generation of nitronium ion by different methods
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Answers
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ANSWER:-
The nitronium ion, NO+2, is a cation. It is an onium ion because of its tetravalent nitrogen atom and +1 charge, similar in that regard to ammonium. It is created by the removal of an electron from the paramagnetic nitrogen dioxide molecule, or the protonation of nitric acid (with removal of HO).
Structure
The nitronium ion is isoelectronic with carbon dioxide and nitrous oxide, and has the same linear structure and bond angle of 180°. For this reason it has a similar vibrational spectrum to carbon dioxide. Historically, the nitronium ion was detected by Raman spectroscopy, because its symmetric stretch is Raman-active but infrared-inactive. The Raman-active symmetrical stretch was first used to identify the ion in nitrating mixtures.
Salts
A few stable nitronium salts with anions of weak nucleophilicity can be isolated. These include nitronium perchlorate (NO+ClO−), nitronium tetrafluoroborate (NO+BF−), nitronium hexafluorophosphate (NO+PF−), nitronium hexafluoroarsenate (NO+AsF−), and nitronium hexafluoroantimonate (NO+SbF−). These are all very hygroscopic compounds.
The solid form of dinitrogen pentoxide, NO, actually consists of nitronium and nitrate ions, so it is an ionic compound, [NO+][NO−], not a molecular solid. However, dinitrogen pentoxide in liquid or gaseous state is molecular and does not contain nitronium ions.
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