Characterization of Thiophene and of its α-Coupled Oligomers with 2 ≤ n ≤ 8 Using Multiphoton Ionization Mass Spectrometry

Abstract

Thiophene (T₁) and the all α-coupled unsubstituted oligomers T₂–T₈ were analyzed in a time-of-flight mass spectrometer using multiphoton ionization (MPI) in the wavelength range λ = 230–270 nm. The MPI spectra obtained showed no resonance enhancement in the investigated wavelength range. The molecular ion was detected as the base peak in all cases. A general fragmentation pathway is described to interpret the dominant features of the MPI-mass spectra for all oligomers. 2,5-d₂-thiophene (d₂-T₁) was investigated in order to characterize the degree of hydrogen scrambling under MPI conditions.

Keywords

Multiphoton ionization spectra thiophene-oligomers fragmentation pathways hydrogen scambling

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