Wednesday, 28 June 2006 - 11:15 AM
Bonanza Room A (John Ascuaga’s Nugget Casino Resort)
235

A reversible polymorphic phase change that affects the luminescence and aurophilic interactions in a gold(I) cluster complex

Emily M. Gussenhoven, James C. Fettinger, David M. Pham, Mark A. Malwitz, and Alan L. Balch. University of California, Davis, CA

            We are synthesizing stable, crystalline systems containing gold(I) aggregates and exploring their supramolecular structures and interactions in hopes of obtaining molecular sensors.1,2  Colorless, orange-red, luminescent complexes, 2{[μ3-S(AuCNR)3](EF6)} (R = C6H11, C7H13; E = P, As, Sb), are afforded in high yields from treatment of aqueous solutions of Na3[Au(S2O3)2] with [Au(CNR)2](EF6) in acetone.  The [Au(S2O3)2]3- anion has the ability to release S2- and facilitate the formation of these new gold(I) sulfido clusters.  Single-crystal X-ray diffraction studies showed that 2{[μ3-S(AuCNC7H13)3](SbF6)} undergoes a reversible, polymorphic phase change upon cooling.  This temperature-dependent phase change is accompanied by dramatic alterations in the aurophilic (Au∙∙∙Au) separations.  In addition, the corresponding photophysical properties are also impacted by the polymorphism, as observed in the solid-state luminescence.  These findings will be presented as well as the contrasting behavior uncovered for 2{[μ3-S(AuCNC6H11)3](PF6)}.

 

  1. Gussenhoven, E. M.; Fettinger, J. C.; Pham, D. M.; Malwitz, M. A.; Balch, A. L. J. Am. Chem. Soc. 2005, 127, 10838.
  2. White-Morris, R. L.; Olmstead, M. M.; Balch, A. L. Inorg. Chem. 2003, 42, 6741.


Back to Luminescence in Transition Metal Complexes (Invited and Contributed Speakers)
Back to The 61st Northwest Regional Meeting (June 25 - 28, 2006)