Analysis of the xylenol isomers by femtosecond laser time of flight mass spectrometry

Abstract

Xylenol is a phenolic chemical substance having two methyl groups and one hydroxyl group attached to a benzene ring and has six isomers. 2,4-xylenol is the only isomer of the xylenol molecule that is in the liquid phase while the remaining isomers are all in crystal form at room temperature. In the scope of this study, we have experimentally investigated ionization and dissociation properties of xylenol isomers. All experiments were carried out by using a time of flight mass spectrometry (TOF-MS) system coupled with a femtosecond laser system. The laser pulse power-dependent multiphoton ionization of xylenol isomers was investigated by using IR (800 nm) femtosecond laser pulses having a pulse width of ∼90 fs in duration and laser intensities changing from 2.6 × 1013 to 2.6 × 1014 W/cm2. Theoretically, molecular orbitals (LUMO+1, LUMO, HOMO, HOMO–1), vertical and adiabatic ionization energies were calculated using density functional theory (DFT) with B3LYP functional and 6–311++G(d,p) basis set by following geometry optimization and performing conformational analysis.

Theoretical Investigation of the Molecular Properties of the Fluoroaniline and Fluoroanisole Isomers

“…To compare these results with another methodology, vertical and adiabatic ionization energy parameters were investigated by constructing the singly charged cation radicals. Similar methodologies have been applied for the xylene isomers (Kepceoglu, Gundogdu, Dereli, & Kilic, 2019) and xylenol isomers (Kepceoğlu, Köklü, Gündoğdu, Dereli, & Kilic, 2018).…”

Theoretical Investigation of the Molecular Properties of the Fluoroaniline and Fluoroanisole Isomers

“…To compare these results with another methodology, vertical and adiabatic ionization energy parameters were investigated by constructing the singly charged cation radicals. Similar methodologies have been applied for the xylene isomers (Kepceoglu, Gundogdu, Dereli, & Kilic, 2019) and xylenol isomers (Kepceoğlu, Köklü, Gündoğdu, Dereli, & Kilic, 2018).…”