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The effect of partially deiodination on the structure of periodinated closo-dodecaborate probed by infrared photodissociation spectroscopy

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons85129

Esser,  Tim
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Zitation

Esser, T. (2013). The effect of partially deiodination on the structure of periodinated closo-dodecaborate probed by infrared photodissociation spectroscopy. Master Thesis, Freie Universität, Berlin.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0014-6334-8
Zusammenfassung
Perhalogenated closo-dodecaborates [B12X12]2- (X = F, Cl, Br, I) play a key role in room temperature ionic liquids, electrolytes for lithium ion batteries, and stabilization of multiply charged cations. The central goal of this master thesis is to spectroscopically test predicted changes in the structure of the B12-icosahedron, found in the periodinated closo-dodecaborate [B12I12]2- upon partially deiodination. To this end, infrared photodissociation (IR-PD) spectra are measured using an ion-trap triple mass spectrometer. In order to simplify the acquisition of the IR-PD spectra, a genetic algorithm is implemented to automate the optimization of the ion optics, because manual optimization of these voltages, in particular for the ion-trap, is typically very tedious and time-consuming. [B12I12]2- clusters are brought into the gas phase by electrospray ionization, and the singly-charged fragment ions [B12In]- (n = 5-11) are produced by collisioninduced dissociation. The IR-PD spectra of [B12I12]2- and [B12In]- (n = 7-9) are assigned on the basis of electronic structure calculations and provide unambiguous evidence that cage-opening occurs in between n = 8 and n = 7.