Synthesis and Characterization of Luminescent Gold(III) Complexes

Download or read book Synthesis and Characterization of Luminescent Gold(III) Complexes written by Amanda N. Sulicz and published by . This book was released on 2017 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chemistry of cyclometalated gold(III) has been relatively slow to emerge, but recent advances in catalyst and material design have driven a renewed interest. Reported here are synthetic, structural, and optical studies of cyclometalated gold(III) aryl complexes. These new complexes show ligand-centered luminescence that is perturbed by the heavy-atom effect of gold. Traditionally, metal-carbon bond formation relied on organometallic complexes of electropositive elements, including lithium and magnesium. The easily reducible nature of gold(III) often interferes with these conventional reagents, thus resulting in the use of toxic metals like mercury or thallium. Reported here is the use of palladium-catalyzed Suzuki-Miyaura cross-coupling for the attachment of aryl ligands to cyclometalated gold(III) chloride complexes. The resulting di- and mono-arylated species were luminescent. Several complexes have been crystallographically characterized. Luminescent derivatives of a previously published gold(III) chloro precursor, initially reported for catalytic purposes, were prepared through boron transmetalation reactions. Complexes bearing both aryl and cyanide ligands were synthesized. These luminescent materials are diamagnetic and were be characterized by multinuclear NMR, absorption and emission spectroscopies (including time-resolved emission), and by X-ray diffraction crystallography. The synthesized gold(I) complexes were designed to display reverse saturable absorption and be a two photon acceptor. The BTF (BTF = 2-(9,9’-diethyl-9H-fluoren-2-yl)-benzothiazole) ligand was chosen as it has been previously demonstrated to have favorable photophysical effects on platinum(II) and ruthenium(II) complexes for applications in photodynamic therapy and optical power limiting (OPL). Gold(I) complexes with the BTF ligand are sought for potential OPL applications. Synthesized complexes are luminescent and were characterized by multinuclear NMR, absorption and emission spectroscopies, photoluminescent quantum yields, time-resolved emission. Two complexes were crystallographically characterized.