title: Synthesis and characterization of novel gold(III) complexes of asymmetrically aryl-substituted 1,2-dithiolene ligands featuring potential-controlled spectroscopic properties.
abstract: The tetrabutylammonium (TBA(+)) salts of square-planar monoanionic gold complexes of the unsymmetrically substituted Ar,H-edt(2-) 1,2-dithiolene ligands (Ar,H-edt(2-)=arylethylene-1,2-dithiolato; Ar=phenyl (1(-)), 2-naphthyl (2(-)), and 1-pyrenyl (3(-))) were synthesized and characterized by spectroscopic and electrochemical methods and the corresponding neutral species (1, 2, and 3, respectively) were obtained in CH(2)Cl(2) solution at room temperature by diiodine oxidation. The single-crystal X-ray diffraction structural data collected for (TBA(+))(2(-)), supported by DFT theoretical calculations, are consistent with the ene-1,2-dithiolate form of the ligand and the Au(III) oxidation state. All complexes feature intense near-IR absorptions (at about 1.5 microm) in their neutral states and Vis-emitting properties in the 400-550 nm range, the energy of which is controlled by the charge of the complex in the case of the 3(-)/3 couple. The spectroscopic and electrochemical features of 1(x-) and 2(x-) (x=0, 1), both in their cis and trans conformations, were investigated by means of DFT and time-dependent (TD) DFT calculations.
authors.affiliation: Dipartimento di Chimica Inorganica ed Analitica, Università degli Studi di Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato-Cagliari, Italy.
authors.forename: Lucia
authors.initials: L
authors.lastname: Ambrosio
authors.forename: M Carla
authors.initials: MC
authors.lastname: Aragoni
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Arca
authors.forename: Francesco A
authors.initials: FA
authors.lastname: Devillanova
authors.forename: Michael B
authors.initials: MB
authors.lastname: Hursthouse
authors.forename: Susanne L
authors.initials: SL
authors.lastname: Huth
authors.forename: Francesco
authors.initials: F
authors.lastname: Isaia
authors.forename: Vito
authors.initials: V
authors.lastname: Lippolis
authors.forename: Annalisa
authors.initials: A
authors.lastname: Mancini
authors.forename: Anna
authors.initials: A
authors.lastname: Pintus