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}} }} A hyponitrite refers to ionic compounds that contain the hyponitrite ion, N2O22−, (()2−) or to organic hyponitrites (RON=NOR), for example di-tert butyl hyponitrite. ==Hyponitrite ion== There are ''cis'' and ''trans'' forms of the hyponitrite ion.〔Egon Wiberg, Arnold Frederick Holleman (2001) ''Inorganic Chemistry'', Elsevier ISBN 0-12-352651-5〕 The ''trans'' form is generally found in hyponitrite salts such as sodium hyponitrite, Na2N2O2 and silver hyponitrite, Ag2N2O2. The trans-isomer is conventionally prepared by nitrite reduction with sodium amalgam. Sodium hyponitrite can be prepared from sodium and nitric oxide by a method described by an earlier method modified with pyridine, from sodium amalgam and sodium nitrite, from alkyl nitrites and hydroxylamine or by electrolysis of sodium nitrite.〔Polydoropoulos, C. N. Chem. Ind. (London) 1963, 1686 and references therein.〕 The ''cis''-isomer of the sodium salt, NaN2O2, can be prepared by passing nitrous oxide, NO into a solution of sodium metal in liquid ammonia at −50 °C.〔The ''cis'' salt is more reactive than the ''trans''. The ''trans'' - hyponitrite ion is a salt of the related ''trans''-hyponitrous acid H2N2O2 ( HON=NOH ), the ''cis'' acid is not known.〔 The hyponitrite ions can act as a bidentate ligand in either bridging or chelating mode. There is a bridging ''cis''-hyponitrite group in the red dinuclear form of nitrosyl pentammine cobalt(III) chloride, ()Cl2. Hyponitrite can act as a reducing agent for example reducing iodine, I2,:〔 :N2O22− + 3I2 + 3H2O = ()− + ()− + 6HI Liquid N2O4 oxidises hyponitrites to give Na2N2O3, sodium peroxohyponitrite (containing ()2−).〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hyponitrite」の詳細全文を読む スポンサード リンク
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