ion pair


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ion pair

Two particles of opposite charge, usually an electron and a proton.
See also: pair
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
As the method of 4-MeI in caramel and caramel containing food products require selective sample preparation, ion pair extraction with subsequent derivatization with IBCF was used.
The higher catalytic activity in toluene compared to that in heptane suggests that in toluene the catalyst is more accessible to the monomer thanks to the opening of the MAO-catalyst ion pair. This is a common observation that makes toluene the solvent of choice for polymerization with homogeneous, single-site catalysts.
It was not practical to aspirate the organic solvent of ion pair in the atomic absorption spectrometer because the high chlorine-carbon ratio would lead to the formation of a large quantity of HCl in the frame which would damage the instrument [41].
They have many substantial advantages as compared to ionic bases, such as milder reaction conditions, enhanced reactivity of the more naked anions in the poorly associating ion pairs formed, and better solubility [28-30].
(c) Finally, the presence of ion pairs and their ability to transport charge was considered.
Ion pair reagent TFA and TCA in the mobile phase could help to retain polar amino molecules on the reverse-phase columns; however, sensitivity may be compromised due to ion suppression.
Equation (i) represents the slow association of [S.sub.2][O.sub.8.sup.2-] and [Ag.sup.+] ions, which results in formation of an ion pair [[[Ag.sub.2][S.sub.2][O.sub.8]].sup.-1].
Signal suppression has been explained by the combined effect of unstable spray generation due to high conductivity and surface tension (7) and ion pair formation between analyte and the TFA anion (8).
For nonpolar organic particles in polar organic media, the surface can be charged by adsorbing a neutral ion pair. Dissociation then occurs with one part of the ion pair desorbing leaving a charged particle.
The method of quantifying arsenic species was modified from previous methods using ion pair chromatographic separation with HGAFS (43,46).
The choice of functional monomer is often based on its ability to form hydrogen bonds or an ion pair with the template.
Firstly, inorganic anions form ion pair complexes with heavy metals and may thereby reduce the sorption of heavy metals.