A newly developed, environmentally benign palladium catalyst supported on gallium arsenide, {Pd}‐S‐GaAs(001), has both the lowest recorded leaching and high recyclability for Suzuki–Miyaura coupling. Measurements of the catalyst surface by synchrotron radiation X‐ray photoelectron spectroscopy show a relationship between the surface and the activity of the catalyst. Since {Pd}‐S‐GaAs(001) makes efficient use of the rare metal Pd, it is a useful palladium catalyst from an atom‐ economical perspective. Two heterogeneity tests clarify that the presence of immobilized palladium on SGaAs is important for higher catalytic activity.
We present studies on the structure and chemical states of a catalyst developed by immobilizing palladium on S-terminated GaAs͑001͒. Hard x-ray photoelectron spectroscopy ͑HX-PES͒ of core-level and valence band photoemission consistently indicates that the organopalladium molecules are reduced on the surface yielding Pd nanoparticles with a metallic nature. This finding is supported by high-resolution observations using scanning electron microscopy and backscattered electron image. HX-PES results also reveal that a portion of S atoms forming the S-termination is oxidized during the formation of Pd nanoparticles.
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