Selenolate-Protected Au₃₈ Nanoclusters: Isolation and Structural Characterization

We report the isolation and structural characterization of dodecaneselenolate-protected Au₃₈ clusters (Au₃₈(SeC₁₂H₂₅)₂₄). These clusters were synthesized via the reaction of phenylethanethiolate-protected Au₃₈ clusters (Au₃₈(SC₂H₄Ph)₂₄) with didodecyldiselenide ((C₁₂H₂₅Se)₂). Characterization of the product by mass spectrometry and thermogravimetric analysis confirmed that highly pure Au₃₈(SeC₁₂H₂₅)₂₄ had been obtained. The electronic and geometrical structures, bonding characteristics, and stability of the Au₃₈(SeC₁₂H₂₅)₂₄ 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.