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Chemistry

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Analytical Chemistry

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Molecular Vibrational Spectroscopy

IR Peak Splitting in Amines and Nitro Groups

Description

IR peak splitting can reveal how identical bonds in a polyatomic group are moving. These bonds may stretch in phase, which is symmetric stretching, or out of phase, which is asymmetric stretching. The two motions often create different IR peak shapes and positions.

As a general rule, asymmetric s...

Transcript

Ricordiamo che un gruppo poliatomico che porta un minimo di due atomi identici può allungarsi simmetricamente o asimmetricamente.

Quindi, i due legami N-H di RNH2 si allungano in fase come allungamento simmetrico, o fuori fase esibendo un allungamento asimmetrico.

Pertanto, RNH2 dà origine a due picchi IR dist...

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