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Cyanate
Cyanate is an anion with the structural formula , usually written . It also refers to any salt containing it, such as ammonium cyanate. It is an isomer of the much less stable fulminate anion .William R. Martin and David W. Ball (2019): "Small organic fulminates as high energy materials. Fulminates of acetylene, ethylene, and allene". ''Journal of Energetic Materials'', volume 31, issue 7, pages 70-79. A cyanate ester is an organic compound containing the cyanate group. The cyanate ion is an ambidentate ligand, forming complexes with a metal ion in which either the nitrogen or oxygen atom may be the electron-pair donor. It can also act as a bridging ligand. Cyanate ion The three atoms in a cyanate ion lie on a straight line, giving the ion a linear structure. The electronic structure is described most simply as : :Ö̤−C≡N: with a single C−O bond and a triple C≡N bond. The infrared spectrum of a cyanate salt has a band at ca. 2096 cm−1; such a high frequen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyanate Ester
In chemistry, cyanate esters are chemical substances in which the hydrogen atom of the phenolic OH group is substituted by a cyanide group (). The resulting product with a cyanate group is termed a cyanate ester. Cyanate esters based on a bisphenol or novolac derivative are used in the production of resins. Use in resins Cyanate esters can be cured and postcured by heating, either alone at elevated temperatures or at lower temperatures in presence of a suitable catalyst. The most common catalysts are transition metal complexes of cobalt, copper, manganese and zinc. The result is a thermoset material with a very high glass-transition temperature (Tg) of up to 400 °C, and a very low dielectric constant, providing excellent long term thermal stability at elevated end use temperatures, very good fire, smoke and toxicity performance and specific suitability for printed circuit boards installed in critical electrical devices. This is also due to its low moisture uptake. This p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sodium Cyanate
Sodium cyanate (NaOCN) is a white crystalline solid that adopts a body centered rhombohedral crystal lattice structure (trigonal crystal system) at room temperature. Preparation Sodium cyanate is prepared industrially by the reaction of urea with sodium carbonate at elevated temperature. :2OC(NH2)2 + Na2CO3 → 2Na(NCO) + CO2 + 2NH3 + H2O It can also be prepared in the laboratory by oxidation of a cyanide in aqueous solution by a mild oxidizing agent such as lead oxide. Chemical Uses Sodium cyanate is an ideal nucleophile, and these nucleophilic properties make it a major contributor to the stereospecificity in certain reactions such as in the production of chiral oxazolidone. Medical applications Sodium cyanate is a useful reagent in producing asymmetrical urea derivatives that have a range of biological activity mostly in aryl isocyanate intermediates. Such intermediates as well as sodium cyanate have been used in medicine as a means of counterbalancing carcinogenic effects o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Functional Group
In organic chemistry, a functional group is a substituent or moiety in a molecule that causes the molecule's characteristic chemical reactions. The same functional group will undergo the same or similar chemical reactions regardless of the rest of the molecule's composition. This enables systematic prediction of chemical reactions and behavior of chemical compounds and the design of chemical synthesis. The reactivity of a functional group can be modified by other functional groups nearby. Functional group interconversion can be used in retrosynthetic analysis to plan organic synthesis. A functional group is a group of atoms in a molecule with distinctive chemical properties, regardless of the other atoms in the molecule. The atoms in a functional group are linked to each other and to the rest of the molecule by covalent bonds. For repeating units of polymers, functional groups attach to their nonpolar core of carbon atoms and thus add chemical character to carbon chains. Fun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potassium Cyanate
Potassium cyanate is an inorganic compound with the formula KOCN (sometimes denoted KCNO). It is a colourless solid. It is used to prepare many other compounds including useful herbicide. Worldwide production of the potassium and sodium salts was 20,000 tons in 2006.Peter M. Schalke1, "Cyanates, Inorganic Salts" Ullmann's Encyclopedia of Industrial Chemistry2006, Wiley-VCH, Weinheim. . Article Online Posting Date: July 15, 2006 Structure and bonding The cyanate anion is isoelectronic with carbon dioxide and with the azide anion, being linear. The C-N distance is 121 pm, about 5 pm longer than for cyanide. Potassium cyanate is isostructural with potassium azide. Uses For most applications, the potassium and sodium salts can be used interchangeably. Potassium cyanate is often preferred to the sodium salt, which is less soluble in water and less readily available in pure form. Potassium cyanate is used as a basic raw material for various organic syntheses, including, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver Cyanate
Silver cyanate is the cyanate salt of silver. It can be made by the reaction of potassium cyanate with silver nitrate in aqueous solution, from which it precipitates as a solid. : + \rarr + + Alternatively, the reaction : + \rarr + analogous to the reaction used for the industrial production of sodium cyanate, may be used. Silver cyanate is a beige to gray powder. It crystallises in the monoclinic crystal system in space group ''P''21/''m'' with parameters a = 547.3 pm, b = 637.2 pm, c = 341.6 pm, and β = 91°. Each unit cell contains two cyanate ions and two silver ions. The silver ions are each equidistant from two nitrogen atoms forming a straight N-Ag-N group. The nitrogen atoms are each coordinated to two silver atoms, so that there are zigzag chains of alternating silver and nitrogen atoms going in the direction of the monoclinic "b" axis, with the cyanate ions perpendicular to that axis. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
