chemical polarity

(redirected from Polar molecules)

chemical polarity

[′kem·i·kəl pə′lar·əd·ē]
(physical chemistry)
Tendency of a molecule, or compound, to be attracted or repelled by electrical charges because of an asymmetrical arrangement of atoms around the nucleus.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Amine oxides are high polar molecules and have their polarity close to that of quaternary ammonium salts.
In general pharmaceutical practice, analytical fractions containing weakly polar molecules are commonly separated and studied in great detail, while fractions containing molecules of high polarity are often ignored.
Understanding how reactivity descriptors of these polar molecules and their tautomers are modified in going from the gas phase into solution can be understood with the solvent-induced increase in the dipole moment value (Table 4) as well as thermodynamic parameters.
When dipoles are exposed to moderate electromagnetic field frequency, the polar molecules will try to orientate themselves by following delay according to the field polarity as shown in Fig.
Wang's team at the University of California, Riverside, turned instead to a different type of non-covalent bond called an ion-dipole interaction, a force between charged ions and polar molecules. "Ion-dipole interactions have never been used for designing a self-healing polymer, but it turns out that they're particularly suitable for ionic conductors," Wang says.
It also has a special bond called an ion-dipole interaction that creates a force between charged ions and polar molecules. When the molecules are torn apart or scratched, they attract to each other and repair themselves.
The 12 lectures identify new directions in the field of ultracold physics, such as quantum gases with long range interactions, either due to strong magnetic dipole forces, due to Rydberg excitations, or, for polar molecules due to electric dipole interactions; quantum gases in lower dimensions; quantum gases with disorder; atoms in optical lattices, now with single-site optical resolution; systems with non-trivial topological properties such as spin-orbit coupling or in artificial gauge fields; quantum impurity problems (Bose and Fermi polarions); and quantum magnetism.
The material to be treated is conveyed through an electrode array where this alternating energy causes polar molecules in the material to continuously reorient themselves to face opposite poles much like the way bar magnets behave in an alternating magnetic field.
Like other polar surfaces, titanium (iv) oxide has the tendency to adsorb polar molecules including water molecules.
Just as a polar size exclusion chromatography column removes small polar molecules from the mobile phase, wood is removing small polar material from the adhesive phase.