Green Gold: Au30(S-t-C4H9)18 Molecules

被引：49

作者：

Crasto, David ^{[1
]}

Dass, Amala ^{[1
]}

机构：

[1] Univ Mississippi, Dept Chem & Biochem, University, MS 38677 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 42期

基金：

美国国家科学基金会;

关键词：

OPTICAL-ABSORPTION SPECTRA; ELECTRONIC-PROPERTIES; MASS-SPECTROMETRY; CLUSTERS; AU-25(SCH2CH2PH)(18); NANOPARTICLES; STABILITY; LIGANDS; SCALE; AU;

D O I：

10.1021/jp407341y

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：

Here, we report the synthesis and separation of Au-30(tert-thiol)(18) (tert-thiol = tert-butanethiol and 1-adamantanethiol) from a mixture of sizes of bulky-ligated nanoparticles. With precisely 30 gold metal atoms and 18 tertiary butyl ligands, this new 30 Au atom molecule is assigned a formula based on results obtained in high-resolution electrospray ionization (ESI) mass spectrometry. UV-vis-NIR spectroscopy shows a distinct electronic transition featured at 620 nm, with a valley in the green wavelength 520-570 nm region, explaining the green appearance. This lack of absorbance in the green region is uncommon, and therefore, metal nanoparticles of green color are extremely rare. Its optical band gap, 1.76 eV is much different than the 1.3 eV reported for Au-25(SR)(18). We report its reproducible direct synthesis (similar to 10 mg) in a one-pot reaction, with two different ligands. Because of the unique optical properties and altered-discrete sizes, there is a fundamental need for structural analysis of this nanoparticle.

引用

页码：22094 / 22097

页数：4

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