Chemical evidence of the stability of praseodymium(v) in gas-phase oxide nitrate complexes

2019 ◽  
Vol 55 (94) ◽  
pp. 14139-14142 ◽  
Author(s):  
Bernardo Monteiro ◽  
Nuno A. G. Bandeira ◽  
Célia Lourenço ◽  
Ana F. Lucena ◽  
José M. Carretas ◽  
...  
Keyword(s):  
Ab Initio ◽  
Gas Phase ◽  
Oxidation State ◽  
Chemical Stability ◽  
Ion Trap ◽  
Quadrupole Ion Trap ◽  
The Stability ◽  
Nitrate Complexes ◽  
Chemical Evidence

The diverse gas-phase reactivity of [LnO2(NO3)2]− complexes with water (Ln = Ce, Pr, Nd), examined in a quadrupole ion trap and complemented by ab initio computations, illuminates the chemical stability of Pr in the unusual +5 oxidation state.

scholarly journals Laboratory formation of large molecules in the gas phase

2019 ◽  
Vol 623 ◽  
pp. A102 ◽  
Author(s):  
Junfeng Zhen
Keyword(s):  
Gas Phase ◽  
Ion Trap ◽  
Quadrupole Ion Trap ◽  
Molecular Clusters ◽  
Large Molecules ◽  
Flight Mass Spectrometry ◽  
Molecular Precursor ◽  
Dust Grain ◽  
Strong Radiation ◽  
Graphene Cluster

We report the experimental study on the formation process of large molecules (e.g. a family group of molecular clusters and graphene) in the gas phase. The experiment was carried out using a quadrupole ion trap in combination with time-of-flight mass spectrometry. As the initial molecular precursor, dicoronylene (DC, C48H20)/anthracene (C14H10) cluster cations, the results show that large PAH cluster cations (e.g., (C14H10)C48Hn+, n = [1–19] and (C14H10)C62Hm+, m = [1–25]) and PAH-graphene cluster cations (e.g., (C14H10)nC48+, n = 0, 1, 2, 3 and (C14H10)mC62+, m = 0, 1, 2) are formed by gas-phase condensation under laser irradiation conditions. We infer that these results present in here provide a formation route for interstellar large molecules under the influence of a strong radiation field in the ISM. The relevance of newly formed species to the nanometer-sized dust grain in space is briefly discussed.

Gas Phase Reactions of Trimethylborate with the [M − H]− Ions of Nucleotides and Their Non-Covalent Homo- and Heterodimer Complexes

2003 ◽  
Vol 56 (5) ◽  
pp. 389 ◽  
Author(s):  
Ana K. Vrkic ◽  
Richard A. J. O'Hair
Keyword(s):  
Gas Phase ◽  
Mass Spectrometer ◽  
Ion Trap ◽  
Quadrupole Ion Trap ◽  
Methanol Molecule ◽  
Collision Induced Dissociation ◽  
Base Loss ◽  
Gas Phase Reactions ◽  
Ion Trap Mass Spectrometer ◽  
Neutral Base

Trimethylborate (TMB) reacts with deprotonated monomer, homo-, and heterodimer ions of nucleotides (2′-deoxyadenosine-5′-monophosphate [dAMP], 2′-deoxycytidine-5′-monophosphate [dCMP], 2′-deoxyguanosine-5′-monophosphate [dGMP], and 2′-deoxythymidine-5′-monophosphate [dTMP]) in a quadrupole ion trap mass spectrometer by addition with concomitant elimination of one or two methanol molecules (monomers), one or three methanol molecules (homodimers), and three methanol molecules (heterodimers). The mode of reaction appears to influence the observed rates, with the loss of only one methanol molecule corresponding to the fastest rate. There appears to be a structure–reactivity correlation for the monomers, with the [dGMP – H]– ions (which adopt a syn conformation of the guanine moiety) reacting fastest with TMB through the loss of only one methanol molecule. No such structure–reactivity trends are observed for the homo- and heterodimers. In addition, the collision-induced dissociation (CID) reactions of the [(dXMP)n − H]– (n = 1 or 2) as well as the [dXMP + dYMP – H + (CH3O)3B – 3(CH3OH)]– ions (where nucleotides X, Y = A, C, G, or T) were studied. The latter fragment to form [dXMP – H + BPO4]– and [dXMP – 3H + BPO3]– ions (where X = A, C, G, or T), while [dXMP – H]– ions fragment by neutral base loss. The homo- and heterodimers fragment to form [dXMP – H]– and [dXMP + HPO3]– ions, and the relative abundances of the [dXMP – H]– monomer ions from the heterodimers led to the following acidity order: dGMP ≈ dTMP > dCMP > dAMP.

Gas-phase reactivity of the O?P(OCH3)2+ phosphonium ion towards ?,?-unsaturated esters in a quadrupole ion trap

2005 ◽  
Vol 40 (4) ◽  
pp. 458-463 ◽  
Author(s):  
Eric Leclerc ◽  
Emmanuelle Leon ◽  
Marie-H�l�ne Taphanel ◽  
Jean-Pierre Morizur
Keyword(s):  
Gas Phase ◽  
Ion Trap ◽  
Quadrupole Ion Trap ◽  
Unsaturated Esters

scholarly journals Spectroscopic observation of two-center three-electron bonded (hemi-bonded) structures of (H2S)n+ clusters in the gas phase

2017 ◽  
Vol 8 (4) ◽  
pp. 2667-2670 ◽  
Author(s):  
Dandan Wang ◽  
Asuka Fujii
Keyword(s):  
Infrared Spectroscopy ◽  
Ab Initio ◽  
Gas Phase ◽  
Spectroscopic Observation ◽  
The Stability

The presence of a two-center three-electron (2c–3e) bonded (hemi-bonded) ion core in the (H2S)n+ cluster is revealed by infrared spectroscopy combined with ab initio calculations. The stability of the hemi-bonded ion core to solvation is also proved.

Laboratory study on the fullerene–PAH-derived cluster cations in the gas phase

2019 ◽  
Vol 490 (3) ◽  
pp. 3498-3507
Author(s):  
Junfeng Zhen ◽  
Weiwei Zhang ◽  
Yuanyuan Yang ◽  
Qingfeng Zhu
Keyword(s):  
Gas Phase ◽  
Ion Trap ◽  
Reaction Pathway ◽  
Theoretical Calculations ◽  
Large Fraction ◽  
Quadrupole Ion Trap ◽  
Fullerene C60 ◽  
Molecule Reaction ◽  
Flight Mass Spectrometry ◽  
Polycyclic Aromatic

ABSTRACT It is possible that fullerene–polycyclic aromatic hydrocarbon (PAH) clusters or associations of fullerenes with PAHs contain a large fraction of interstellar fullerenes in the interstellar medium. Herein, we report the formation and photofragmentation behaviour of fullerene–PAH derivatives, fullerene/9-vinylanthracene (C16H12) and fullerene/9-methylanthracene (C15H12) cluster cations. Experiments are carried out using a quadrupole ion trap in combination with time-of-flight mass spectrometry in the gas phase. The results show that fullerene (C60)/9-vinylanthracene (e.g. [(C16H12)3C60]+), fullerene (C56 and C58)/9-vinylanthracene (e.g. [(C16H12)4C56]+ and [(C16H12)4C58]+), fullerene (C60)/9-methylanthracene (e.g. [(C15H12)3C60]+), and fullerene (C56 and C58)/9-methylanthracene (e.g. [(C15H12)4C56]+ and [(C15H12)4C58]+) cluster cations, i.e. large fullerene-derived molecules, are formed in the gas phase through the ion–molecule reaction pathway. With irradiation, all fullerene–PAH-derived cluster cations lose their monomolecular groups without other fragmentation channels (e.g. dehydrogenation). The structure of newly formed fullerene–PAH-derived cluster cations and the bond energy for these adduction formation pathways are investigated with theoretical calculations. The obtained results provide a general molecular growth route towards large fullerene–PAH derivatives (e.g. large fullerene-derived molecules) with functional PAHs in a bottom-up formation process and insights into the effect of functional groups (e.g. vinyl, –C2H3, and methyl, –CH3) on their formation and photoevolution behaviours. In addition, the fullerene–PAH-derived clusters (from 83 to 170 atoms in total, or ∼2 nm in size) offer a good model of carbon dust grains, and the relevance to the nanometre-sized carbon dust grain in space is briefly discussed.

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