Isomer Separation of Iron Oxide Cluster Cations by Ion Mobility Mass Spectrometry

Ohshimo, Keijiro; Komukai, Tatsuya; Moriyama, Ryoichi; Misaizu, Fuminori

doi:10.1021/jp5015687

Cited by 55 publications

(73 citation statements)

References 37 publications

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“…6 at an ioninjection energy E i of 250 eV. In these mass spectra, (FeO) n + and Fe n O + n+1 were predominant for the cations, 19) Figure 7 shows TOF mass spectra of cobalt oxide cluster cations and anions at E i =250 eV obtained in the present study. In this gure, although the predominant cluster ion compositions are found to be similar with those of iron oxide cluster ions, they have slightly smaller number of oxygen atoms: (CoO) n + and Co n O + n−1 were strongly observed in positive cluster ions, and (CoO) n − and Co n O − n+1 were observed in negative cluster ions.…”

Section: Application To Transition Metal Oxide Clusters-(2) Cluster Cmentioning

confidence: 55%

“…1. [18][19][20]25) Either of the positive or negative ions were examined by this apparatus, by changing the polarity of voltages applied in the electrodes. Cluster ions were produced by combination of a laser vaporization method with subsequent chemical reactions.…”

Section: Methodsmentioning

confidence: 99%

“…We have already reported the geometrical structures of oxide cations of Zn, Co, and Fe, from the IMS measurements, along with the determination of stable cluster sizes and compositions from the ion injection energy dependences of the mass spectra. [17][18][19] Here we present results of other metal oxide ions in addition to Co and Fe, including cations and anions.…”

Section: Application To Transition Metal Oxide Clusters-(1) Titanium mentioning

confidence: 98%

“…(n=2-9) 19) and cobalt oxide cluster cations (CoO) n + (n=2-7) and Co n O + n−1 (n=5-7). 18) Both of these cluster ions have ionic bonding nature in which each metal cation binds exclusively with oxygen anions.…”

Section: Application To Transition Metal Oxide Clusters-(2) Cluster Cmentioning

confidence: 99%

“…19) Among those studies, we were necessary to obtain cluster ion mass spectra, which were di cult to obtain at a one-time measurement because of the ion packet dispersion due to the wide range of ion mobilities. From a "total ion" mass spectrum which we constructed in the IMS measurement, we have found that it reveals the stable ion mass distribution in which the initially produced ions were dissociated to other ions with stable cluster sizes or stable chemical compositions as a result of collisions with bu er gas atoms in the dri cell.…”

Section: Introductionmentioning

confidence: 99%

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Application of Ion Mobility-Mass Spectrometry to the Study of Ionic Clusters

et al. 2014

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Stable cluster sizes and compositions have been investigated for cations and anions of ionic bond clusters such as alkali halides and transition metal oxides by ion mobility-mass spectrometry (IM-MS). Usually structural information of ions can be obtained from collision cross sections determined in IM-MS. In addition, we have found that stable ion sizes or compositions were predominantly produced in a total ion mass spectrum, which was constructed from the IM-MS measurement. ese stable species were produced as a result of collision induced dissociations of the ions in a dri cell. We have con rmed this result in the sodium uoride cluster ions, in which cuboid magic number cluster ions were predominantly observed. Next the stable compositions, which were obtained for the oxide systems of the rst row transition metals, Ti, Fe, and Co, are characteristic for each of the metal oxide cluster ions.

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Section: Application To Transition Metal Oxide Clusters-(2) Cluster Cmentioning

confidence: 55%

Section: Methodsmentioning

confidence: 99%

Section: Application To Transition Metal Oxide Clusters-(1) Titanium mentioning

confidence: 98%

Section: Application To Transition Metal Oxide Clusters-(2) Cluster Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of Ion Mobility-Mass Spectrometry to the Study of Ionic Clusters

et al. 2014

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Structure and properties of iron oxide clusters: From Fe₆ to Fe₆O₂₀ and from Fe₇ to Fe₇O₂₄

Gutsev¹,

Belay²,

Gutsev

et al. 2016

J Comput Chem

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Geometrical and electronic structures of the neutral and singly negatively charged Fe6 On and Fe7 Om clusters in the range of 1 ≤ n ≤ 20 and 1 ≤ m ≤ 24, respectively, are computed using density functional theory with the generalized gradient approximation. The largest clusters in the two series, Fe6 O20 and Fe7 O24 , can be described as Fe(FeO4 )5 and Fe(FeO4 )6 or alternatively as [FeO5 ](FeO3 )5 and [FeO6 ](FeO3 )6 , respectively. The Fe6 O20 and Fe7 O24 clusters possess adiabatic electron affinities (EAad ) of 5.64 eV and 5.80 eV and can be attributed to the class of hyperhalogens since FeO4 is an unique closed-shell superhalogen with the EAad of 3.9 eV. The spin character of the lowest total energy states in both series changes from ferromagnetic to ferrimagnetic or antiferromagnetic when the first FeOFe bridge is formed. Oxidation decreases substantially the polarizability per atom of the initial bare clusters; namely, from 5.98 Å(3) of Fe6 to 2.47 Å(3) of Fe6 O20 and from 5.67 Å(3) of Fe7 to 2.38 Å(3) of Fe7 O24 . The results of our computations pertaining to the binding energies of O, Fe, O2 , and FeO in the Fe7 Om series provide an explanation for the experimentally observed abundance of the iron oxide nanoparticles with stoichiometric compositions. © 2016 Wiley Periodicals, Inc.

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Energetics and structural characterization of isomers using ion mobility and gas‐phase H/D exchange: Learning from lasso peptides

2015

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State-of-the-art characterization of proteins using MS namely relies on fragmentation methods that allow exploring featured dissociative reaction pathways. These pathways are often initiated by a series of potentially informative mass-constant conformational changes that are nonetheless frequently overlooked by lack of adequate investigation techniques. In the present study, we propose a methodology to readily address both structural and energetic aspects of stereoisomerization reactions using ion mobility coupled with MS. To this end, a commercial spectrometer was used as a reactor comprising an energy resolved collisional activation step intended at promoting controlled conformational changes and a structural assignment step dedicated to the identification of the generated isomers. This identification relies on ion mobility and other on-line coupled techniques, namely an originally designed gas-phase H/D exchange experiment. We here apply this methodology to characterize the isomerization kinetics of capistruin, a 19-residue long lasso-folded peptide. We expect this approach to bring insights into the physical origin of global dissociation thresholds monitored in MS/MS experiments and to set a promising basis for quantitative investigations of the stability of different molecular folds.

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Isomer Separation of Iron Oxide Cluster Cations by Ion Mobility Mass Spectrometry

Cited by 55 publications

References 37 publications

Application of Ion Mobility-Mass Spectrometry to the Study of Ionic Clusters

Application of Ion Mobility-Mass Spectrometry to the Study of Ionic Clusters

Structure and properties of iron oxide clusters: From Fe₆ to Fe₆O₂₀ and from Fe₇ to Fe₇O₂₄

Energetics and structural characterization of isomers using ion mobility and gas‐phase H/D exchange: Learning from lasso peptides

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Isomer Separation of Iron Oxide Cluster Cations by Ion Mobility Mass Spectrometry

Cited by 55 publications

References 37 publications

Application of Ion Mobility-Mass Spectrometry to the Study of Ionic Clusters

Application of Ion Mobility-Mass Spectrometry to the Study of Ionic Clusters

Structure and properties of iron oxide clusters: From Fe6 to Fe6O20 and from Fe7 to Fe7O24

Energetics and structural characterization of isomers using ion mobility and gas‐phase H/D exchange: Learning from lasso peptides

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Structure and properties of iron oxide clusters: From Fe₆ to Fe₆O₂₀ and from Fe₇ to Fe₇O₂₄