212-204-0075
info@pyvot.tech
Types of interactions | Origin of force | Feature | |||||||
van der Waals force |
|
|
Attenuates at -6th power of distance and makes an important contribution only at short distances. Dispersion is dominant in nonpolar molecules. |
||||||
Charge transfer interaction | Electron donor-Electron acceptor | Coloring by charge transfer absorption |
|||||||
Hydrogen bond | Functional groups such as OH and NH |
Strong specificity and directivity |
|||||||
Hydrophobic interaction | Non-polar groups in polar solvents |
Entropy domination |
As shown in the figure above, benzene has the highest electron density in the center, and the phenyl and biphenyl
groups of the L11 stationary phase have a dipole-dipole interaction, which is the orientation force of the van der
Waals force. It then exhibits characteristic selectivity by the π-π and CH-π interactions that are treated as part of
them.
★π-π stacking and T-type stacking are known as benzene arrangement states as π-π interactions. It is presumed that
T-type stacking is close to the CH-π interaction, which is the interaction between the central part of benzene and
hydrogen of CH.