Complementary Molecular Information on Phthalocyanine Compounds Derived From Laser Microprobe Mass Spectrometry and Micro-Raman Spectroscopy

This is the authors' abstract. We don't add key points for this paper.

Various metal phthalocyanines (Pc's) have come under study because of their optoelectric properties which make them attractive materials for fabrication of ultra-fast molecular electronic devices. Probably the most extensively investigated metal Pc is vanadyl phthalocyanine, VOPc, which has been proposed as a medium for optical storage devices and has been shown to be a photoconductor in the infrared. Several methods have been used to elucidate the relationship between molecular structure and the Pc's optical and electronic properties. The thrust of this work is to show how well laser microprobe mass spectrometry (LAMMS) and micro-Raman spectroscopy complement each other to provide information so that structural assignments can be made. The vibrational frequencies obtained from micro-Raman spectroscopy indicate molecular structure while mass spectrometry provides the mass (m/z) of the molecule along with certain features of the structure through the fragmentation process. The compounds studied are the metal-free Pc (H2PC), and the derivatives containing the divalent cations of Ni, Cu, and VO. Some of the results are illustrated here for VOPc.