478932-77-3Relevant academic research and scientific papers
Synthesis of cyano(selenone)gold(I) complexes and investigation of their scrambling reactions using 13C and 15N NMR spectroscopy
Ahmad, Saeed,Isab, Anvarhusein A.,Al-Arfaj, Abdul Rahman,Arnold, Alan P.
, p. 2099 - 2105 (2008/10/08)
A number of new cyano(selenone)gold(I) complexes have been prepared and characterized by elemental analysis, IR and NMR methods for a series of selenones (imidazolidine-2-selenone and its derivatives or diazinane-2-selenone). It appears from the IR data two of the seven prepared complexes exist as nonionic complexes, [>C=Se-Au-CN] while the remaining five exist as the ionic species, [Au(>C=Se)2]+[Au(CN)2]- in the solid state. In solution, all complexes are observed to undergo ligand scrambling reactions exhibiting the equilibrium, 2 [>C=Se-Au-CN]?[>C=Se)2Au]++[Au (CN)2]-. Ligand scrambling reactions of the complexes have been studied in DMSO using 13C and 15N NMR spectroscopy. As a result of the scrambling reaction two sharp resonances are observed in all complexes for both the carbon and nitrogen of CN- in 13C and 15N NMR, respectively, corresponding to the two equilibrium components, [>C=Se-Au-CN] and [Au(CN)2]-. Equilibrium constants (Keq) were determined for the scrambling equilibria by integrating the CN- resonances in the 13C NMR, recorded at 297 K. Keq values obtained for cyano(selenone)gold(I) complexes are the highest of all the reported values, measured for other complexes.
