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Abstract
Issue Title: Repeat MALDI MS imaging of single tissue sections/Dielectric barrier discharge ionization mass spectrometry/Application of graphene for the analysis of pharmaceuticals/"Do it yourself" reference materials for δ 13C determinations
The chemical transformation of the polar chloroaluminum phthalocyanine, AlClPc, to [mu]-(oxo)bis(phthalocyaninato)aluminum(III), (PcAl)^sub 2^O, in thin films on indium tin oxide is studied and its influence on the molecular orientation is discussed. The studies were conducted using complementary spectroscopic techniques: Raman spectroscopy, X-ray photoelectron spectroscopy, and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. In addition, density functional theory calculations were performed in order to identify specific vibrations and to monitor the product formation. The thin films of AlClPc were annealed in controlled environmental conditions to obtain (PcAl)^sub 2^O. It is shown that the chemical transformation in the thin films can proceed only in the presence of water. The influence of the reaction and the annealing on the molecular orientation was studied with Raman spectroscopy and NEXAFS spectroscopy in total electron yield and partial electron yield modes. The comparison of the results obtained from these techniques allows the determination of the molecular orientation of the film as a function of the probing depth.
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