Halogen bonding is the attractive interaction of an electrophilic region of a halogen with a nucleophile. Its geometry, energy, and dominantly electrostatic nature resemble that of the hydrogen bond. Halogen bond strength critically depends on the electron deficiency of the halogen. Accordingly, halo...
The experimental XAS spectra (black lines) ofDye-I•+···Cl–(a) andDye-Br•+···Cl–(b) and the corresponding TD-DFT simulated spectra (calculated using BP86, solid orange lines) are shown along with the relative oscillator strengths of the individual calculated transitions (vertical...
Dihalogens (I2, Br2, etc) tend to form strong halogen bonds. The strength and effectiveness of chlorine and fluorine in XB formation depend on the nature of the XB donor. If the halogen is bonded to an electronegative (electron withdrawing) moiety, it is more likely to form stronger halog...
Thus we compare the effect of the chalcogen electron donor on the strength and nature of halogen bonding involving multivalent halogens.doi:10.1080/00268976.2019.1656834Mingchang HouYanqing WangShubin YangQingzhong LiTaylor And FrancisMolecular Physics...
Bonds vary widely in their strength. Generally covalent and ionic bonds are often described as "strong", whereas hydrogen bonds and van der Waals' bonds are generally considered to be "weak". Care should be taken because the strongest of the "weak" bonds can be stronger than the weakest of...
Bürgi H-B, Dunitz J (1987) Fractional bonds: relations among their lengths, strengths, and stretching force constants. J Am Chem Soc 109:2924–2926 Article Google Scholar Parr RG, Borkman RF (1968) Simple bond-charge model for potential-energy curves of homonuclear diatomic molecules. J ...
Pi bonds are weaker than sigma bonds, however a double bond has the combined strength of the σ and π bonds. Analogously, a triple bond has the combined strength of a σ and two π bonds. As an example, each of the hydrogen atoms in water (H2O) is bonded to the oxygen via a ...
The significantly greater strength of the I···N halogen bonded synthon over the I···S interaction results in initial formation of a 2:1 cocrystal comprising only I···N interactions. Prolonged grinding gives a 1:1 phase with both synthons [65]. Halogen bonding between diiodotetrafluoro...
influences the strength of the bond: the use of too little solvent leads to a weak bond; if the solvent layer is too thick, however, it can take days before the solvent is diffused out of the bond and local material degradation can occur. quadrantplastics.com 所用溶剂的量将极大地影响粘...
which contain two or more atoms. A chemical bond is the attraction caused by the electromagnetic force between opposing charges, either between electrons and nuclei, or as the result of a dipole attraction. The strength of bonds varies considerably; there are "strong bonds" such as covalent or...