Hydrogen bond is a electrostatic attraction between a hydrogen atom which is bond to a more electronegative atom such as Nitrogen, Oxygen, fluorine. These are two types of hydrogen bonds :- 1) Intermolecular Hydrogen bonding :- It occurs between two separate molecules.

2023年11月21日 · A hydrogen bond is the electromagnetic attraction between polar molecules in which hydrogen is bound to a larger atom, such as oxygen or nitrogen. This is not a sharing of electrons, as in a ...

2020年10月26日 · $\begingroup$ Yes, in each hydrogen bond of H2O, you can trace out three centres : O-H···O, where the O from one water molecule acts as the donor and also the first center, the hydrogen attached with donor oxygen forms the second center, while the oxygen from another water molecule as an acceptor and the third center $\endgroup$ –

Note the positioning: the lower-energy bonding orbital is concentrated between the atoms where the bond forms and also around the more electronegative fluorine atom, while the higher-energy antibonding orbital is mostly in less stable regions outside the bond and around the hydrogen atom. Now introduce a second hydrogen fluoride molecule.

2015年5月17日 · A molecule that has hydrogen bonding usually follows these two premises. 1.) There is a hydrogen atom involved. 2.) Hydrogen must be bonded to a highly electronegative element which are nitrogen ($\ce{N}$), fluorine ($\ce{F}$) and oxygen ($\ce{O}$).

2017年7月14日 · Hydrogen bonding is well known to cause large changes in chemical shift values– this is evident if you look up the chemical shift of an alcohol in a data-book (for an aliphatic alcohol this is anywhere between 0.5 and ca. 6.0 ppm depending on solvent/concentration), where a large range of values are given.

2020年1月10日 · The strongest hydrogen bonds are those where hydrogen bond and covalent bond with hydrogen become interchangable ("symmetric hydrogen bonds"). In his 2002 review, Steiner wrote: All hydrogen bonds can be considered as incipient proton transfer reactions, and for strong hydrogen bonds, this reaction can be in a very advanced state.

2017年1月3日 · The hydrogen bond is due to the fact that there is a covalent bond between an hydrogen atom and an high electronegativity atom such as O, F or N. What happen is that because of the small size of the hydrogen atom the dipole is highly concentrated in a small volume, and this results in the high directional strength of the hydrogen bond.

2018年4月27日 · Amongst the strongest hydrogen bonds are formed by $\ce{ N, O, F}$ because of their high electronegativity. There's evidence that the ions $\ce{Cl-, I-, Br- }$ form hydrogen bonds that are much stronger than those of the covalently bonded atoms $\ce{Cl}$ can form weak hydrogen bonds, but $\ce{Br}$ and $\ce{I}$ form very weak bonds if at all.

The hydrogen bond (5 to 30 kJ/mole) is stronger than a van der Waals interaction, but weaker than covalent or ionic bonds. This type of bond can occur in inorganic molecules such as water and in organic molecules like DNA and proteins.