Essay in regards to a Modern Definition of Hydrogen Bond

A hydrogen bond is a electromagnetic desirable interaction among polar substances in which hydrogen (H) is likely to a highly electronegative atom, just like nitrogen (N), oxygen (O) or fluorine (F). The name hydrogen bond is usually something of your misnomer, since it is not a authentic bond nevertheless a particularly strong dipole-dipole fascination, and should certainly not be confused with a covalent bond.

These hydrogen-bond attractions can occur among molecules (intermolecular) or within just different parts of just one molecule (intramolecular).[1] The hydrogen bond (5 to 30 kJ/mole) is stronger than the usual van dieser Waals connection, but less strong than covalent or ionic bonds. This type of bond can occur in inorganic molecules just like water and in organic elements like DNA and protein.

Intermolecular hydrogen bonding is responsible for the substantial boiling point of water (100 В°C) compared to the other group 16 hydrides that have not any hydrogen provides. Intramolecular hydrogen bonding can be partly accountable for the second and tertiary structures of proteins and nucleic stomach acids. It also performs an important role in the structure of polymers, both artificial and organic.

In 2011 an IUPAC Task Group suggested a modern evidence-based definition of hydrogen bonding. The brand new definition was published inside the IUPAC log Pure and Applied Biochemistry.[2] This comprehensive technical survey provides the rationale behind the new definition.[3]

A hydrogen atom attached to a comparatively electronegative atom is a hydrogen bond donor.[5] This electronegative atom is usually fluorine, oxygen, or nitrogen. An electronegative atom such as fluorine, o2, or nitrogen is a hydrogen bond acceptor, whether it is bonded to a hydrogen atom or perhaps not. An example of a hydrogen bond donor is ethanol, which has a hydrogen bonded to oxygen; an example of a hydrogen connection acceptor which will does not have a hydrogen atom attached to it is the oxygen atom upon diethyl ether. Examples of hydrogen bond giving (donors) and hydrogen bond accepting...



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