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A Benchtop Method for Appending Protic Functional Groups to N-Heterocyclic Carbene Protected Gold Nanoparticles |
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| Authors: | Dr Joseph F DeJesus Lindy M Sherman Darius J Yohannan Jeffrey C Becca Shelby L Strausser Leonhard F P Karger Dr Lasse Jensen Dr David M Jenkins Dr Jon P Camden |
| Institution: | 1. Department of Chemistry, University of Tennessee, Knoxville, TN, 37996 USA
These authors contributed equally to this work.;2. Department of Chemistry and Biochemistry, University of Notre Dame, South Bend, IN, 46556 USA These authors contributed equally to this work.;3. Department of Chemistry and Biochemistry, University of Notre Dame, South Bend, IN, 46556 USA;4. Department of Chemistry, The Pennsylvania State University, University Park, PA, 16802 USA;5. Department of Chemistry, University of Tennessee, Knoxville, TN, 37996 USA |
| Abstract: | The remarkable resilience of N-heterocyclic carbene (NHC) gold bonds has quickly made NHCs the ligand of choice when functionalizing gold surfaces. Despite rapid progress using deposition from free or CO2-protected NHCs, synthetic challenges hinder the functionalization of NHC surfaces with protic functional groups, such as alcohols and amines, particularly on larger nanoparticles. Here, we synthesize NHC-functionalized gold surfaces from gold(I) NHC complexes and aqueous nanoparticles without the need for additional reagents, enabling otherwise difficult functional groups to be appended to the carbene. The resilience of the NHC−Au bond allows for multi-step post-synthetic modification. Beginning with the nitro-NHC, we form an amine-NHC terminated surface, which further undergoes amide coupling with carboxylic acids. The simplicity of this approach, its compatibility with aqueous nanoparticle solutions, and its ability to yield protic functionality, greatly expands the potential of NHC-functionalized noble metal surfaces. |
| Keywords: | Gold Nanopartikel N-Heterocyclische Carbene SERS Oberflächenmodifikation |