TANTALUM(V) CHLORIDE CAS:7721-01-9

  • Product Name:TANTALUM(V) CHLORIDE
  • CAS:7721-01-9
  • Molecular formula:Cl5Ta
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TANTALUM(V) CHLORIDE CAS:7721-01-9

TANTALUM(V) CHLORIDE CAS:7721-01-9 Basic information

Product Name: TANTALUM(V) CHLORIDE
Synonyms: 2126087;um(V) chL;JACS-7721-1-9;TaCl5;Tantalum chloride (TaCl5);tantalumchloride(tacl5);TANTALUM(V) CHLORIDE;TANTALUM(+5)CHLORIDE
CAS: 7721-01-9
MF: Cl5Ta
MW: 358.21
EINECS: 231-755-6
Product Categories: Inorganic Chemicals;metal halide
Mol File: 7721-01-9.mol

TANTALUM(V) CHLORIDE CAS:7721-01-9 Chemical Properties

density: 3.68 g/mL at 25 °C(lit.)
Melting point: 221 °C
Boiling point: 242 °C
form: powder
storage temp.: Storage temperature: no restrictions.
Water Solubility: Soluble in water (reacts). Also soluble in ethanol, ether and carbon tetrachloride.
InChIKey: OEIMLTQPLAGXMX-UHFFFAOYSA-I
Fp: 242°C
solubility: Soluble in ether, carbon tetrachloride, sulfuric acid and potassium hydroxide. Slightly soluble in ethanol.
Merck: 14,9054
Sensitive: Moisture Sensitive
Specific Gravity: 3.68
CAS DataBase Reference: 7721-01-9(CAS DataBase Reference)
EPA Substance Registry System: Tantalum chloride (TaCl5) (7721-01-9)

Item

 

Composition

量(Content)(%)

规格值(理论值)

Specification

(Theoretical value)

制品测定值

(Product

assay value)

成分含量Composition Content

 

TaCl5

 

99.95

 

99.95

O

0.03

0.007

 

杂质含量不大于

%Impurity Content Maximum

%

Fe

 

 

 

杂质 0.1Wt% max

Impurity 0.1Wt% max

0.0010

Ti

0.0008

Mo

0.0009

Mg

0.0010

N

0.0009

W

0.0008

Nb

0.0007

Cr

0.0009

Si

0.0011

注:1.产品遇空气有雾状产生,隔绝空气就消失.用完严格密封好!!!

2.产品遇水显酸性.

Remarks

1 After use, please seal it. When open the package, the product meet the air will produce smog, isolate the air, the fog will disappear.

2The product show acidity when meet water.

TANTALUM(V) CHLORIDE Usage And Synthesis
Physical PropertiesYellow monoclinic crystals; hygroscopic; critical temperature 494°C; critical volume 402 cm3/mol; can be sublimed without decomposition in chlorine atmosphere; reacts with water; soluble in ethanol, ether and carbon tetrachloride.
PreparationTantalum pentachloride is prepared by heating tantalum metal with excess chlorine:
2Ta + 5Cl2 → 2TaCl5
ReactionsTantalum pentachloride is hydrolyzed by water to form hydrous tantalum pentoxide, Ta2O5•nH2O and hydrochloric acid:
2TaCl5 + 5H2O → Ta2O5 + 10HCl
Reaction with hydrofluoric acid yields tantalum pentafluoride:
TaCl5 + 5HF → TaF5 + 5HCl
Tantalum pentachloride forms adducts with donor solvent molecules. Also, it forms several complexes and organometallic derivatives.
Reactions with alcohols in the presence of an amine forms dinuclear alkoxides. Thus, with ethanol in the presence of diethylamine, the dinuclear tantalum ethoxide, Ta2(OC2H5)10, is obtained.
Reaction with dimethylzinc forms dichlorotrimethyl tantalum, in which three chlorine atoms are substituted with methyl groups:
2TaCl5 + 3Zn(CH3)2 → 2(CH3)3TaCl2 + 3ZnCl2
Reaction with cyclopentadienyl sodium yields bis(cyclopentadienyl) tantalum trichloride:
TaCl5 + 2C5H5 Na → (C5H5)2TaCl3 + 2NaCl
Chemical PropertiesPale-yellow, crystalline powder; highly reactive. Decomposed by moist air. Soluble in alcohol and potassium hydroxide solution. Keep well stoppered.
Physical propertiesYellow monoclinic crystals; hygroscopic; density 3.68 g/cm3; melts at 216°C; vaporizes at 239.4°C; critical temperature 494°C; critical volume 402 cm3/mol; can be sublimed without decomposition in chlorine atmosphere; reacts with water; soluble in ethanol, ether and carbon tetrachloride.
UsesChlorination of organic substances, intermediate, production of pure metal.
Production MethodsTantalum pentachloride, TaCl5, forms strongly hydroscopic, needle-shaped white crystals. It is produced on an industrial scale in large tonnage by the chlorination of tantalum scrap or ferrotantalum with NaFeCl4 or by the reductive chlorination of natural ores or synthetic raw materials. High purity TaCl5 is hydrolyzed with steam and thus converted to Ta2O5 of the highest purity. The reduction of TaCl5 with Mg or Al was repeatedly attempted but this thermite-type process never attained any industrial application. TaCl5 is soluble in absolute alcohol, forming the corresponding alkoxides. The alkoxides as well as the chlorides are suitable products for the deposition of tantalum or tantalum pentoxide layers.
Safety ProfilePoison by intraperitoneal route. Moderately toxic by ingestion. When heated to decomposition it emits toxic fumes of Cl-.
Purification MethodsPurify it by sublimation in a stream of Cl2. It forms colourless needles when pure (yellow when contaminated with even less than 1% of NbCl5). It is sensitive to H2O; even in conc HCl it decomposes to tantalic acid. It is soluble in EtOH. [Rolsten J Am Chem Soc 80 2952 1958, Brauer in Handbook of Preparative Inorganic Chemistry (Ed Brauer) Academic Press Vol II p 1302 1965.]


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