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- Ion-neutral_complex abstract "An ion-neutral complex in chemistry is an aggregate of an ion with one or more neutral molecules in which at least one of the partners has a rotational degree of freedom about an axis perpendicular to the intermolecular direction In chemistry, the dissociation of a molecule into two or more fragments can take place in the gas phase, provided there is sufficient internal energy for the requisite barriers to be overcome.For many years, it was assumed that the fragments of a gas phase dissociation simply fly apart. In 1958, Allan Maccoll suggested that the decomposition of alkyl halides (RX) might take place via the intermediacy of ion pairs, [R+ X−], in which the charged fragments were no longer covalently bonded but were held together by electrostatic attraction. Maccoll and coworkers subsequently examined chlorine isotope effects in the thermal decomposition of chloroethane and concluded that the data did not support that interpretation; however, he had provided the germ of an idea that came to fruition two decades later in the study of decompositions of electrically charged molecules.In the late 1970s three research groups—in England, the United States, and France—independently provided evidence for the occurrence of ion-neutral complexes (sometimes called ion-dipole complexes or ion-molecule complexes) in the unimolecular dissociations of positive ions under the conditions associated with mass spectrometry (i.e. as isolated species in a vacuum). The general idea is that a charged species, RY+, can give rise to dissociation fragments via a transient complex, [R+ Y], in which the electrically charged partner, R+, can undergo molecular rearrangements at the same time as it rotates relative to the neutral partner, Y. Similarly, the neutral partner, Y, can also rotate relative to the charged partner, as well as having the ability to exchange Hydrogens and internal energy with it. More recently several research groups have provided evidence that revives Maccoll's original hypothesis, but with the variation that the fragments that sojourn in the presence of one another are both electrically uncharged. In other words, dissociations of a neutral molecule RX can take place in the gas phase via the intermediacy of radical pairs [R· X·], where X· can be as small as a hydrogen atom. In the gas phase such intermediates are often called roaming radicals.".
- Ion-neutral_complex wikiPageID "28948109".
- Ion-neutral_complex wikiPageLength "4381".
- Ion-neutral_complex wikiPageOutDegree "25".
- Ion-neutral_complex wikiPageRevisionID "620799711".
- Ion-neutral_complex wikiPageWikiLink Activation_energy.
- Ion-neutral_complex wikiPageWikiLink Alkyl_halides.
- Ion-neutral_complex wikiPageWikiLink Category:Chemical_pathology.
- Ion-neutral_complex wikiPageWikiLink Category:Mass_spectrometry.
- Ion-neutral_complex wikiPageWikiLink Category:Physical_chemistry.
- Ion-neutral_complex wikiPageWikiLink Chemistry.
- Ion-neutral_complex wikiPageWikiLink Chlorine.
- Ion-neutral_complex wikiPageWikiLink Chloroethane.
- Ion-neutral_complex wikiPageWikiLink Coulombs_law.
- Ion-neutral_complex wikiPageWikiLink Covalent_bond.
- Ion-neutral_complex wikiPageWikiLink Dissociation_(chemistry).
- Ion-neutral_complex wikiPageWikiLink Electrostatic_attraction.
- Ion-neutral_complex wikiPageWikiLink Free_radical.
- Ion-neutral_complex wikiPageWikiLink Gas_phase.
- Ion-neutral_complex wikiPageWikiLink Haloalkane.
- Ion-neutral_complex wikiPageWikiLink Hydrogen.
- Ion-neutral_complex wikiPageWikiLink Internal_energy.
- Ion-neutral_complex wikiPageWikiLink Ion.
- Ion-neutral_complex wikiPageWikiLink Ion-association.
- Ion-neutral_complex wikiPageWikiLink Ion_pair.
- Ion-neutral_complex wikiPageWikiLink Kinetic_isotope_effect.
- Ion-neutral_complex wikiPageWikiLink Mass_spectrometry.
- Ion-neutral_complex wikiPageWikiLink Molecular_aggregate.
- Ion-neutral_complex wikiPageWikiLink Molecular_rearrangement.
- Ion-neutral_complex wikiPageWikiLink Molecule.
- Ion-neutral_complex wikiPageWikiLink Phase_(matter).
- Ion-neutral_complex wikiPageWikiLink Radical_(chemistry).
- Ion-neutral_complex wikiPageWikiLink Rearrangement_reaction.
- Ion-neutral_complex wikiPageWikiLink Thermal_decomposition.
- Ion-neutral_complex wikiPageWikiLink Unimolecular_dissociation.
- Ion-neutral_complex wikiPageWikiLinkText "Ion-neutral complex".
- Ion-neutral_complex hasPhotoCollection Ion-neutral_complex.
- Ion-neutral_complex wikiPageUsesTemplate Template:Use_dmy_dates.
- Ion-neutral_complex subject Category:Chemical_pathology.
- Ion-neutral_complex subject Category:Mass_spectrometry.
- Ion-neutral_complex subject Category:Physical_chemistry.
- Ion-neutral_complex hypernym Aggregate.
- Ion-neutral_complex type Country.
- Ion-neutral_complex comment "An ion-neutral complex in chemistry is an aggregate of an ion with one or more neutral molecules in which at least one of the partners has a rotational degree of freedom about an axis perpendicular to the intermolecular direction In chemistry, the dissociation of a molecule into two or more fragments can take place in the gas phase, provided there is sufficient internal energy for the requisite barriers to be overcome.For many years, it was assumed that the fragments of a gas phase dissociation simply fly apart. ".
- Ion-neutral_complex label "Ion-neutral complex".
- Ion-neutral_complex sameAs m.0dgr5hm.
- Ion-neutral_complex sameAs Q6062814.
- Ion-neutral_complex sameAs Q6062814.
- Ion-neutral_complex wasDerivedFrom Ion-neutral_complex?oldid=620799711.
- Ion-neutral_complex isPrimaryTopicOf Ion-neutral_complex.