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Synthesis and Characterization of Novel Gold(III) Complexes of Asymmetrically Aryl‐Substituted 1,2‐Dithiolene Ligands Featuring Potential‐Controlled Spectroscopic Properties
Author(s) -
Ambrosio Lucia,
Aragoni M. Carla,
Arca Massimiliano,
Devillanova Francesco A.,
Hursthouse Michael B.,
Huth Susanne L.,
Isaia Francesco,
Lippolis Vito,
Mancini Annalisa,
Pintus Anna
Publication year - 2010
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.200900690
Subject(s) - electrochemistry , chemistry , ligand (biochemistry) , aryl , crystallography , single crystal , crystal structure , stereochemistry , electrode , organic chemistry , biochemistry , alkyl , receptor
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 μm) 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.