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Boron Monoxide
Boron monoxide (BO) is a binary compound of boron and oxygen. It has a molar mass of 26.81 g/mol. The material was first reported in 1940, with a modified synthetic procedure published in 1955, however, the material's structure had remained unknown for nearly a century. A number of allotropes of BO have been theorized ranging from molecular species, to 1D, 2D, and 3D-structured materials, but these were difficult to differentiate using common structural characterization methods. Recent work suggests that the material forms 2D nanosheets composed of O-bridged B4O2 rings, a structure initially postulated in 1961. Due to the lack of precise structural information on the identity of the compound, it has not found widespread use in industry. Synthesis Boron monoxide is typically produced through the condensation of tetrahydroxydiboron (chemical formula; B2(OH)4) at temperatures of 200–500°C. The use of higher temperatures (700°C) leads to the formation of hard B2O3 glasses. Thes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrahydroxydiboron
Tetrahydroxydiboron is a chemical reagent which can be used to prepare boronic acids. Synthesis The reaction of boron trichloride with alcohols was reported in 1931, and was used to prepare dimethoxyboron chloride, B(OCH3)2Cl. Egon Wiberg and Wilhelm Ruschmann used it to prepare tetrahydroxydiboron by first introducing the boron–boron bond by reduction with sodium and then hydrolysing the resulting tetramethoxydiboron, B2(OCH3)4, to produce what they termed sub-boric acid. The methanol used in this process can be recycled: ::BCl3 -> text \ce- \text \ce] B(OCH3)2Cl -> text \ce- \text \ce] B2(OCH3)4 -> text \ce- \text \ce] B2(OH)4 Overall: 2 boron trichloride, BCl3 + 2 Na + 4 H2O → B2(OH)4 + 2 NaCl Sodium chloride , commonly known as edible salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. It is tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BO Crystal Structure
Bo or BO may refer to Arts and entertainment *Box office, where tickets to an event are sold, and by extension, the amount of business a production receives *'' BA:BO'', 2008 South Korean film * ''Bo'' (film), a Belgian film starring Ella-June Henrard and directed by Hans Herbots * Bo (instrument), a Chinese cymbal * Bo, a Greek rapper *'' Bō: Path of the Teal Lotus'', a platform game *'' Call of Duty: Black Ops'', a first-person shooter video game *'' Blood Omen: Legacy of Kain'', first in the ''Legacy of Kain'' video game series People *Bo (given name), name origin, plus a list of people and fictional characters with the name or nickname * Bo (surname), name origin, plus a list of people with the surname ** Bo (Chinese surname), Chinese family names ** Bő (genus), Hungarian medieval noble clan *Bø (other), which includes several people with the surname *Bo people (China), a nearly extinct minority population in Southern China *Bo people of Laos, see List of ethni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boron
Boron is a chemical element; it has symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the boron group it has three valence electrons for forming covalent bonds, resulting in many compounds such as boric acid, the mineral sodium borate, and the ultra-hard crystals of boron carbide and boron nitride. Boron is synthesized entirely by cosmic ray spallation and supernovas and not by stellar nucleosynthesis, so it is a low-abundance element in the Solar System and in the Earth's crust. It constitutes about 0.001 percent by weight of Earth's crust. It is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals. These are mined industrially as evaporites, such as borax and kernite. The largest known deposits are in Turkey, the largest producer of boron minerals. Elemental boron is found in smal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diboron Tetrachloride
Diboron tetrachloride is a tetrahalodiborane chemical compound with the formula B2Cl4. It is a colorless liquid. Synthesis The modern synthesis involves the chlorination of diboron tetrabromide by gallium(III) chloride. It can also be formed by the electrical discharge procedure of boron trichloride at low temperatures: :BCl3 → BCl2 + Cl :Cl + Hg (electrode) → Hg2Cl2 or HgCl2 :2 BCl2 → B2Cl4 The most efficient synthesis technique uses no dechlorinating metal, instead passing radio-frequency AC current through gaseous boron trichloride. Structure The molecular structure of diboron tetrachloride, B2Cl4, was determined by gas electron diffraction. The molecules have ''D''2d symmetry, i.e. the two planar BBCl2 units are perpendicular to each other (torsion angle Cl-B-B-Cl 90°). The B-B distance is 1.70(4) Å, the B-Cl distance is 1.750(5) Å, the Cl-B-Cl angle is 118.7(3)°. B2Cl4 thus differs significantly from B2F4, which is a planar molecule overall. Reactions The co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boron Suboxide
Boron suboxide (chemical formula B6O) is a solid compound with a structure built of eight icosahedra at the apexes of the rhombohedral unit cell. Each icosahedron is composed of twelve boron atoms. Two oxygen atoms are located in the interstices along the 11rhombohedral direction. Due to its short interatomic bond lengths and strongly covalent character, B6O displays a range of outstanding physical and chemical properties such as great hardness (close to that of rhenium diboride and boron nitride), low mass density, high thermal conductivity, high chemical inertness, and excellent wear resistance. and references therein B6O can be synthesized by reducing B2O3 with boron or by oxidation of boron with zinc oxide or other oxidants. These boron suboxide materials formed at or near ambient pressure are generally oxygen deficient and non- stoichiometric (B6Ox, x<0.9) and have poor crystallinity and very small grain size (less than 5 μm). High pressure applied during the synthe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boron Trioxide
Boron trioxide or diboron trioxide is the oxide of boron with the formula . It is a colorless transparent solid, almost always glassy (amorphous), which can be crystallized only with great difficulty. It is also called boric oxide or boria. It has many important industrial applications, chiefly in ceramics as a flux for glazes and enamels and in the production of glasses. Structure Boron trioxide has three known forms, one amorphous and two crystalline. Amorphous form The amorphous form (g-) is by far the most common. It is thought to be composed of boroxol rings which are six-membered rings composed of alternating 3-coordinate boron and 2-coordinate oxygen. Because of the difficulty of building disordered models at the correct density with many boroxol rings, this view was initially controversial, but such models have recently been constructed and exhibit properties in excellent agreement with experiment. It is now recognized, from experimental and theoretical studies, that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boron
Boron is a chemical element; it has symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the boron group it has three valence electrons for forming covalent bonds, resulting in many compounds such as boric acid, the mineral sodium borate, and the ultra-hard crystals of boron carbide and boron nitride. Boron is synthesized entirely by cosmic ray spallation and supernovas and not by stellar nucleosynthesis, so it is a low-abundance element in the Solar System and in the Earth's crust. It constitutes about 0.001 percent by weight of Earth's crust. It is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals. These are mined industrially as evaporites, such as borax and kernite. The largest known deposits are in Turkey, the largest producer of boron minerals. Elemental boron is found in smal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boron Compounds
Boron compounds are compounds containing the element boron. In the most familiar compounds, boron has the formal oxidation state +3. These include oxides, sulfides, nitrides, and halides. Halides The trihalides adopt a planar trigonal structure. These compounds are Lewis acids in that they readily form adducts with electron-pair donors, which are called Lewis bases. For example, fluoride (F−) and boron trifluoride (BF3) combined to give the tetrafluoroborate anion, BF4−. Boron trifluoride is used in the petrochemical industry as a catalyst. The halides react with water to form boric acid. Oxygen compounds Boron is found in nature on Earth almost entirely as various oxides of B(III), often associated with other elements. More than one hundred borate minerals contain boron in oxidation state +3. These minerals resemble silicates in some respect, although boron is often found not only in a tetrahedral coordination with oxygen, but also in a trigonal planar configuration. Unlik ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
