am7b12465_si_005.cif (6.41 MB)
Halide Effects on the Sublimation Temperature of X–Au–L Complexes: Implications for Their Use as Precursors in Vapor Phase Deposition Methods
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posted on 2017-11-02, 00:00 authored by Will G. Carden, Jakub Pedziwiatr, Khalil A. Abboud, Lisa McElwee-WhiteTrends
in volatility with changes in the halide ligand were established for
gold(I) complexes of the type X–Au–L [X = Cl, Br, I;
L = CNtBu, CNMe, PMe3, P(NMe2)3, P(OCH2CF3)3] by determining
the temperatures for the onset of sublimation (Tsub) at a fixed pressure. Within each series of isocyanide
complexes, Tsub decreases with increasing
atomic radius of the halide, making the iodide complex the most volatile.
For the phosphine and phosphoramidate complexes, the chloride and
bromide have similar Tsub values with
the bromide slightly higher, but the iodide complex is again the most
volatile of the three. The trends in volatility can be correlated
to variation in Au–Au bond distances and aggregation patterns
in the solid state structures. For the P(OCH2CF3)3 complexes, melting occurred before sublimation, but
the iodide complex was still more volatile than the bromide. These
trends have implications for the use of these complexes in electron
beam induced deposition and chemical vapor deposition, for which precursor
volatility is important.
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chemical vapor depositionT sub decreasesT subPMe 3trend3 complexesisocyanide complexesaggregation patternselectron beamCN t BuVapor Phase Deposition Methods TrendsT sub valuesbromideprecursor volatilityiodideCFhalide ligandSublimation Temperaturephosphoramidate complexesstate structuressublimationHalide Effects