cyano group


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cyano group

(sī`ənō, sī-ăn`ō), in chemistry, functional groupfunctional group,
in organic chemistry, group of atoms within a molecule that is responsible for certain properties of the molecule and reactions in which it takes part. Organic compounds are frequently classified according to the functional group or groups they contain.
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 that consists of a carbon atom joined to a nitrogen atom by a triple bond; it can be joined to an atom or another group by a single bond to the carbon atom. When a cyano group is joined to hydrogen, it forms hydrogen cyanidehydrogen cyanide,
HCN, colorless, volatile, and extremely poisonous chemical compound whose vapors have a bitter almond odor. It melts at −14°C; and boils at 26°C;. It is miscible in all proportions with water or ethanol and is soluble in ether.
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. When it is joined to a metal, it forms a metal cyanidecyanide
, chemical compound containing the cyano group, -CN. Cyanides are salts or esters of hydrogen cyanide (hydrocyanic acid, HCN) formed by replacing the hydrogen with a metal (e.g., sodium or potassium) or a radical (e.g., ammonium or ethyl).
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. When it is joined to an alkyl groupalkyl group
, in chemistry, group of carbon and hydrogen atoms derived from an alkane molecule by removing one hydrogen atom (see radical). The name of the alkyl group is derived from the name of its alkane by replacing the -ane suffix with -yl, e.g.
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 or aryl grouparyl group
, in chemistry, group of atoms derived from benzene or from a benzene derivative by removing one hydrogen that is bonded to the benzene ring (see radical). The simplest aryl group is phenyl, C6H5 ; it is derived from benzene.
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, it forms a nitrile. When two cyano groups are joined directly to one another, they form the cyanogencyanogen
, NCCN, colorless, flammable, extremely poisonous gas with a characteristic odor somewhat like that of hydrogen cyanide. It melts at −35°C;, boils at −21°C;, and is soluble in water, ethanol, or ether. It is chemically very active.
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 molecule, NCCN. Both the cyano group and hydrogen cyanide have been found in interstellar space.
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References in periodicals archive ?
Polymerization occurs through the cyano groups on phthalonitrile units by an addition mechanism to afford the heterocyclic cross-linked products such as polytriazine, polyimine, and polyphthalocyanine, which ensures that these materials possess excellent thermal and oxidative stability [2, 11-13].
25] synthesized poly(phthalazinone ether amide)s with terminal cyano groups.
The good solubility might be resulted from the incorporation of DFBN containing lateral cyano group into the oligomer main chain, which disordered the packing of the intermolecular chain and therefore made the synthesized oligomers organically soluble.
FTIR indicated, with the curing reaction progressed, the amount of cyano group decreased distinctly while the new structures such as phthalocyanine ring and triazine ring had formed.
It is supposed that chelating effects of Ag ions and Ag nucleus with cyano groups in PAN polymer and phenolic hydroxyls in TP molecules play a crucial role in the synthesis of AgNPs in PAN nanofibers, which will be proved by X-ray photoelectron spectroscopy (XPS) results and discussed later.
However, it is clear that in the P1 structure the intermolecular distance between the cyano groups in neighbouring molecules in the [011] direction is too short (2.
Also, such enhancement took place by the electron-withdrawing groups as halogen in an aniline nucleus like sulfo, carboxyl, acyl, or cyano groups (14-20).
This suggests that the C[equivalent]N triple bonds in the monomers are very reactive in the plasma process and are much more subject to cleavage than those without cyano groups.