New frontiers in host-guest chemistry: The gas phase

Brodbelt, Jennifer S.; Liou, Chien Chung

doi:10.1351/pac199365030409

Cited by 44 publications

(40 citation statements)

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“…This special affinity in the condensed-phase has been attributed to a variety of factors including the "best-fit" phenomena [5] between K + and the 18c6 cavity. However, initial gas phase studies [6,7] of alkali metal ion:18c6 complexes did not replicate this selective behavior of 18c6 for K + . Experimental [8,9] and computational [10] studies showed that the effect of microhydration was crucial in bridging the gap between the gas phase and the condensed phase.…”

Section: Introductionmentioning

confidence: 91%

Infrared spectroscopy of gas-phase hydrated K+:18-crown-6 complexes: Evidence for high energy conformer trapping using the argon tagging method

Rodriguez

Lisy

2009

International Journal of Mass Spectrometry

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Section: Introductionmentioning

confidence: 91%

Infrared spectroscopy of gas-phase hydrated K+:18-crown-6 complexes: Evidence for high energy conformer trapping using the argon tagging method

Rodriguez

Lisy

2009

International Journal of Mass Spectrometry

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“…This article intends to review the progress made in the field of gas-phase studies of host-guest complexes and supramolecular assemblies (also, see : Brodbelt & Liou, 1993;Dearden et al, 1993;Vincenti et al, 1993Vincenti et al, , 1998Vincenti, 1995;Brodbelt, , 2000Brodbelt & Dearden, 1996;Dearden, 1996;Schalley, 2000). It also includes reports with a mass spectrometric focus, when solution-phase properties are analyzed by mass spectrometric methods.…”

Section: Benefits Of Mass Spectrometry For Supramolecular Chemistrymentioning

confidence: 99%

Molecular recognition and supramolecular chemistry in the gas phase

Schalley

2001

Mass Spectrometry Reviews

289

178

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Supramolecular chemistry, in particular, the fields of molecular recognition and self-assembly, profit much from the development of soft ionization techniques and advanced methods for mass analysis and gas-phase chemistry. Vice versa, weakly bonded architectures and host-guest complexes represent a veritable challenge for the mass spectrometrist, leading to further development of methods and techniques. This review describes the state-of-the-art in this field, and includes topics such as the effects of solvation on meta binding to crown ethers, chiral discrimination of guests by chiral hosts, the elucidation of the secondary structure of self assembled complexes, and the mechanistic pathways of self assembly or the fragmentations of supramolecular complexes in the gas phase.

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“…In addition, donor atoms such as nitrogen that have smaller electronegativity would cause lower dipole-ionic interaction towards the cations, consequently aza-crown ethers that possess nitrogen within the cavity would have weaker retention of the cations and thus resulting in the lower separation efficiency when compared to the typical crown ether, i.e. 2AM18C6 [15][16].…”

Section: Effect Of Eluent On the Retention Of Analyte Anionsmentioning

confidence: 99%

Development of Chemically Bonded Crown Ether Stationary Phases in Capillary Ion Chromatography

2014

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Three types of crown ethers (i.e. 1-aza-15-crown-5-ether, 1-aza-18-crown-6-ether and 2-aminomethyl-18-crown-6-ether) were chemically bonded to silica gels via a simple 2-step reaction and the resulted stationary phases were evaluated for the separation of both anions and cations in capillary ion chromatography. It was found that the chemically bonded stationary phases were most stable and relatively sharper peaks were obtained when a mixture of toluene:acetonitrile = 7:3 was used as the reaction solvent in the second step reaction. The size of crown ether cavity as well as the presence of nitrogen atom within the cavity affected the retention behaviors of the ions. As for the separation of anions, it was found that the eluent cations were trapped on the stationary phases and acted as the anion-exchange site, viz. the anions were separated in the ion-exchange mode. Without the obstruction of nitrogen atom, 2-aminomethyl-18-crown-6-ether could easily form complexes with metal cations, and the retention as well as elution order were dependant on the complex formation constant between crown ether and the metal cations. Eluent with higher pH favored the retention and separation of the metal cations.

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New frontiers in host-guest chemistry: The gas phase

Abstract: Abstract

Cited by 44 publications

References 0 publications

Infrared spectroscopy of gas-phase hydrated K+:18-crown-6 complexes: Evidence for high energy conformer trapping using the argon tagging method

Infrared spectroscopy of gas-phase hydrated K+:18-crown-6 complexes: Evidence for high energy conformer trapping using the argon tagging method

Molecular recognition and supramolecular chemistry in the gas phase

Development of Chemically Bonded Crown Ether Stationary Phases in Capillary Ion Chromatography

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