Gas-phase stability of sandwich complexes of crown ethers with metal cations - as studied by collision-induced dissociation tandem mass spectrometry

2018 ◽  
Vol 32 (18) ◽  
pp. 1651-1657 ◽  
Author(s):  
Rafał Frański
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Gas Phase ◽  
Crown Ethers ◽  
Phase Stability ◽  
Metal Cations ◽  
Collision Induced Dissociation ◽  
Tandem Mass ◽  
Sandwich Complexes

Gas-phase relative stabilities of Tl+-crown ether complexes and Rb+-crown ether complexes

2018 ◽  
Vol 24 (3) ◽  
pp. 279-288 ◽  
Author(s):  
Magdalena Frańska ◽  
Anna Michalak
Keyword(s):  
Mass Spectrometry ◽  
Crown Ether ◽  
Tandem Mass Spectrometry ◽  
Gas Phase ◽  
Collision Induced Dissociation ◽  
Tandem Mass ◽  
Ionic Radii ◽  
Relative Stabilities ◽  
Crown Ether Complexes ◽  
Cation Radius

The gas-phase stabilities of Tl+-crown ether complexes and Rb+-crown ether complexes were studied using the electrospray ionization-collision-induced dissociation-tandem mass spectrometry. Tl+ and Rb+ have identical ionic radii, thus a comparison of the properties of the crown ether complexes with these two cations seems to be justified. The selected crown ethers were 12C4 (it has a cavity smaller than the cation radius), 18C6 (it has a cavity of size similar to the cation radius), 24C8 (it has a cavity greater than the cation radius) and their conjugates. It has been found that the crown ether complexes of stoichiometry 1:1 with Tl+ are more or equally stable in the gas phase than the crown ether complexes with Rb+. However, 2:1 complexes with Tl+ are less stable than the complexes with Rb+.

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