Trinuclear anionic gold

Similar observations were made with bis[alkoxy(alkylamino)carbene]gold complexes, which are prepared by ring opening of trinuclear precursors with trifluoromethanesulfonic (triflic) acid. Through anion metathesis, several crystalline forms were obtained, the structures of which were determined. The triflate salt has a chain of cations in the crystal, while the chloroform solvate of a />-benzoquinolate contains only monomeric cations. In the solvent-free crystals, dimers are present (Scheme 59).251... 

Tong et al. also have found that the appearance of high emission or low emission bands for trinuclear Au(i) complexes [Au3(dcmp)2]X3 (dcmp -bis(dicyclohexylphosphinomethyl)-cyclohe Q lphosphine) (HOMO and LUMO orbitals are plotted in Fig. 6b) is depending on the counter ion X and whether this has close contact or no contact to the complex. DFT calculations assign the emission bands to the three-coordinate Au(i) chain and show that the spectroscopic properties are affected by aurophilic interactions (Au-Au distances of about 3.0 to 3.1 A). DFT calculations of two- to four-nuclear coordinated model complexes present evidence that both absorption and emission enei es are inversely proportional to the number of Au(i) atoms if gold-anion contacts are not close. ... 

---