M4Au12Ag32(p-MBA)(30) (M = Na, Cs) bimetallic monolayer-protected clusters: synthesis and structure

被引：6

作者：

Conn, Brian E. ^{[1
]}

Bhattarai, Badri ^{[1
]}

Atnagulov, Aydar ^{[1
]}

Yoon, Bokwon ^{[2
]}

Landman, Uzi ^{[2
]}

Bigioni, Terry P. ^{[1
]}

机构：

[1] Univ Toledo, Dept Chem, Toledo, OH 43606 USA

[2] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

来源：

ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS | 2018年 / 74卷

基金：

美国国家科学基金会;

关键词：

crystal structure; silver nanoparticle; gold nanoparticle; bimetallic nanoparticle; monolayer-protected cluster; Bader analysis;

D O I：

10.1107/S2056989018008393

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Crystals of M4Au12Ag32(p-MBA)(30) bimetallic monolayer-protected clusters (MPCs), where p-MBA is p-mercaptobenzoic acid and M+ is a counter-cation (M = Na, Cs) have been grown and their structure determined. The molecular structure of triacontakis[(4-carboxylatophenyl) sulfanido] dodecagolddotriacontasilver, Au12Ag32(C7H5O2S)(30) or C210H150Ag32Au12O60S30, exhibits point group symmetry (3) over bar at 100 K. The overall diameter of the MPC is approximately 28 angstrom, while the diameter of the Au12Ag20 metallic core is 9 angstrom. The structure displays ligand bundling and intermolecular hydrogen bonding, which gives rise to a framework structure with 52% solvent-filled void space. The positions of the M+ cations and the DMF solvent molecules within the void space of the crystal could not be determined. Three out of the five crystallographically independent ligands in the asymmetric unit cell are disordered over two sets of sites. Comparisons are made to the all-silver M4Ag44(p-MBA)(30) MPCs and to expectations based on density functional theory.

引用

页码：987 / +

页数：19

共 29 条

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