Selenolate-Protected Au<sub>38</sub> Nanoclusters: Isolation and Structural Characterization

We report the isolation and structural characterization of dodecaneselenolate-protected Au<sub>38</sub> clusters (Au<sub>38</sub>(SeC<sub>12</sub>H<sub>25</sub>)<sub>24</sub>). These clusters were synthesized via the reaction of phenylethanethiolate-protected Au<sub>38</sub> clusters (Au<sub>38</sub>(SC<sub>2</sub>H<sub>4</sub>Ph)<sub>24</sub>) with didodecyldiselenide ((C<sub>12</sub>H<sub>25</sub>Se)<sub>2</sub>). Characterization of the product by mass spectrometry and thermogravimetric analysis confirmed that highly pure Au<sub>38</sub>(SeC<sub>12</sub>H<sub>25</sub>)<sub>24</sub> had been obtained. The electronic and geometrical structures, bonding characteristics, and stability of the Au<sub>38</sub>(SeC<sub>12</sub>H<sub>25</sub>)<sub>24</sub> clusters were assessed using extended X-ray fine structure and X-ray absorption near edge structure measurements, optical absorption spectroscopy, electrochemical measurements, and stability testing.