Au22Ir3(PET)18: An Unusual Alloy Cluster through Intercluster Reaction

被引：65

作者：

Bhat, Shridevi ^{[1
,2
]}

Baksi, Ananya ^{[1
,2
]}

Mudedla, Sathish Kumar ^{[3
]}

Natarajan, Ganapati ^{[1
,2
]}

Subramanian, V. ^{[3
]}

Pradeep, Thalappil ^{[1
,2
]}

机构：

[1] Indian Inst Technol Madras, Dept Chem, DST Unit Nanosci UNS, Madras 600036, Tamil Nadu, India

[2] Indian Inst Technol Madras, Dept Chem, Themat Unit Excellence, Madras 600036, Tamil Nadu, India

[3] CSIR, Cent Leather Res Inst, Chem Lab, Madras 600020, Tamil Nadu, India

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2017年 / 8卷 / 13期

关键词：

ATOMICALLY PRECISE; GOLD NANOCLUSTERS; CRYSTAL-STRUCTURE; AU-25; NANOPARTICLES; LUMINESCENCE; STABILITY;

D O I：

10.1021/acs.jpclett.7b01052

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

An intercluster reaction between Au-25(PET)(18) and Ir-9(PET)(6) producing the alloy cluster, Au22Ir3(PET)(18) exclusively, is demonstrated where the ligand PET is 2-phenylethanethiol. Typical reactions of this kind between Au-25(PET)(18) and Ag-25(SR)(18), and other clusters reported previously, produce mixed cluster products. The cluster composition was confirmed by detailed high-resolution electrospray ionization mass spectrometry (ESI MS) and other spectroscopic techniques. This is the first example of Ir metal incorporation in a monolayer-protected noble metal cluster. The formation of a single product was confirmed by thin layer chromatography (TLC). Density functional theory (DFT) calculations suggest that the most favorable geometry of the Au22Ir3(PET)(18) cluster is one wherein the three Ir atoms are arranged triangularly with one Ir atom at the icosahedral core and the other two on the icosahedral shell. Significant contraction of the metal core was observed due to strong Ir-Ir interactions.

引用

页码：2787 / 2793

页数：7

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