Probing the Surface Structure of Amine/Chloride-Passivated CdSe Nanocrystals Using Dynamic Nuclear
Anuluxan Santhiran1,2, Faith Quinn1, Eunbyeol Gi1,2
1Division of Materials Science and Engineering, Ames National Laboratory, Ames, Iowa 50011, United States.
Abstract:
Ligands have been extensively used to modulate and improve the photophysical properties of nanocrystals (NCs). However, the surface structure of many NCs remains unknown. In this study, we synthesized oleate-capped CdSe NCs, exchanged them with oleylamine/CdCl2, and used dynamic nuclear polarization (DNP)-enhanced solid-state NMR spectroscopy to determine the structure of surface Cd atoms bound to ligands. 113Cd and 77Se NMR experiments distinguish different types of 113Cd and 77Se environments in the CdSe NCs. DNP-enhanced 113Cd magic angle turning (MAT) experiments enable the identification of one bulk and two surface Cd environments in CdSe NCs, while DNP-enhanced 15N{1H} and 15N{113Cd} heteronuclear correlation experiments reveal nitrogen coordinated Cd atoms on the surface of the CdSe NCs. Indirect detection of chloride ligands was achieved using DNP-enhanced 113Cd{35Cl} J-resolved experiments, revealing that the chlorides bridge between surface Cd atoms. Comparing the experimental NMR spectra to relativistic density functional theory calculation models establishes two distinct surface Cd environments that differ by their ligand environments: one site is coordinated by one amine and a bridging chloride, while the other is coordinated by two amines.
More Related Videos
09:37Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
Published on: February 12, 2019
09:37Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
Related Concept Videos
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
NMR Spectroscopy Of Amines
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR
