Binary clusters AuPt and Au6Pt: Structure and reactivity within density functional theory

Wei Quan Tian, Maofa Ge, Fenglong Gu, Toshiki Yamada, Yuriko Aoki

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    60 Citations (Scopus)

    Abstract

    Within density functional theory with the general gradient approximation for the exchange and correlation, the bimetallic clusters AuPt and Au 6Pt have been studied for their structure and reactivity. The bond strength of AuPt lies between those of Au2 and Pt2, and it is closer to that of Au2. The Pt atom is the reactive center in both AuPt and AuPt+ according to electronic structure analysis. AuPt + is more stable than AuPt. Au6Pt prefers electronic states with low multiplicity. The most stable conformation of Au6Pt is a singlet and has quasi-planar hexagonal frame with Pt lying at the hexagonal center. The doping of Pt in Au cluster enhances the chemical regioselectivity of the Au cluster. The Pt atom essentially serves as electron donor and the Au atoms bonded to the Pt atom acts as electron acceptor in Au6Pt. The lowest triplet of edge-capped rhombus Au6Pt clusters is readily accessible with very small singlet - triplet energy gap (0.32 eV). O2 prefers to adsorb on Au and CO prefers to adsorb on Pt. O2 and CO have stronger adsorption on AuPt than they do on Au6Pt. CO has a much stronger adsorption on AuPt bimetallic cluster than O2 does. The adsorption of CO on Pt modifies the geometry of AuPt bimetallic clusters.

    Original languageEnglish
    Pages (from-to)6285-6293
    Number of pages9
    JournalJournal of Physical Chemistry A
    Volume110
    Issue number19
    DOIs
    Publication statusPublished - May 18 2006

    All Science Journal Classification (ASJC) codes

    • Physical and Theoretical Chemistry

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