Length of a hydrogen bond in water

Value 0.144 nm
Organism Generic
Reference Modig K, Pfrommer BG, Halle B. Temperature-dependent hydrogen-bond geometry in liquid water. Phys Rev Lett. 2003 Feb 21 90(7):075502PubMed ID12633241
Method Researchers determined the hydrogen-bond geometry in liquid water from 0 to 80°C by combining measurements of the proton magnetic shielding tensor with ab initio density functional calculations.
Comments Considering the widely recognized importance of hydrogen bonding for the structure and properties of water, there is surprisingly little experimental information available on the temperature-dependent hydrogen-bond geometry. Models of water structure usually invoke structural motifs with well-defined hydrogen-bond geometry [13–16], often inspired by high-pressure ice polymorphs. If the distributions of hydrogen-bond length and angle in liquid water were available, preferably over a wide temperature range, such models could be tested decisively. Researchers' aim is to provide this missing information. To this end, they make use of the magnetic shielding tensor s, which relates the applied magnetic field to the local field experienced by the magnetic moment of a water proton. The exquisite sensitivity of the shielding tensor to the local electronic environment makes it a powerful probe of hydrogen bonding [17].
Entered by Ron Milo - Admin
ID 101065