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Published on: October 4, 2011
Isolation, structure, and stability of a dodecanethiolate-protected Pd(1)Au(24) cluster
Yuichi Negishi1, Wataru Kurashige, Yoshiki Niihori
1Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan. negishi@rs.kagu.tus.ac.jp
This study reports the successful isolation of a novel palladium-doped gold cluster, Pd(1)Au(24)(SC(12)H(25))(18). This unique bimetal cluster exhibits enhanced stability compared to its undoped counterpart, Au(25)(SR)(18).
Area of Science:
- Nanomaterials Science
- Inorganic Chemistry
- Surface Chemistry
Background:
- Gold clusters, specifically Au(25)(SR)(18), are well-understood magic clusters.
- Bimetal clusters offer opportunities for tuning properties beyond those of monometallic clusters.
Purpose of the Study:
- To synthesize and isolate a mono-palladium-doped gold cluster, Pd(1)Au(24)(SC(12)H(25))(18).
- To characterize the structure and stability of the Pd-doped gold cluster.
- To investigate the effect of central atom doping on cluster stability.
Main Methods:
- Synthesis of dodecanethiolate-protected palladium-gold bimetal clusters.
- Isolation of the target cluster using solvent fractionation and high-performance liquid chromatography (HPLC).
- Characterization via LDI mass spectrometry, elemental analysis, and optical absorption spectroscopy.
Main Results:
- High-purity isolation of the neutral [Pd(1)Au(24)(SC(12)H(25))(18)](0) cluster was achieved.
- The cluster possesses a core-shell structure, [Pd(1)@Au(24)(SC(12)H(25))(18)](0), with palladium at the center.
- The Pd-doped cluster demonstrated superior stability against degradation and laser dissociation compared to Au(25)(SC(12)H(25))(18).
Conclusions:
- Central atom doping is an effective strategy for enhancing the stability of gold clusters.
- The core-shell [Pd(1)@Au(24)(SC(12)H(25))(18)](0) structure contributes to its increased robustness.
- This work opens avenues for designing more stable nanomaterials through precise doping strategies.
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