Extended Data Fig. 1: Nuclear magnetic resonance (NMR) characterization of the Cu26Se13(PEt2Ph)14 cluster.
From: Precision synthesis of a CdSe semiconductor nanocluster via cation exchange
a, 31P{H} NMR of free PEt2Ph ligand at room temperature (top) and Cu26Se13(PEt2Ph)14 cluster at variable temperatures (bottom). Seven peaks can be resolved at low-temperature spectra for the cluster, matching with seven chemically inequivalent phosphorous (P1 to P7) in the crystal structure (left). b, Corresponding 1H NMR spectra. c, 1H−1H correlated spectroscopy (COSY) spectrum of the cluster measured at −40 °C (left) and corresponding 1D spectrum (right). Seven groups of correlated protons in the phenyl group of the PEt2Ph ligands can be identified. The sample is measured in toluene-d8. Solvent peaks at 7.09, 6.97-7.01, and 2.08 ppm are labelled by *.
