4.1 Review

The Hydrogen Bond: A Hundred Years and Counting

Journal

JOURNAL OF THE INDIAN INSTITUTE OF SCIENCE
Volume 100, Issue 1, Pages 61-76

Publisher

SPRINGER
DOI: 10.1007/s41745-019-00142-8

Keywords

Halogen bond; Chalcogen bond; Pnicogen bond; Tetrel bond; Excited-state proton transfer; CH center dot center dot center dot O H-bond

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Since its original inception, a great deal has been learned about the nature, properties, and applications of the H-bond. This review summarizes some of the unexpected paths that inquiry into this phenomenon has taken researchers. The transfer of the bridging proton from one molecule to another can occur not only in the ground electronic state, but also in various excited states. Study of the latter process has developed insights into the relationships between the nature of the state, the strength of the H-bond, and the height of the transfer barrier. The enormous broadening of the range of atoms that can act as both proton donor and acceptor has led to the concept of the CH center dot center dot center dot O HB, whose properties are of immense importance in biomolecular structure and function. The idea that the central bridging proton can be replaced by any of various electronegative atoms has fostered the rapidly growing exploration of related noncovalent bonds that include halogen, chalcogen, pnicogen, and tetrel bonds.

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