (301-04-2) + magnesium (7439-95-4) → lead magnesium niobate

Conditions	Yield
With ammonia In ethanol; cyclohexane Nb(OC2H5)5 and Pb(CH3COO)2 soln. in EtOH refluxing (16 h), cyclohexane and Mg addn., refluxing (2 h), aq. NH3 addn., refluxing (80°C, 24 h); drying (100°C); scanning electron microscopy;
With ammonia In ethanol; cyclohexane; acetone Nb(OC2H5)5 and Pb(CH3COO)2 soln. in EtOH refluxing (16 h), cyclohexane and Mg addn., refluxing (2 h), acetone addn., aq. NH3 addn., refluxing (80°C, 24 h); drying (100°C); scanning electron microscopy;

niobium(V) ethoxide (3236-82-6) → niobium(V) oxide

Conditions	Yield
With water; 1,8-diazabicyclo[5.4.0]undec-7-ene; acetylacetone In ethanol High Pressure; Nd(OC2H5)5 with C5H12O2 stirred for 10 min under N2 atm., C2H5OH added, stirred at 50°C for 30 min; 1,8-diazabicyclo(5.4.0)undec-7-ene and C5H12O2 added, evapd. at 40°C; H2O added; heated to 230°C in autoclave for 12 h; films prepd.; detd. by XRD, SEM, UV-VIS-spectroscopy;
Kinetics; byproducts: C4H10, C4H8, C2H6; gas-phase thermal decompn. under static condns. (const. temp. in range 300-350°C, static vac. apparatus) without or with additives (ethanol, ether); further byproducts: H2, Et2O, EtOH, CH2=CH2, H2O; monitoring by manometric method; mass spectroscopy;
In water at 79.84℃;
Stage #1: niobium(V) ethoxide In tetrahydrofuran for 0.166667h; Stage #2: With hydrogenchloride In tetrahydrofuran; water for 1h;

niobium(V) ethoxide (3236-82-6) → niobium carbide

Conditions	Yield
With tartaric acid; acetylacetone In butan-1-ol Nb ethoxide and acetylacetone soln. refluxing (N2, 50°C, 1 h), tartaric acid addn., refluxing (80°C), partial evapn., fibre or film preparation, heat treatment (Ar, 500-1500°C, 1 h); X-ray diffraction, electron microscopy;
With benzene-1,2-diol; acetylacetone In butan-1-ol Nb ethoxide and acetylacetone soln. refluxing (N2, 50°C, 1 h), catechol addn., refluxing (80°C), partial evapn., fibre or film preparation, heat treatment (Ar, 500-1500°C, 1 h); X-ray diffraction, electron microscopy;
With ethylene glycol; acetylacetone In butan-1-ol Nb ethoxide and acetylacetone soln. refluxing (N2, 50°C, 1 h), ethylene glycol addn., refluxing (80°C), partial evapn., fibre or film preparation, heat treatment (Ar, 500-1500°C, 1 h); X-ray diffraction, electron microscopy;

water (7732-18-5) + niobium(V) ethoxide (3236-82-6) → hydrous niobium(V) oxide

Conditions	Yield
In water hydrolysis of Nb(OC2H5)5;;
In water hydrolysis of Nb(OC2H5)5;;

water (7732-18-5) + sodium ethanolate (141-52-6) + niobium(V) ethoxide (3236-82-6) → sodium niobate

Conditions	Yield
With oil In ethanol stoich., microemulsions (water, oil, ethoxide) mixed, powders annealed in air at 200-1000°C for 1-12 h; elem. anal., SEM, XRD;

niobium(V) ethoxide (3236-82-6) + isopropyl alcohol (67-63-0) → niobium isopropoxide

Conditions	Yield
In further solvent(s)
In further solvent(s)

magnesium (β-diketonate C11H19O2)2 + tetraethyl lead + oxygen (80937-33-3) + niobium(V) ethoxide (3236-82-6) → lead magnesium niobate

Conditions	Yield
In gaseous matrix epitaxial drown in cold-wall, low-pressure metal-organic chemical vapordeposition reactor with resistive substrate heater(on (001) SrTiO3 and SrRuO3/SrTiO3); N2 carrier gas; substrate temp. 700-800°C; 6 Torr; O2 oxidant introduced into reactor; XRD; scanning probe microscope image;

barium hydroxide octahydrate + niobium(V) ethoxide (3236-82-6) + magnesium (7439-95-4) → barium magnesium niobate

Conditions	Yield
In ethanol Nb(OC2H5)5 soln. with Mg refluxing (15 h), Ba(OH)2*8H2O addn. stirring (room temp., 2 h), refluxing (80°C, 24 h); drying (100°C); scanning electron microscopy;
In ethanol; acetone Nb(OC2H5)5 soln. with Mg refluxing (15 h), acetone addn., Ba(OH)2*8H2O addn. stirring (room temp., 2 h), refluxing (80°C, 24 h); drying (100°C); scanning electron microscopy;

niobium(V) ethoxide (3236-82-6) + barium (7440-39-3) + strontium → strontium barium niobate

Conditions	Yield
With ethoxyethane In ethanol under N2; dissolved Sr and Ba; refluxed for 12 h; mixed with Nb(OEt)5 soln.; refluxed; concd.; dried at 100°C in air; heated at 600-1200°C in an oxygen flow for 4 h; XRD; DTA; TG; IR;

niobium(V) ethoxide (3236-82-6) + barium (7440-39-3) + strontium → strontium barium niobate

Conditions	Yield
With ethoxyethane In ethanol under N2; dissolved Sr and Ba; refluxed for 12 h; mixed with Nb(OEt)5 soln.; refluxed; concd.; for powder: dried (100°C, air); heated (700°C, oxygen flow, 4 h); for films: dip-coated, crystd. on sapphire or MgO(100) at 700°C for 4 h; XRD; DTA; TG; IR;

niobium(V) ethoxide (3236-82-6) + barium (7440-39-3) → barium niobate

Conditions	Yield
With ethoxyethane In ethanol under N2; dissolved Ba; refluxed for 12 h; mixed with Nb(OEt)5 soln.; refluxed; concd.; dried at 100°C in air; heated at 600-1200°C in an oxygen flow for 4 h; XRD; DTA; TG; IR;

sodium ethanolate (141-52-6) + niobium(V) ethoxide (3236-82-6) + barium (7440-39-3) → barium sodium niobate

Conditions	Yield
In ethanol (N2), Ba refluxing in ethanol (80°C, 1 h), NaOEt and Nb(OEt)5 addn., refluxing (18 h), dip coating (SiO2, Pt/MgO substrate), drying, calcination (500°C, 1 h), crystalization (800°C, 1 h); X-ray diffraction;

niobium(V) ethoxide (3236-82-6) + strontium → strontium niobate

Conditions	Yield
With ethoxyethane In ethanol under N2; dissolved Sr and Ba; refluxed for 12 h; mixed with Nb(OEt)5 soln.; refluxed; concd.; dried at 100°C in air; heated at 600-1200°C in an oxygen flow for 4 h; XRD; DTA; TG; IR;

lithium nitrate + niobium(V) ethoxide (3236-82-6) → lithium niobate

Conditions	Yield
In not given soln. of LiNO3 and Nb(OEt)5 is heated (resin method), resin is pyrolyzed and then calcined (1000 K for 12 h), resulting metal-oxide powder is pressed into pellets, sintered at 1400-1600K for 24 h; XRD;

potassium ethoxide (917-58-8) + niobium(V) ethoxide (3236-82-6) → KNbO3, perovskite

Conditions	Yield
With H2O In ethanol in pure, dry N2; stirred; refluxed for 24 h; hydrolysed by addn. of H2O/ethanol, evapd.; dried at 100°C; heated at 650°C in air; XRD; TG; DTA;

niobium(V) ethoxide (3236-82-6) + titanium(IV)isopropoxide (546-68-9) + strontium ethoxide (2914-18-3, 16436-92-3, 16436-94-5) → niobium doped strontium titanate

Conditions	Yield
In ethanol; 2-methoxy-ethanol (N2); reflux of soln. of Sr(OEt)2 and Ti(O(i-Pr))4 in EtOH and MeOCH2CH2OH, addn. of soln. of Nb(OEt)5 in EtOH as a molar ratio Sr:Ti:Nb= 1:0.95:0.05; reflux for 24 h, evapn., pptn., drying, heating at 400-1000°C in O2 for 1 h;

dihydrogen peroxide (7722-84-1) + sodium ethanolate (141-52-6) + niobium(V) ethoxide (3236-82-6) → sodium niobate

Conditions	Yield
In neat (no solvent) aq. H2O2 added to soln. of ethoxides in ethanol, stirred in air for morethen 2 h, refluxed for 3 h at 100 °C with H2O addition, residual H2O2 decomposed on Pt at 100 °C for 3 h, dried in air, annealed at 400-700 °C for 1.5 h in O2; powder XRD, TGA, DTA,;

niobium(V) ethoxide (3236-82-6) + lead(II) acetate trihydrate (6080-56-4) + magnesium(II) acetate tetrahydrate (16674-78-5) → lead magnesium niobate

Conditions	Yield
With H2C2O4*2H2O; HNO3 In water aq. Pb-compd. soln.and HNO3 addn. to Nb-compd., Mg acetate addn., freeze-drying, calcination (800-875°C, 4 h), pelletizing, sintering (1000-1200°C, 4 h); scanning electron microscopy;
Pb and Mg acetate addn to Nb-compd., spray pyrolysis, calcination (800-900°C, 4 h), pelletizing, sintering (1000-1200°C, 4 h); scanning electron microscopy;

magnesium ethylate (2414-98-4) + niobium(V) ethoxide (3236-82-6) + lead(II) acetate trihydrate (6080-56-4) → lead magnesium niobate

Conditions	Yield
In 2-methoxy-ethanol Pb-compd. soln. heating (124°C), Nb- and Mg-compd. soln. addn, water addn., calcination (700-1000°C), pelletizing, sintering (1000-1200°C, 4 h); scanning electron microscopy;

Upstream product

• 64-17-5 ethanol 
• 10026-12-7 niobium pentachloride 
• 67-63-0 isopropyl alcohol 
• 34800-16-3 NbCl₅*P(C₄H₉)3 

Downstream Products

• 917988-41-1 ((C₆H₁₁)6Si₆O₁₁NbOC₂H₅)2 
• 81814-57-5 tris ethoxy niobium(V) benzilate 

Relevant articles and documents

Electrochemical synthesis of niobium(V) ethylate

The effect exerted by the supporting electrolyte and cathode material on the anodic dissolution of niobium in ethanol solutions was studied. Pleiades Publishing, Inc., 2006.

Synthesis of potassium niobate from metal alkoxides

Preparation of potassium niobate from metal alkoxides was investigated. Potassium-niobium ethoxide, KNb(OC2H5)6, and potassium-niobium propoxide, KNb(OC3H7)6, were synthesized and subsequently hydrolyzed using several water concentrations (0.75 to 6.0 mol of water/(mol of alkoxide)). Rapid precipitation of potassium-deficient particles occurred when higher concentrations of water were used. This resulted in the formation of a multiphase material after calcination, as X-ray diffraction showed the presence of both KNbO3 and potassium-deficient oxide phases(s). Single-phase KNbO3 could be prepared by two methods: (1) hydrolysis of KNb(OC3H7)6/propanol solutions using 1 mol of water (per mole of propoxide) added as a water/propanol solution and (2) hydrolysis of KNb(OC2H5)6/ethanol solutions using 1 mol of water (per mole of ethoxide) added as a water/methanol solution. The latter method provided advantages of low calcination temperature for the formation of single-phase KNbO3 and low weight loss after calcination.

Sol-gel synthesis and the luminescent properties of CaNb2O6 phosphor powders

Synthesis and luminescence properties of CaNb2O6 oxides by the sol-gel process were investigated. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), photoluminescence spectroscopy and absorption spectra. The PL spectra excited at 257 nm have a broad and strong blue emission band maximum at 457 nm, corresponding to the self-activated luminescence of the niobate octahedra group [NbO6]7-. The optical absorption spectra of the 700 °C sample exhibited the band-gap energies of 3.53 eV.

PROCESSES FOR PREPARING NIOBIUM ALKOXIDES, AND NIOBIUM ALKOXIDES PREPARED THEREBY

Processes for preparing high-purity niobium alkoxides, especially niobium ethoxide, are described which include: (a) providing a crude niobium alkoxide starting material comprising at least one compound of the general formula (I) [in-line-formulae]Nb(OR)5 ??(I)[/in-line-formulae]wherein each R independently represents a linear or branched C1-12 alkyl group; and (b) contacting the crude niobium alkoxide starting material with a treatment medium comprising a component selected from the group consisting of (i) one or more alcohols of the general formula (II) in an amount of 0.01 to 5% by weight, (ii) air or an oxygen-containing gas, and (iii) combinations thereof; [in-line-formulae]R1OH ??(II)[/in-line-formulae]wherein each R1 independently represents a linear or branched C1-12 alkyl group.