维基上的二氰二胺(双氰胺)

2-CyanoguanidineFrom Wikipedia, the free encyclopedia(Redirected fromCyanoguanidine)2-Cyanoguanidineis annitrilederived fromguanidine. It is adimerofcyanamide, from which it can be prepared. 2-Cyanoguanidine is a colourless solid that is soluble inwater,acetone, andalcohol, but not indiethyl etherorchloroform.1Production and use2-Cyanoguanidine is produced by treating cyanamide with base. It is produced in soil by decomposition of cyanamide. A variety of useful compounds are produced from 2-cyanoguanidine,guanidinesandmelamine. It is also used as a slowfertilizer. Formerly, it was as a fuel in some explosives. It is used in the adhesive industry as a curing agent for epoxies.Tautomers and saltsIt is possible to draw a tautomer of 2-cyanoguanidine with the structure NC-NH-C(NH)NH2. Further tautomerization gives NC-NH-C(N-)NH3+. Formal loss of neutral ammonia (NH3) from this latter tautomer followed by deprotonation gives the anion commonly referred to the dicyanamide ion, (NC)2N-. The dicyanamide ion has been used extensively as a counterion in the chemistry of organic and inorganic salts, for example in the synthesis of what was, in 1990, a superconductor with novel properties2where we can see the anion depicted as N(CN)2-.References1. Thomas Guthner; Bernd Mertschenk (2006). Cyanamides.Ullmanns Encyclopedia of Industrial Chemistry. Weinheim:Wiley-VCH.doi:10.1002/14356007.a08_139.pub2.2. A new ambient-pressure organic superconductor, -(ET)2CuN(CN)2Br, with the highest transition temperature yet observed (inductive onset Tc= 11.6 K, ., AM Kini, U Geiser, HH Wang, KD Carlson ., Inorganic Chemistry1990,29, 2555-2557.Other namesCyanoguanidine, dicyanodiamide, N-cyanoguanidine, 1-cyanoguanidine, Guanidine-1-carbonitrile, dicyandiamin, Didin, DCD, DicyIdentifiersCAS number461-58-5PubChem10005ChemSpider9611EC number207-312-8RTECS numberME9950000Jmol-3D imagesImage 1PropertiesMolecular formulaC2H4N4Molar mass84.08 g/molAppearanceWhite crystalsDensity1.400 g/cm3Melting point209.5 CBoiling point252 CSolubilityinwater41.3 g/llog P-0.52kH2.2510-10atm.m/molHazardsR-phrasesR20/21/22S-phrasesS24/25Mainhazardsharmful (Xn)