99350-06-8Relevant academic research and scientific papers
Steric effects and aurophilic interactions in crystals of Au2(μ-1,2-bis(diphenylphosphino)ethane)X2and Au2(μ-1,2-bis(dicyclohexylphosphino)ethane)X2(X?=?Cl, Br, I)
Walters, Daniel T.,England, Kellie R.,Ghiassi, Kamran B.,Semma, Fikerete Z.,Olmstead, Marilyn M.,Balch, Alan L.
, p. 535 - 541 (2016)
Crystals in the isostructural series Au2(μ-dppe)X2(dppe is 1,2-bis(diphenylphosphino)ethane, X?=?Cl, Br, I) form centrosymmetric, dimeric structures with two short Au?Au contacts between the component molecules. We found no evidence for a second polymorph for any member of the Au2(μ-dppe)X2series, although two polymorphs were observed previously for the related Au2(Ph2As(CH2)2AsPh2)X2series. Crystals of Au2(μ-dcpe)X2(where dcpe is 1,2-bis(dicyclohexylphosphino)ethane) show structures that differ appreciably from those of Au2(μ-dppe)X2. The bulky cyclohexyl substituents appear to be playing a major role in eliminating the formation of polymeric or dimeric structures. Au2(μ-dcpe)Cl2has a monomeric structure without aurophilic interactions. In contrast, Au2(μ-dcpe)Br2and Au2(μ-dcpe)I2have similar structures with intramolecular aurophilic interactions. Au2(μ-dcpe)I2displays a form of aggregation-induced emission. It displays a red-pink luminescence in crystalline form but is non-emissive in solution.
