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Nanoparticle MALDI-TOF Mass Spectrometry without Fragmentation: Au25(SCH2CH2Ph)18 and Mixed Monolayer Au25(SCH2CH2Ph)18−x(L)x
Abstract
Intact molecular ions of the organothiolate-protected nanoparticle Au25(SCH2CH2Ph)18, including their isotopic resolution, can be observed at 7391 Da as 1- and 1+ ions in negative and positive mode, respectively, by MALDI-TOF mass spectrometry when using a tactic of threshold laser pulse intensities and trans-2-[3-(4-tert-butylphenyl)-2-methyl-2-propenylidene]malononitrile (DCTB) as matrix. Previous MALDI-TOF studies of Au nanoparticles using other matrices have encountered extensive fragmentation of nanoparticle as well as thiolate ligands. Absence of fragmentation enables precise determination of the distribution of mixed monolayer compositions on nanoparticles prepared by ligand exchange reactions and by synthesis using thiol mixtures. Reaction conditions producing mixed monolayers containing only one or a small number of usefully functional ligands can be readily identified. At increased laser pulse intensity, the first fragmentation step(s) for the Au25(SCH 2CH2Ph)18 nanoparticle results in losses of AuL units and, in particular, loss of Au4(SCH2CH2Ph)4.
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Cited by
Sub-nanometre sized metal clusters: from synthetic challenges to the unique property discoveries
Lu, Y., & Chen, W. (2012) · Chemical Society Reviews · doi:10.1039/c2cs15325d · Cited by 1,152
The Story of a Monodisperse Gold Nanoparticle: Au25L18
Parker, J. F., Fields-Zinna, C. A., & Murray, R. W. (2010) · Accounts of Chemical Research · doi:10.1021/ar100048c · Cited by 503
Self-citationTransformation Chemistry of Gold Nanoclusters: From One Stable Size to Another
Zeng, C., Chen, Y., Das, A., & Jin, R. (2015) · The Journal of Physical Chemistry Letters · doi:10.1021/acs.jpclett.5b01150 · Cited by 258
Metadata
- Authors
- Dass, A., Stevenson, A., Dubay, G. R., Tracy, J. B., & Murray, R. W.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-04-08
- Volume
- 130
- Issue
- 18
- Pages
- 5940-5946
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W1982981507
- Cited by
- 336
- References
- 0
- FWCI
- 12.46
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Nanoparticle MALDI-TOF Mass Spectrometry without Fragmentation: Au25(SCH2CH2Ph)18 and Mixed Monolayer Au25(SCH2CH2Ph)18−x(L)x. https://app.cochat.ai/papers/10.1021/ja710323t
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- Dass, A., Stevenson, A., Dubay, G. R., Tracy, J. B., & Murray, R. W. (2008). Nanoparticle MALDI-TOF Mass Spectrometry without Fragmentation: Au25(SCH2CH2Ph)18 and Mixed Monolayer Au25(SCH2CH2Ph)18−x(L)x. Journal of the American Chemical Society. https://doi.org/10.1021/ja710323t
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