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Structural Isomerism

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...

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Updated: Feb 22, 2026

Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications

Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications

Published on: March 22, 2020

The fcc structure isomerization in gold nanoclusters.

Shengli Zhuang¹, Lingwen Liao, Man-Bo Li

¹Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, CAS Center for Excellence in Nanoscience, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China. zkwu@issp.ac.cn.

|September 29, 2017

Summary

Researchers synthesized a novel gold nanocluster, Au52(PET)32, exhibiting a unique fcc structure isomerization. This structural change, unlike previous findings, results in distinct UV/vis/NIR absorption properties.

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Last Updated: Feb 22, 2026

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Area of Science:

* Nanoparticle Chemistry
* Materials Science
* Physical Chemistry

Background:

* Structural isomerization is a key concept in organic chemistry.
* This phenomenon has recently been observed in thiolated gold nanoparticles.
* Previous studies have not reported isomerization involving changes to the cluster's kernel structure while maintaining face-centered cubic (fcc) packing.

Purpose of the Study:

* To report the synthesis and structural characterization of a novel gold nanocluster exhibiting unique fcc structure isomerization.
* To investigate the impact of this isomerization on the optical properties of the gold nanocluster.
* To identify novel structural features within the gold nanocluster kernel.

Main Methods:

* Synthesis of a novel gold nanocluster, Au52(PET)32, using phenylethanethiolate (PET).
* Determination of the atomic structure of the synthesized gold nanocluster.
* Characterization of the UV/vis/NIR absorption spectra of the novel nanocluster.

Main Results:

* A novel gold nanocluster, Au52(PET)32, was synthesized with the same Au/S molar ratio as Au52(TBBT)32 but a different fcc structure.
* The Au52(PET)32 nanocluster displayed significantly different UV/vis/NIR absorption compared to Au52(TBBT)32 due to fcc structure isomerization.
* The kernel of Au52(PET)32 was found to possess high-indexed (311)-like facets, a previously unreported feature in gold nanoclusters.

Conclusions:

* The study successfully demonstrates a novel type of structural isomerization in gold nanoclusters where the kernel structure changes while maintaining fcc packing.
* The observed fcc structure isomerization in Au52(PET)32 leads to distinct optical properties, highlighting the sensitivity of these nanoparticles to structural variations.
* The discovery of (311)-like facets in the Au52(PET)32 kernel opens new avenues for understanding and designing gold nanoclusters with tailored functionalities.