Hydrogen bonds in amines

For hydrates, the question is, to what extent does the nitrogen atom lone pair contribute to hydrogen bonding in amine hydrates Hydrogen bonding is expected to explain the difference between gaseous and solid ammonia couplings. 

Hydrogen bonding In amines modifies both symmetric and antisymmetric N—H str bands. In dilute solutions free N—H str can be seen near 3500 cm. N—H def occurs around 1600 cm. ... 

As with other hydrogen bonded compounds, stronger hydrogen bonding in amine salts (I < Br" < Cl ) lowers hydrogen stretching frequencies but raises deformation frequencies (and their overtones). 

Amines have lower boiling points than alcohols because nitrogen is less electronegative than oxygen. As a result the N—H bond is less polar than the O—H bond, and the N—H—N hydrogen bond in amines is weaker than the O—H—O hydrogen bond in alcohols. 

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