dipole-dipole interaction energyData for Δ H τ, the enthalpy of activation determining the temperature dependence of the Debye relaxation time have been collected and compared for polar aprotic solvents of lower molecular weight. It is shown that the variation in this quantity with solvent can be...
Dipole-dipole interactions and their role in relaxation processes in polar solvents 来自 Elsevier 喜欢 0 阅读量: 21 作者: WR Fawcett 摘要: Data for Δ H τ, the enthalpy of activation determining the temperature dependence of the Debye relaxation time have been collected and compared for polar ...
Isopentyl ether is a more polar solvent than the n-alkanes and is expected to be more competitive in interactions of a dipole-type and as a hydrogen-bond base (it has no hydrogen-bond acidity). The system constants for the five isopentyl ether-containing biphasic systems are summarized in ...
Effects of Polar Interactions and Molecular Packing upon the Induced Smectic Mesomorphisminduced smecticsnematic mixturessteric factorsdipole forcescomplex formationphase diagramsTo look into the nature of intermolecular forces responsible for the induced smectic mesophase formation, model binary systems were ...
Here we use a molecularstatistical theory to show that sufficiently strong polar interactions between bent-shaped molecules may lead to experimentally observed reduction of the bend elastic constant in the nematic phase even if electrostatic dipoledipole interactions are not taken into account. We ...
To capture this behaviour, Onsager constructed a deceptively simple model of dipole–dipole interactions (Fig. 1a): a point dipole is located at the centre of a spherical cavity of molecular dimensions in a continuous polarisable medium. Solving the Laplace equation he found that the reaction ...
2. Polar Solvents Have Large Dipole Moments. Non-Polar Solvents Have Small Or Zero Dipole Moment OK. So what does “polar” and “non-polar” mean? Polar solventshave large dipole moments (aka “partial charges”); they contain bonds between atoms with very different electronegativities, such...
Q. Mixed-space approach for calculation of vibration-induced dipole-dipole interactions. Phys. Rev. B 85, 224303 (2012). Article CAS Google Scholar Wang, Y. et al. A mixed-space approach to first-principles calculations of phonon frequencies for polar materials. J. Phys. Condes. Matter 22...
Solubility:Polar compounds are generally soluble in polar solvents, such as water, as they can form hydrogen bonds or dipole-dipole interactions. Nonpolar compounds are soluble in nonpolar solvents, such as hydrocarbons, but are insoluble or have low solubility in polar solvents. ...
The possible significance of internal dipole-induced dipole interactions is discussed tentatively. Although quantitative estimates of the various contributions remain uncertain, consideration of effective force constants suggests that polar, including solvent, interactions may largely determine the overall ...