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 often 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 coupling to attach aryl ligands to cyclometalated gold(III) chloride complexes, resulting in a reliable synthesis to both di- and monoarylated species. Several complexes have been crystallographically characterized. Mixed aryl and alkynyl derivatives are sought. Luminescent derivatives of a previously published chlorogold(III) precursor, are being prepared through boron transmetalation reactions. These luminescent materials are diamagnetic and will be characterized by multinuclear NMR, absorption and emission spectroscopies (including time-resolved emission), and by X-ray diffraction crystallography when possible.

Synthesis of luminescent gold(III) cyclometalated complexes

253rd National Meeting (2017)

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