niobium pentachloride
Niobium(V) chloride
CAS: 10026-12-7
Molecular Formula: Cl5Nb
niobium pentachloride - Names and Identifiers
niobium pentachloride - Physico-chemical Properties
| Molecular Formula | Cl5Nb |
| Molar Mass | 270.17 |
| Density | 2.75g/mLat 25°C(lit.) |
| Melting Point | 204.7°C(lit.) |
| Boling Point | 254°C(lit.) |
| Flash Point | 248.2°C |
| Water Solubility | Soluble in water, alcohol, HCl, and Carbon tetrachloride. |
| Solubility | Soluble in alcohol, hydrochloric acid, carbon tetrachloride and chloroform. |
| Vapor Presure | 22.8hPa at 153.8℃ |
| Appearance | powder |
| Specific Gravity | 2.75 |
| Color | Yellow |
| Merck | 14,6557 |
| Storage Condition | no restrictions. |
| Sensitive | Moisture Sensitive |
niobium pentachloride - Risk and Safety
| Risk Codes | R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R34 - Causes burns |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S27 - Take off immediately all contaminated clothing. S28 - After contact with skin, wash immediately with plenty of soap-suds. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. |
| UN IDs | UN 3260 8/PG 2 |
| WGK Germany | 3 |
| RTECS | QU0350000 |
| FLUKA BRAND F CODES | 21 |
| TSCA | Yes |
| HS Code | 28273985 |
| Hazard Class | 8 |
| Packing Group | III |
| Toxicity | LD50 in mice (mg/kg): 61 i.p., 940 orally (Haley); LD50 in mice, rats (mg/kg): 829, 1400 orally (Zhilova, Kasparov) |
niobium pentachloride - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | niobium pentachloride is a yellow-white monoclinic crystal with a melting point of 204.7 ℃ and a boiling point of 254 ℃. it is a strong Lewis acid that can promote a variety of organic synthesis reactions. |
| application | niobium chloride (v), I .e. niobium pentachloride, can be used to prepare niobium pentoxide/reduced graphene oxide nanocomposite anode material or a high permeability nano infrared excitation medium that can efficiently absorb infrared short wave. |
| Use | It is used to form mixed chlorine-aromatic oxides, such as [Nb(OC6H3-2 6-i-Pr2)2 Cl3]2, which can form pyridine or phosphine adduct with six coordination twisted geometry. |
| Production method | Niobium pentabromide synthesis device 1-auxiliary receiving tube; 2-product; 3-external heater; 4-Br2;5-N2 preparation method [101,102] This compound can be prepared by reacting metal niobium and chlorine. The sample boat containing 10g of niobium powder is put into a reaction tube made of borosilicate acid glass with an inner diameter of 25mm and a length of 900mm. The sample boat is placed at a position with a length of about 1/3 from the gas inlet. The air in the tube is replaced with rare gas, and then replaced with dry chlorine gas. When chlorine gas flows into the reaction tube at a rate of about 200 mL/min, and the sample part is heated to about 300 ℃, then niobium pentachloride is yellow crystal precipitated at the room temperature of the reaction tube. The discharged gas is introduced into the chlorine gas absorption bottle (containing a mixed aqueous solution of sodium hydroxide and sodium bicarbonate) and is completely absorbed. After the reaction is over, cool, replace the chlorine gas with a rare gas, and take out the niobium pentachloride from the rare gas gas stream, or melt and seal the two ends of the niobium chloride (V) precipitated in the reaction tube (in this case, It is advisable to pre-form a necking with an inner diameter of 10mm on the reaction tube). In addition, niobium pentoxide and carbon with a molar ratio of 6 times can be mixed, chlorine gas with a flow rate of 200~300 mL/min can be introduced into the sample, and chlorination reaction can be carried out at 500~700 ℃. The prepared niobium pentachloride and niobium trichlorooxide NbOCl3 mixture is passed through the carbon layer heated to 600°C together with chlorine, and niobium pentachloride can also be produced. |
| category | corroded articles |
| toxicity classification | poisoning |
| acute toxicity | oral-rat LD50: 1400 mg/kg; Oral-mouse LD50: 829 mg/kg |
| explosive hazard characteristics | hydrolysate is corrosive to skin and cornea |
| flammability hazard characteristics | toxic hydrogen chloride smoke when exposed to water; heating to decompose toxic chloride smoke |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; It is stored separately from alkali, cyanide and h pore-forming agent. |
| fire extinguishing agent | dry sand, dry stone powder, dry soil |
Last Update：2024-04-10 22:29:15
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