Why C=O in concentrated/pure aliphatic carboxylic acid appear at lower stretching frequency (1710 cm-1) than dilute solution (1760 cm-1)?

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Why C=O in concentrated/pure aliphatic carboxylic acid appear at lower stretching frequency (1710 cm-1) than dilute solution (1760 cm-1)? 

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The intermolecular forces like hydrogen bonds effects the IR absorption frequencies functional groups which can involve in hydrogen bonding.

Frequency(ν)=12πkμhere, frequency and force constant(k) are directly proportional to each other.

The hydrogen bonding interactions decreases the bond strength, which further decreases the force constant and IR adsorption frequency.

 

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