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The structural and thermal behavior of photoluminescent Au(I)−alkanethiolate was investigated by using differential scanning calorimetry, spectrofluorophotometer, FT-IR spectroscopy, NMR spectroscopy, X-ray diffraction, and transmission electron microscopy. Upon heating the sample, the conformation of the alkyl groups in Au(I)−alkanethiolate changed from the initial all-trans state at room temperature to the gauche containing disorder state along with the decrease of emission intensity, and then Au(I)−alkanethiolate changed to a mixture of di- n -alkyl disulfide, di- n -alkyl sulfide, and gold nanoparticles stabilized by the n -alkanethiolates. Carboxylic acid and ester functionalized gold nanoparticles can be easily obtained from this simple one-step heating process, using the corresponding functionalized Au(I)−thiolates without any solvent, surfactants, or chemical reagents.
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Cha et al. (2008) studied this question.
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