On the basis of the idea that hydrogen bonds consist of two types of bonds, the stronger O–H and weaker HO bonds are, for the first time, considered to have different bond-valence parameters d 0 S and d 0 W, respectively. According to the electrostatic equilibrium distribution of the ...
Rliey K E. Ab initio studies of the characteristics of hydrogen bonds involing aromatically bound hydroxyl and amino groups[J], Int. J. Quantum Chem., 2010,110:1833.Rliey K E.Ab initio studies of the characteristics of hydrogen bonds involing aromatically bound hydroxyl and amino groups....
Experimental/ hydrogen bondsiceliquid structuremolecular configurationsneutron diffractionwater/ structural characteristicsH-bonded networkswatericemolecular configurationsThe molecular configurations of water molecules in the disordered condensed state are investigated by neutron diffraction. The results provide evidence...
Unexpected IR characteristics of hydrogen bonds in the 18-crown-6-ether complex of the H3O+ hydronium ion. Can the location of the protons be specified? Author(s): Stoyanov, ES; Reed, CA | Abstract: The vas(COC) IR spectral signatures of polyethers in H-bonded hydronium ion complexes ha...
The temperature dependence of constants of the equilibrium monomer – complex is examined, and thermodynamic characteristics of the complexes are calculated..Experimental/ chemical equilibriumenthalpyhydrogen bondsinfrared spectraorganic compoundsvibrational states/ hydrogen-bond complexes...
In Section 4.1 “Covalent Bonds”, we stated that the covalent bond in the hydrogen molecule (H2) has a certain length (about 7.4 × 10−11 m). Other covalent bonds also have known bond lengths, which are dependent on both the identities of the atoms in the bond and whether the bo...
In late 2022, SARS-CoV-2 Omicron subvariants have become highly diversified, and XBB is spreading rapidly around the world. Our phylogenetic analyses suggested that XBB emerged through the recombination of two cocirculating BA.2 lineages, BJ.1 and BM.1.1
The intensity of tightly bound cyclic OH tetramers and OH–ether O hydrogen bonds were higher than other hydrogen bonds in the 3700–3600 cmregion of infrared (IR) spectra. The density of alkyl chains and cross-linking reactions affected the yield of tar. The aromaticity of char increased ...
Halogen-freebasematerials are less likely to form hydrogen bonds than halogen materials.For the base material, low water absorption has a certain influence on improving the reliability and stability of the base material. 5. SmallCoefficient ofThermalExpansion ...
The pyrrolidinone molecules are held together by a complex series of intermolecular hydrogen bonds which will be described below. The channels, when viewed down the cavity (Figure 3), have a square cross-section, with A and A' of the asymmetric unit lying along the channel wall opposite to ...