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hydrogen bond

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hydrogen bond [′hī·drə·jən ′bänd]
(physical chemistry)
A type of bond formed when a hydrogen atom bonded to atom A in one molecule makes an additional bond to atom B either in the same or another molecule; the strongest hydrogen bonds are formed when A and B are highly electronegative atoms, such as fluorine, oxygen, or nitrogen.


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Presumably, the shifting of the hydrogen-bonded N-H, C=O, and O-H stretching bands into higher frequencies and the decrease in [DELTA][nu] can be attributed to the gradually weakened hydrogen bonds between the amide/carbonyl groups and hydroxyl groups present in the PA6 and PVA molecules, respectively, and hence, cause the absorption band of the free amide, carbonyl, and hydroxyl groups to become more pronounced.
Most of these "anomalous" properties of water--which are by no means mysterious, unpredictable, or abnormal--depend on the extremely weak hydrogen bonding, so weak that a hydrogen bond does not survive for more than a tiny fraction of a second.
Hydrogen Bonds Like most chemical bonds, the bindings on our hairs are actually invisible to the naked eye.
 
 
 
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