ТЕТРАХЛОРБИС (ТЕТРАГИДРОФУРАН) НИОБИЙ (IV)

Description

Tetrachlorobis(tetrahydrofuran)niobium(IV) is a complex of niobium(IV) chloride with tetrahydrofuran. THF donor molecules are coordinated to the metal and make the compound more soluble and easier to work with than ligand-free NbCl4. Commercial purity is usually 96%. It is obtained from available niobium pentachloride in two stages: reduction of NbCl5 with aluminum powder in acetonitrile, then introduction of tetrahydrofuran.

Basic Attributes

• CAS No.: 61247-57-2
• Chemical formula according to the card: C4H8Cl4NbO
• Molecular Weight: 306.82
• Exact weight: 304.83900
• DSSTox ID: DTXSID10369857
• PSA: 9.23000
• XLogP3: 3.55480
• Melting point: 93 °C with decomposition (literature data)
• Boiling point: 68.3 °C at 760 mm Hg. Art. — the value corresponds to tetrahydrofuran, which is cleaved from the complex
• Flash point: 121°F (about 49°C)
• Storage conditions: 2–8 °C

The formula and molecular weight in the card correspond to a complex with one molecule of THF, while the name and synonyms describe the bis-adduct NbCl4(THF)2 with a gross formula of C8H16Cl4NbO2 and a mass of about 378.9. The discrepancy was transferred from the original data without editing and requires clarification according to the batch passport.

Scope of application

• a common precursor in niobium chemistry: adducts of this type are more stable and soluble than the original tetrachloride, and therefore serve as starting compounds for further transformations
• synthesis of niobium(IV) complexes with phosphines; with ditertiary phosphines, binuclear complexes are formed
• reactions with thio-, seleno- and tellurium esters give six- and eight-coordinate niobium(IV) complexes
• starting material for the production of other niobium-containing materials and coordination compounds

Safety Information

• Hazard Statements: H228 - Highly flammable solid; H314 - causes severe skin burns and eye damage
• Precautions: P210, P280, P305+P351+P338, P310
• Labels: F (flammable), C (corrosive)
• Hazard class code: 11-34
• Safety instructions: 16-26-27-36/37/39-45
• WGK Germany: 3
• Transport: UN 2925, class 4.1, packing group II
• GHS classification, signal word “Danger”: H228 (90.48%); prescriptions P210, P240, P241, P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P370+P378, P405, P501
• Reason: Aggregated GHS data from 42 companies for 2 notifications to the ECHA Register C and L

Storage and handling

Store at 2–8 °C in an airtight container under inert gas. The complex is sensitive to moisture and corrosive; work is carried out in a fume hood, in a glove box or using the Schlenk technique. Durable gloves, closed-type glasses, and protective clothing are required. In case of contact with eyes, rinse for several minutes, remove contact lenses and immediately consult a doctor. Keep away from sources of ignition, water and oxidizers.