FAB mass spectrometry of Au25(SR)18 nanoparticles

Analytical Chemistry
Amala DassRoyce W Murray

Abstract

The molecular ion of the nanoparticle Au 25(SCH 2CH 2Ph) 18 (A 25(SR) 18) is observed at 7394 Da in fast atom bombardment (FAB, Xe atoms) ionization mass spectrometry using a 3-nitrobenzyl alcohol matrix. A distinctive pattern of positive fragment ions is evident in the mass interval 5225-7394 Da, where peaks are seen for successive mass losses equivalent to R 2S entities. Because the Au 25(SCH 2CH 2Ph) 18 nanoparticle structure is crystallographically known to consist of a centered Au 13 icosahedral core surrounded by six Au 2(SR) 3 semirings, the R 2S loses are proposed to represent serial rearrangements and decompositions of the semiring structures. Mass losses equivalent to R 2S 2 and R 2 entities also appear at the lower end of this mass interval. The most intense spectral peak, at m/ z = 5246 Da, is assigned to the fragment Au 25S 10, from which all of the CH 2CH 2Ph organic units have been cleaved but from which no gold atoms have been lost. A different pattern of fragmentation is observed at lower masses, producing ions corresponding to serial losses of one gold atom and varied numbers of sulfur atoms, which continues down to a Au 9S 2 fragment. FAB mass spectra of the Au nanoparticle are much easier to interpret than l...Continue Reading

References

Mar 29, 2000·Accounts of Chemical Research·A C TempletonR W Murray
May 13, 2004·Journal of the American Chemical Society·Dongil LeeRoyce W Murray
Jan 20, 2005·Journal of the American Chemical Society·Gangli WangRalph G Nuzzo
Feb 24, 2005·Journal of the American Chemical Society·Rui GuoRoyce W Murray
May 5, 2007·Journal of the American Chemical Society·Joseph B TracyRoyce W Murray
Oct 20, 2007·Science·Pablo D JadzinskyRoger D Kornberg
Mar 7, 2008·Journal of the American Chemical Society·Michael W HeavenRoyce W Murray
Mar 7, 2008·Journal of the American Chemical Society·Jaakko AkolaHenrik Grönbeck
Apr 15, 2008·Journal of the American Chemical Society·Manzhou ZhuRongchao Jin

❮ Previous
Next ❯

Citations

Nov 17, 2009·Analytical and Bioanalytical Chemistry·Bo YanRichard W Vachet
Jul 26, 2012·Journal of the American Chemical Society·Brian M Barngrover, Christine M Aikens
Sep 10, 2009·Journal of the American Chemical Society·Christina A Fields-ZinnaRoyce W Murray
Jul 26, 2011·The Journal of Physical Chemistry. a·Tommi T JärviWilliam A Goddard
Sep 18, 2013·The Journal of Physical Chemistry. a·Gyun-Tack Bae, Christine M Aikens
Jun 19, 2012·Nanoscale·Jie ZhengJinbin Liu
May 12, 2009·Angewandte Chemie·Wei Chen, Shaowei Chen
May 5, 2010·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Chen ZhouJie Zheng
Aug 25, 2010·ACS Nano·Laurence A AngelAmala Dass
Jul 6, 2010·Accounts of Chemical Research·Joseph F ParkerRoyce W Murray
Nov 21, 2013·Journal of the American Chemical Society·Chunyan LiuXiao Cheng Zeng
Jan 29, 2011·ACS Nano·Yong PeiXiao Cheng Zeng

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.