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| CAS No.: | 7440-42-8 |
|---|---|
| Name: | Boron |
| Molecular Structure: | |
|
|
|
| Formula: | B |
| Molecular Weight: | 14.8428 |
| Synonyms: | Borfast;Boron atom;Boron element;Borotrac;SB 95;SB 95 (boron);Trona;Trona(element);V 99; |
| EINECS: | 231-151-2 |
| Density: | 2.34 g/mL at 25oC(lit.) |
| Melting Point: | 2180 °C |
| Boiling Point: | 3650 °C |
| Solubility: | soluble in water |
| Appearance: | charcoal-grey pieces or black powder |
| Hazard Symbols: |
 Xn;  F
|
| Risk Codes: | 11-22-62-63 |
| Safety: | 16-24/25-26-27-45-36/37/39 |
| Transport Information: | UN 3178 4.1/PG 2 |
| PSA: | 0.00000 |
| LogP: | -1.18390 |
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| Conditions | Yield |
|---|---|
| In gaseous matrix Irradiation (UV/VIS); laser oblated B atoms and H2 in excess neon during condensation at 3.5 K(laser oblatation using 10-40 mJ of 1064 nm laser energy per 10 ns puls e); annealed; irradiated (mercury ars lamp); not isolated; monitored by IR; |
| Conditions | Yield |
|---|---|
| In not given other Radiation; radiolysis ((60)Co γ-rays, 77 K); not isolated, detd. by ESR spectroscopy; |
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- 7440-42-8
borohydride radical
| Conditions | Yield |
|---|---|
| With sodium azide; dinitrogen monoxide In water Kinetics; other Radiation; N2O satd. soln. of NaN3 and NaBH4 at pH 11.1 (molar ratio 200:3), pulse radiolysis; |
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History
The name of Boron (CAS NO.7440-42-8) originates from the Arabic word buraq or the Persian word burah; which are names for the mineral borax.
Boron(7440-42-8) compounds were known thousands of years ago. Borax was known from the deserts of western Tibet, where it received the name of tincal, derived from the Sanskrit. Borax glazes were used in China from AD300, and some tincal even reached the West, where the Arabic alchemist Geber seems to mention it in 700. Marco Polo brought some glazes back to Italy in the 13th century. Agricola, around 1600, reports its use as a flux in metallurgy. In 1777, boric acid was recognized in the hot springs (soffioni) near Florence, Italy, and became known as sal sedativum, with mainly medical uses. The rare mineral is called sassolite, which is found at Sasso, Italy. This was the main source of European borax from 1827 to 1872, at which date American sources replaced it.
Boron was not recognized as an element until it was isolated by Sir Humphry Davy, Joseph Louis Gay-Lussac and Louis Jacques Thénard in 1808 through the reaction of boric acid and potassium. Davy called the element boracium. Jons Jakob Berzelius identified boron as an element in 1824. The first pure boron was arguably produced by the American chemist W. Weintraub in 1909.
Consensus Reports
Reported in EPA TSCA Inventory.
Specification
The Boron, with its CAS registry number 7440-42-8, is a kind of charcoal-grey pieces or black powder. For being stable chemically, this chemical could react with strong oxidizing agents and strong acids and it may decompose on exposure to air. In addition, its product categories are including Industrial/Fine Chemicals; Inorganics; Boron; Catalysis and Inorganic Chemistry; Chemical Synthesis; Electronic Chemicals; Micro/Nanoelectronics; Pure Elements.
The characteristics of this chemical are as below: (1)#H bond acceptors: 0 ; (2)#H bond donors: 0 ; (3)#Freely Rotating Bonds: 0 ; (4)Polar Surface Area: 0; (5)Exact Mass: 11.009305; (6)MonoIsotopic Mass: 11.009305; (7)Heavy Atom Count: 1; (8)Covalently-Bonded Unit Count: 1.
The production method of this chemical is below: Prepare the raw material of boron chloride, and then have the hydrogen reduction reaction in the gaseous phase when heated at 800℃ to have this product. When comes to its usage, it is widely applied in many ways. When used in smelting, it could be used as the scavenger in the air of moltencopper and also in the smelt of some special alloy steel; When used in atomics, it could be used as the control rod of atomic reactor and the rocket fuel; When in electronic industry, it could be used the ignitor of ignition rectifier; Then it could be applied as the catalytic agent in pharmaceutics, ceramic industry and organic synthesis.
When you are dealing with this chemical, you should be more cautious. For one thing, it is harmful which may cause damage to health. And it may have possible risk of impaired fertility and risk of harm to the unborn child; For another thing, it is highly flammable which may catch fire in contact with air, only needing brief contact with an ignition source, and it has a very low flash point or evolve highly flammable gases in contact with water.
Therefore, you should wear suitable protective clothing, gloves and eye/face protection. If in case of contact with eyes, rinse immediately with plenty of water and seek medical advice, and if in case of accident or if you feel unwell seek medical advice immediately (show the label where possible). Then you should avoid contacting with skin and eyes and take off immediately all contaminated clothing after using. When store it, keep it away from sources of ignition - No smoking.
In adddition, you could convert the following datas into the molecular structure:
(1)Canonical SMILES: [B]
(2)InChI: InChI=1S/B
(3)InChIKey: ZOXJGFHDIHLPTG-UHFFFAOYSA-N
Below are the toxicity information of this chemical:
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| cat | LD50 | oral | 250mg/kg (250mg/kg) | Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 35(11), Pg. 11, 1970. | |
| dog | LD50 | oral | 310mg/kg (310mg/kg) | Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 35(11), Pg. 11, 1970. | |
| guinea pig | LD50 | oral | 310mg/kg (310mg/kg) | Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 35(11), Pg. 11, 1970. | |
| mammal (species unspecified) | LD50 | oral | 300mg/kg (300mg/kg) | Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 40(9), Pg. 49, 1975. | |
| mouse | LD50 | intraperitoneal | 11gm/kg (11000mg/kg) | Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 35(2), Pg. 42, 1991. | |
| mouse | LD50 | oral | 560mg/kg (560mg/kg) | Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 35(11), Pg. 11, 1970. | |
| rabbit | LD50 | oral | 310mg/kg (310mg/kg) | Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 35(11), Pg. 11, 1970. | |
| rat | LD50 | intraperitoneal | 7gm/kg (7000mg/kg) | Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 35(2), Pg. 42, 1991. | |
| rat | LD50 | oral | 650mg/kg (650mg/kg) | Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 35(11), Pg. 11, 1970. |