Chemistry help

tedibare

17

This is on the topic about infrared frequency
How would you define resonance frequency of a molecular bond?

Reply 1

Jingonator

11

Original post by tedibare

This is on the topic about infrared frequency
How would you define resonance frequency of a molecular bond?

"In chemistry, resonance is a way of describing bonding in certain molecules or ions by the combination of several contributing structures (or forms, also variously known as resonance structures or canonical structures) into a resonance hybrid (or hybrid structure) in valence bond theory."

Reply 2

tedibare

OP

17

Original post by Jingonator

"In chemistry, resonance is a way of describing bonding in certain molecules or ions by the combination of several contributing structures (or forms, also variously known as resonance structures or canonical structures) into a resonance hybrid (or hybrid structure) in valence bond theory."

Thanks!

Reply 3

Davies Chemistry

9

Original post by Jingonator

"In chemistry, resonance is a way of describing bonding in certain molecules or ions by the combination of several contributing structures (or forms, also variously known as resonance structures or canonical structures) into a resonance hybrid (or hybrid structure) in valence bond theory."

This is a different use of the word "resonance".

In the case of IR spectroscopy, the resonance frequency is just the frequency of IR radiation (usually quoted in the unusual units of cm-1 rather than the usual Hertz) that a particular bon absorbs at. e.g. for most C=O bonds it is about 1745 cm-1, for C-h bonds about 3000cm-1 etc etc

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