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I am preparing for chemistry olympiad and I am stuck nitrito-O and nitrito-N. Can anyone explain difference between the structure of nitrito-O and nitrito-N or point a resource which is suitable for a beginner?

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The last letter of nitrite-O and nitrite-N depicts the atom which is attached to the other atom. This phenomenon is called linkage isomerism and is an important concept in both organic and inorganic chemistry.

Inorganic chemistry

pentaamminenitrito-N-cobalt(III)

This complex exhibits linkage isomerism which results in two possible ways of attachment of ligand to the central atom. First one, the $\ce{NO2}$ ligates with (attaches to) the central atom through the nitrogen atom and thus is called pentaamminenitrito-N-cobalt(III) chloride and the second one, $\ce{NO2}$ ligates with the central atom through the oxygen atom and thus is called pentaamminenitrito-O-cobalt(III) chloride. In this case, $\ce{NO2}$ is called ambident ligand and is represented as nitrito-κ-N and nitrito-κ-O, replacing the old system of trivial names such as nitro and nitroso.

Organic chemistry

Alkyl nitrite forms two isomers: $\ce{RNO2}$ (called alkyl nitrite-N) and $\ce{R-O-N=O}$ (called alkyl nitrite-O).For preparation of these two isomers, see Reaction of an alkyl halide with silver nitrite.

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