Ab initio study of thiolate-protected Au102 nanocluster

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1497-1503
Journal / PublicationACS Nano
Volume2
Issue number7
Publication statusPublished - Jul 2008
Externally publishedYes

Abstract

A total structural determination of the Au102 (p-MBA)44 nanocluster has been recently achieved via successful crystallization of the thiolated-protected gold nanocluster (Jadzinsky et al. Science 2007, 318, 430). The embedded Au102 cluster may be viewed as a multilayered structure described as Au54 (penta-star)ΑU38 (ten wings)Αu10(two pentagon caps), where the inner Au54 "penta-star" consists of five twinned Au20 tetrahedral subunits. To gain more insight into high stability of the Au102 (p-MBA)44 nanocluster, we have performed ab initio calculations to study electronic properties of a homoloque Au102 (SCH3)44 nanocluster, an Au102 (SCH3)42 nanocluster (with two SCH3 groups less), and an "effectively isoelectronic" Au104 (SCH3)46 nanocluster with a more symmetric embedded Au104 structure. Electronic structure calculations suggest that the Au102 (SCH3)44 nanocluster possesses a reasonably large gap (∼0.54 eV) between the highest occupied molecular orbital and the lowest unoccupied molecular orbital (HOMO-LUMO gap), which is comparable to the measured HOMO-LUMO gap (∼0.65 eV) of the bare Au58 cluster. Likewise, the Au104 (SCH3)46. nanocluster has a HOMO-LUMO gap of ∼0.51 eV, comparable to that of Au102 (SCH3)44 nanocluster. In contrast, the Au102 (SCH3)42 nanocluster has a zero HOMO-LUMO gap. These results confirm that high stability of the Au102 (p-MBA)44 nanocluster may be attributed in part to the electronic shell closing of effective 58 (= 102-44) valence electrons, as in the case of AU25 (SCH2 CH2Ph)18- cluster whose high stability may be attributed to the electronic shell closing of effective 8 (= 26-18) valence electrons. © 2008 American Chemical Society.

Research Area(s)

  • Gold nanoclusters, HOMO, Jellium model, LUMO gap, Shell closing, Thiolate protection

Bibliographic Note

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Citation Format(s)

Ab initio study of thiolate-protected Au102 nanocluster. / Gao, Yi; Shao, Nan; Zeng, Xiao Cheng.

In: ACS Nano, Vol. 2, No. 7, 07.2008, p. 1497-1503.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review