7440-42-8

Basic information

• Product Name: Boron
• Synonyms: Boron powder, crystalline, -4+40 mesh, Puratronic, 99.9999% (metals basis);Boron powder, crystalline (99.5%);Boron, amorphous powder -325 mesh 90%;Boron 99.99%;3-(1-Methylethyl)-2,1,3-benzothiadiazin-4(3H)-one-13C6 2,2-Dioxide;3,4-Dihydro-3-isopropyl-1H-2,1,3-benzothiadiazin-4-one-13C6 2,2-Dioxide;3-Isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one-13C6 2,2-Dioxide;Basagran 480-13C6
• CAS NO: 7440-42-8
• Molecular Formula: BH₄
• Molecular Weight: 10.81
• EINECS: 231-151-2
• Product Categories: metal or element;Industrial/Fine Chemicals;Inorganics;Boron;Catalysis and Inorganic Chemistry;Chemical Synthesis;Electronic Chemicals;Micro/Nanoelectronics;Pure Elements
• Mol File: 7440-42-8.mol
• Article Data: 3

Chemical Properties

• Melting Point: 2300°C
• Boiling Point: 2550°C
• Appearance: Dark gray/pieces
• Density: 2.34 g/mL at 25 °C(lit.)
• Storage Temp.: Storage temperature: no restrictions.
• Solubility: H2O: soluble
• Water Solubility: insoluble H2O [MER06]
• Stability: Stable. Substances to be avoided include strong oxidizing agents and strong acids. May decompose on exposure to air - store unde
• Merck: 13,1333
• CAS DataBase Reference: Boron(CAS DataBase Reference)
• NIST Chemistry Reference: Boron(7440-42-8)
• EPA Substance Registry System: Boron(7440-42-8)

Safety Data

• Hazard Codes: Xn,F
• Statements: 22-11-63-62
• Safety Statements: 16-24/25-45-36/37/39-27-26
• RIDADR: UN 3178 4.1/PG 2
• RTECS: ED7350000
• TSCA: Yes
• HazardClass: 4.1
• PackingGroup: III
• Hazardous Substances Data: 7440-42-8(Hazardous Substances Data)

Usage

Chemical Description

Boron is used in these molecules due to its strong electron-withdrawing characteristic.

InChI:InChI=1/B

Synthetic route

boron + hydrogen (1333-74-0) → borohydride radical (7440-42-8) + borohydride + diborane (19287-45-7)

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;

sodium tetrahydroborate (16940-66-2) → borohydride radical (7440-42-8) + borane(1-)

Conditions	Yield
In not given other Radiation; radiolysis ((60)Co γ-rays, 77 K); not isolated, detd. by ESR spectroscopy;

sodium tetrahydroborate (16940-66-2) → borohydride radical (7440-42-8)

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;

Upstream product

• 1333-74-0 hydrogen 
• 16940-66-2 sodium tetrahydroborate 

Relevant articles and documents

The .BH4 Radical: an Electron Spin Resonance Study of the Radiolysis of NaBH4

Exposure of NaBH4(NaBD4) to 60Co γ-rays at 77 K gave a species having a large proton hyperfine coupling to two equivalent protons (deuterons), and a small coupling to two other protons (deuterons), together with a strongly anisotropic coupling to 11B.

Oxidation Intermediates of Borohydride and Tetraphenylborate Ions in Aqueous Solutions obtained by Pulse Radiolysis

Absorption spectra of one-electron oxidized intermediates (the H4B and the Ph4B radicals) were observed upon the oxidation of H4B(1-) and Ph4B(1-) by the azide radical (N3), Br2(1-), or (SCN)2(1-) in pulse-irradiated solutions; the spectra