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|Section2= |Section3= |Section4= |Section7= |Section8= }} Dinitrogen tetroxide, commonly referred to as nitrogen tetroxide, is the chemical compound N2O4. It is a useful reagent in chemical synthesis. It forms an equilibrium mixture with nitrogen dioxide. Dinitrogen tetroxide is a powerful oxidizer that is hypergolic (spontaneously reacts) upon contact with various forms of hydrazine, which makes the pair a popular bipropellant for rockets. ==Structure and properties== Dinitrogen tetroxide forms an equilibrium mixture with nitrogen dioxide.〔Henry A. Bent (''Dimers of Nitrogen Dioxide. II. Structure and Bonding'' ) Inorg. Chem., 1963, 2 (4), pp 747–752〕 The molecule is planar with an N-N bond distance of 1.78 Å and N-O distances of 1.19 Å. The N-N distance corresponds to a weak bond, since it is significantly longer than the average N-N single bond length of 1.45 Å.〔R.H. Petrucci, W.S. Harwood and F.G. Herring ''General Chemistry'' (8th ed., Prentice-Hall 2002), p.420〕 Unlike NO2, N2O4 is diamagnetic since it has no unpaired electrons.〔Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.〕 The liquid is also colorless but can appear as a brownish yellow liquid due to the presence of NO2 according to the following equilibrium: :N2O4 (unicode:⇌) 2 NO2 Higher temperatures push the equilibrium towards nitrogen dioxide. Inevitably, some dinitrogen tetroxide is a component of smog containing nitrogen dioxide. 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「Dinitrogen tetroxide」の詳細全文を読む スポンサード リンク
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