Characterization of isomeric compounds by gas and plasma chromatography

Hagen, D.F.

doi:10.1021/ac50043a022

Cited by 130 publications

(124 citation statements)

References 26 publications

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“…In the limit of low drift field, where the mobility is independent of the field, the reduced mobility is inversely proportional to the orientationally averaged collision integral 38,39 ⍀ avg (1,1) :…”

Section: Methodsmentioning

confidence: 99%

“…24 The technique of ion mobility measurements is based on the fact that isomers of differing shapes travel with different velocities when dragged through a buffer gas by an electric field, and thus can be separated from each other. 1 The resolved peaks are assigned by matching the experimental mobilities with values calculated for candidate geometries. While a wealth of knowledge about the general shapes of various polyatomic ions has been obtained in such studies, detailed structural information has often been elusive.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mobilities of carbon cluster ions: Critical importance of the molecular attractive potential

Shvartsburg¹,

Schatz²,

Jarrold³

1998

The Journal of Chemical Physics

138

208

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Mobilities in helium gas for isomers belonging to the major structural families of carbon clusters identified in drift tube studies ͑chains, monocyclic and bicyclic rings, graphite sheets, and fullerenes and their dimers͒ have been evaluated by trajectory calculations employing a realistic ion-He interaction potential. For all the species considered, the agreement between the measured and calculated mobilities at room temperature improves by at least a factor of 3 over that obtained with the widely used hard-sphere projection approximation. Furthermore, for a large representative sample of clusters belonging to all the above families, the results of trajectory calculations as a function of temperature over the range of 78-360 K are in a good agreement with the measured mobilities. This shows that the C-He pairwise potential is only weakly dependent on the structure and chemical bonding of a carbon cluster. Thus this study demonstrates the universal suitability of trajectory calculations for the accurate prediction of the gas phase mobilities for polyatomic ions with various shapes and sizes, and the uniform superiority of this method over the previously used approximations. In particular, the trajectory calculations for large (nϭ120-140) fullerenes show that these cages have near-spherical shapes found by theory, while the projection approximation would erroneously assign them as ''buckytubes.'' It also appears that the mobility may be substantially affected by the degree of charge localization on a specific atom in the cluster, especially at low temperatures.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mobilities of carbon cluster ions: Critical importance of the molecular attractive potential

Shvartsburg¹,

Schatz²,

Jarrold³

1998

The Journal of Chemical Physics

138

208

View full text Add to dashboard Cite

show abstract

“…The technique of IMS has primarily been used for the characterization of small molecules by correlating diffusion rate with size and shape [13,14]. Ion mobilities are measured by determining the time required for a pulse of ions to traverse a uniform electric field in the presence of a buffer gas [15,16] and the size of the particle is directly related to its mobility.…”

Section: Introductionmentioning

confidence: 99%

Electrospray ion mobility spectrometry of intact viruses

Thomas

Bothner

Traina³

et al. 2004

Journal of Spectroscopy

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Abstract. Characterizing supramolecular interactions offers significant challenges using NMR or crystallographic techniques either because of size limitations or the difficulty in forming suitable crystals, while mass spectrometry is largely limited to low resolution mass information. Here we report gas phase measurements of intact virus particles using electrospray ion mobility spectrometry with an accuracy in radial measurements that were sufficient to differentiate closely related species. In addition, measured diameters indicate that iscosahedral virus particles retain their structure in the gas phase as well as undergoing a slight compaction in the absence of solvent. Analysis of the human pathogen adenovirus represents the largest and most sophisticated biomolecular complex detected in the gas phase to date. These results, on a diverse set of viral systems, suggest that ion mobility spectrometry may have broad applications for the analysis of biological complexes.

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“…Ion chromatographic studies have also been carried out on polycyclic aromatic ions to differentiate the isomeric compounds. 17 Benzene dimers are interesting as a prototype for the interaction of aromatic π-systems. Neutral benzene dimers are a subject of intense spectroscopic 18,19 and theoretical study [20][21][22] in order to understand the geometries of aromatic residues in proteins, wherein aromatic-aromatic interactions are important.…”

Section: Introductionmentioning

confidence: 99%

Mobilities of Aromatic Ions Drifting in Helium

et al. 1996

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Aromatic ions are produced in an electron impact ion source and injected into the flow tube section of a selected-ion flow-drift tube (SIFDT) apparatus. The reduced mobilities of C6H5 +, C6H6 +, C6H7 +, C12H12 +, C12H11 +, naphthalene (C10H8 +) cation, and biphenyl (C12H10 +) cation drifting in helium are measured as a function of the characteristic parameter E/N (the ratio of the electric field to the number density of the helium buffer gas atoms in the drift tube). The reduced mobilities of the benzene dimer ions (C12H12 + and C12H11 +) are compared with the measured mobilities of naphthalene and biphenyl cations to correlate the mobilities with ionic structures. An angle-averaged collision cross section of the ions drifting in helium is obtained from the geometric structure of these ions and is used to compute the zero-field mobility. The predicted zero-field mobilities are found to compare well with the experimentally measured mobilities.

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Characterization of isomeric compounds by gas and plasma chromatography

Cited by 130 publications

References 26 publications

Mobilities of carbon cluster ions: Critical importance of the molecular attractive potential

Mobilities of carbon cluster ions: Critical importance of the molecular attractive potential

Electrospray ion mobility spectrometry of intact viruses

Mobilities of Aromatic Ions Drifting in Helium

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