Synthesis of neutral gold(III) pyrimidine-complexes and theoretical studies on the proton affinity of the coordinated ligands
作者:Marco Bortoluzzi、Bruno Pitteri
DOI:10.1016/j.poly.2010.02.028
日期:2010.5
Abstract The neutral gold(III) complexes AuCl3(pm) (pm = pyrimidine, 2-methylpyrimidine, 4-methylpyrimidine, 5-methylpyrimidine, 4,6-dimethylpyrimidine, 2-aminopyrimidine) have been synthesised and characterised. The protonaffinity (PA) values of the free and coordinated N-heterocycles have been theoretically estimated on the basis of DFT calculations. The coordination to the AuCl3 metal fragment
Gold(III) complexes with monodentate coordinated diazines: An evidence for strong electron-withdrawing effect of Au(III) ion
作者:Beata Warżajtis、Biljana Đ. Glišić、Niko S. Radulović、Urszula Rychlewska、Miloš I. Djuran
DOI:10.1016/j.poly.2014.05.009
日期:2014.9
Gold(III) complexes containing heterocyclic diazines as ligands, [AuCl3(az)], have been synthesized. Regardless of different stoichiometric ratio of the starting [AuCl4](-) complex and diazine ligand, only gold(III) complexes with monodentatly coordinated diazines have been isolated and characterized by NMR and X-ray diffraction techniques. The [AuCl3(az)] complexes with stronger heteroaromatic bases, pyridazine and pyrimidine, form isostructural crystals in which the molecules are engaged in columnar Au center dot center dot center dot Cl interactions and pi center dot center dot center dot pi it stacking within the columns, and utilize the uncoordinated nitrogen atom as an acceptor of C-H center dot center dot center dot N hydrogen bond. On the other hand, the [AuCl3(pz)] complex containing the weakest pyrazine base does not engage its uncoordinated nitrogen atom in intermolecular interactions. (C) 2014 Elsevier Ltd. All rights reserved.