Synthesis and crystal structure of tetra(quinolin-8-olato)thorium ethanol solvate, Th(C9H6NO)4*C2H5OH
Abstract
Metal quinolinolates (also known as oxinates) have been widely used for gravimetric analysis and in recent days as materials for organic light emitting diodes (OLEDs). Recrystallisation of tetra(quinolin-8-olato)thorium(IV) (ThQ4) yielded yellow, translucent, prismatic crystals of the title compound, ThQ4*C2H5OH, the single-crystal structure of which is described. Only one crystallographically distinct molecule is found, all ligands are crystallographically inequivalent. Thorium is coordinated by four 8-hydroxyquinolinato with average Th-O distances of 233.3 pm and average Th-N distances of 272.4 pm, and one ethanol ligand with a Th-O distance 256.7 pm. O and N surroundings around thorium can be described by a tricapped trigonal prism. In contrast to quinolinates of the trivalent metals, ThQ4*C2H5OH does not fluoresce under UV irradiation, which is in accordance with the lack of π-π overlap in the crystal structure.
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DOI: http://dx.doi.org/10.13171/mjc.1.1.2011.27.05.13
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