Kinetics of the gas phase reactions of the ion C5H5Fe+ with substituted pyridines

Iron-Promoted C-C Bond Formation in the Gas Phase

An unusual iron transfer and carbon-carbon coupling take place in gas-phase ionized mixtures containing ferrocene and dichloromethane. Ferrous chloride and the protonated benzenium ion are eventually formed by a thermal and efficient reaction, through stable intermediates that undergo a remarkable reorganization. The mechanism of the concerted iron extrusion, carbon-chlorine bond activation and carbon-carbon bond formation is elucidated by electronic structure calculations that show the crucial role of iron.

Ion Molecule Reactions between Ligated Transition Metal Cations with Methane, Ethane and Propane in a High Pressure Ion Source

The reactions of CH4, C2H6 and C3H8 with [η5-C5H5M(CO) n]+ (M = Fe, Co and Ni; 0 ≤ n ≤ 2) in the gas phase have been studied using a double focusing mass spectrometer with a high pressure ion source (HPIS). The products observed are mainly described as weakly bound ion molecule complexes. Carbon–hydrogen bond insertions were observed with propane and only to a minor extent with ethane. Methane was found to form ion molecule complexes only with ligated transition metal cations. The reactivity was influenced by the number of carbonyl ligands and the metal cations. The main adducts formed were obtained when one or no CO ligands were bound to the cyclopentadienyl metal cation. No adducts between the alkanes and naked transition metal cations or protonated metal compounds were found.

The 3D quadrupole ion trap mass spectrometer as a complete chemical laboratory for fundamental gas-phase studies of metal mediated chemistry

Electrospray ionization provides a "treasure trove" of metal containing ions whose fundamental reactivity can be studied via collision induced dissociation and ion-molecule reactions using the multistage mass spectrometry capabilities of the quadrupole ion trap mass spectrometer. Examples of metal mediated chemistry relevant to catalysis, C-C bond coupling, bioinorganic and supramolecular chemistry are highlighted.

Quadrupole ion trap studies of fundamental organic reactions

Over the past several decades, quadrupole ion traps have become important instruments in the study of gas phase ion/molecule reactions. As a part of this work, they have been employed in a number of studies focused on fundamental organic reaction mechanisms. In this review, the general features and limitations of quadrupole ion traps are discussed followed by a description of representative ion trap studies of organic reaction mechanisms such as substitution, elimination, and acyl transfer reactions.