Size-selective Pt siderophores based on redox active azo-aromatic ligands
We demonstrate a strategy inspired by natural siderophores for the dissolution of platinum nanoparticles that could enable their size-selective synthesis, toxicological assessment, and the recycling of this precious metal. From the fabrication of electronics to biomedical diagnosis and therapy, PtNP...
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Published in | Chemical science (Cambridge) Vol. 11; no. 34; pp. 9226 - 9236 |
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Main Authors | , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Cambridge
Royal Society of Chemistry
14.09.2020
The Royal Society of Chemistry |
Subjects | |
Online Access | Get full text |
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Summary: | We demonstrate a strategy inspired by natural siderophores for the dissolution of platinum nanoparticles that could enable their size-selective synthesis, toxicological assessment, and the recycling of this precious metal. From the fabrication of electronics to biomedical diagnosis and therapy, PtNPs find increasing use. Mitigating concerns over potential human toxicity and the need to recover precious metal from industrial debris motivates the study of bio-friendly reagents to replace traditional harsh etchants. Herein, we report a family of redox-active siderophore-viz. π-acceptor azo aromatic ligands (L) that spontaneously ionize and chelate Pt atoms selectively from nanoparticles of size ≤6 nm. The reaction produces a monometallic diradical complex, Pt
II
(L&z.rad;
−
)
2
, isolated as a pure crystalline compound. Density functional theory provides fundamental insights on the size dependent PtNP chemical reactivity. The reported findings reveal a generalized platform for designing π-acceptor ligands to adjust the size threshold for dissolution of Pt or other noble metals NPs. Our approach may, for example, be used for the generation of Pt-based therapeutics or for reclamation of Pt nano debris formed in catalytic converters or electronic fabrication industries.
Biofriendly recycling of Pt is enabled by ligands that size-selectively dissolve nanoclusters. |
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Bibliography: | Electronic supplementary information (ESI) available. CCDC For ESI and crystallographic data in CIF or other electronic format see DOI 1042504 10.1039/d0sc02683b ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Present address: Department of Chemistry and Biochemistry, University of Texas at El Paso, El Paso, Texas 79968, United States. DS, Sreetosh Goswami and RB contributed equally to this work. |
ISSN: | 2041-6520 2041-6539 |
DOI: | 10.1039/d0sc02683b |