Master of Science (MS)
First Committee Member
Linda S. Sapochak
Number of Pages
We present a detailed photophysical (absorption and emission), thermal and X-ray absorption (NEXAFS) study of gallium (III) bis(2-methyl-8-quinolinolato) carboxylate (2Meq2GaOR) chelates, where OR = acetato (OAc), trifluoroacetato (OTF) and dimethylpropianato (ODMP). These materials are compared with aluminum (III) tris(8-quinolinolato) (Alq3) chelates. We show that regardless of changing the carboxylato ligand the 2Meq2 GaOR chelates have similar unoccupied (LUMO) states. This implies that charge injection should be constant in these materials when used as emitter materials in organic light emitting devices. We also present the first detailed evaluation in to the mer/fac isomerization of gallium (III) tris(2-methyl-8-quinolinolato) (2Meq3Ga) chelate in both solution and solid state, using 1H NMR and thermal studies. Unlike in Alq3, where the fac-isomer is not present in detectable amounts in a thin film, in 2Meq3Ga the fac-isomer is present approximately four times in excess. We infer that the mer-isomer interconverts to the fac-isomer in the solid state and in the gas phase.
Characterization; Chelates; Gallium Methyl; Quinolinolato
Organic chemistry; Chemistry, Physical and theoretical
University of Nevada, Las Vegas
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Nanayakkara, Sanjini Ushika, "Characterization of 2-methyl-8-quinolinolato gallium (Iii) chelates" (2001). UNLV Retrospective Theses & Dissertations. 1290.