Further investigation of mental tris-quinolates using spectroscopy

Structure of aluminum tris-8-hydroxyquinoline (Alq3) and other metal tris-quinolates (Mq3) in vapor deposited films in organic light emitting devices (OLEDs) is not well established due to the possibility of existing two geometric isomeric forms, meridianal and facial. We present a comparative analysis of 1H and 13C NMR of nMeq3M\u27s (n = 0, 2, 4, 5) made from thermal sublimation, in a polar as well as a non-polar solvent to investigate possible evidences for the isomer distribution, stability of the metal chelate in the presence of a polar solvent and crystal structure determination for pure Inq 3 using single-crystal x-ray diffraction studies. This work will be the first report to use 13C NMR spectroscopy to investigate nMeq3M\u27s (n = 0, 2, 4, 5). These metal chelates were found to be stable in the presence of a polar solvent and the results were shown to support the mer-isomer. Also in this work the first report of the crystal structure for Inq3 grown in gas phase is reported and it was found to have a mer-configuration