Dual Role of Electron-Accepting Metal-Carboxylate Ligands: Reversible Expansion of Exciton Delocalization and Passivation of Nonradiative Trap-States in Molecule-like CdSe Nanocrystals
作者： Katie N. Lawrence , Poulami Dutta , Mulpuri Nagaraju , Meghan B. Teunis , Barry B. Muhoberac
DOI: 10.1021/JACS.6B04888
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摘要: This paper reports large bathochromic shifts of up to 260 meV in both the excitonic absorption and emission peaks oleylamine (OLA)-passivated molecule-like (CdSe)34 nanocrystals caused by postsynthetic treatment with electron accepting Cd(O2CPh)2 complex at room temperature. These are found be reversible upon removal N,N,N′,N′-tetramethylethylene-1,2-diamine. 1H NMR FTIR characterizations demonstrate that OLA remained attached surface during Cd(O2CPh)2. On basis ligand characterization, X-ray powder diffraction measurements, additional control experiments, we propose these peak red a consequence delocalization confined exciton wave functions into interfacial electronic states formed from interaction LUMO Cd(O2CPh)2, as opposed originating change size or reorganization inorg...
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