Previously synthesized [(C6H11NC)2Au]PF6 and [(C6H11NC)2Au]AsF6 both display polymorphism; each has a known yellow, green-luminescent polymorph and colorless, blue-luminescent polymorph. The yellow forms of each can convert to the colorless forms upon contact with certain volatile organic vapors. However, single-crystal-to-single-crystal phase transitions have only now been observed and verified by single crystal X-ray diffraction in both the PF6- and AsF6- analogs. No solvates are incorporated in these crystals, and the vapochromic and vapoluminescent properties can be easily seen by eye. A special case of two polymorphs appearing in one single crystal has also been observed and can be methodically produced. Obtaining this rare state has provided further insight into the mechanism of conversion of these polymorphs, especially using microscopic techniques focused at the transitional interface. In addition, newly synthesized [(C6H11NC)2Au]SbF6 was crystallized and structurally determined. Although the SbF6- crystal shows no polymorphism or isostructural structures to those before, its characterization gives insight on how the varying anion can change structural properties that correlate to physical properties, such as color and luminescence.

Studies on bis(cyclohexyl isocyanide) gold(I) complexes: From examining the mechanism of vapor-induced single-crystal-to-single-crystal phase transitions to varying non-coordinating anions

2019 Spring National Meeting

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