6533b86ffe1ef96bd12cdd06

RESEARCH PRODUCT

Dynamic Diglyme-Mediated Self-Assembly of Gold Nanoclusters

Chongyue YiRoy H. GeissChristopher J. AckersonHannu HäkkinenKenneth L. KnappenbergerW. Scott CompelXi ChenO. Andrea Wong

subject

DimerGeneral EngineeringGeneral Physics and AstronomyNanoparticleInfrared spectroscopyDiglymedynamic assemblyDark field microscopyNanoclusterschemistry.chemical_compoundCrystallographydiglymetransient absorption spectroscopychemistryChemical physicsScanning transmission electron microscopyGeneral Materials ScienceSpectroscopyta116gold nanoclusters

description

We report the assembly of gold nanoclusters by the nonthiolate ligand diglyme into discrete and dynamic assemblies. To understand this surprising phenomenon, the assembly of Au20(SC2H4Ph)15-diglyme into Au20(SC2H4Ph)15-diglyme-Au20(SC2H4Ph)15 is explored in detail. The assembly is examined by high-angle annular dark field scanning transmission electron microscopy, size exclusion chromatography, mass spectrometry, IR spectroscopy, and calorimetry. We establish a dissociation constant for dimer to monomer conversion of 20.4 μM. Theoretical models validated by transient absorption spectroscopy predict a low-spin monomer and a high-spin dimer, with assembly enabled through weak diglyme oxygen-gold interactions. Close spatial coupling allows electron delocalization between the nanoparticle cores. The resulting assemblies thus possess optical and electronic properties that emerge as a result of assembly.

yearjournalcountryeditionlanguage
2015-11-05ACS Nano
https://doi.org/10.1021/acsnano.5b02850