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What is a hydrogen bond?
Precise definition of a hydrogen bond is still elusive!1
Several criteria are listed usually for X-H•••Y, X and Y initially thought to be F, O and N only1
- The X-Y bond length is less than the sum of their van der Waals radii.
- X-H•••Y is linear
- (Microwave Spectroscopy can help in verifying both and the results challenge both these conventional wisdom as a criteria for H bonding)