Fig. 4.

X-ray crystal structure of the (Cd₃₂Se₁₄)X₃₆L₄ cluster, where X is ⁻SC₆H₆ (benzenethiolate) and L is N(CH₃)₂CHO (dimethylformamide). (a) The QD is aligned close to the {110}_ZB plane orientation. Atom colors represent Cd (green), sulfide S (yellow), thiolate ligand S (red), and amine ligand N (blue). Phenyl groups are omitted for clarity. Each of the four Cd at the tetrahedral vertices can be interpreted as a single {111}_ZB plane atom bound to a single L-type ligand. (b) Orientation of the ligands, with phenyl groups depicted as red hexagons. The orientation is shown looking at the {100}_ZB direction. Each of the core atomic clusters is shown in reduced form as a green tetrahedron centered on each Cd and surrounded by coordinating S (yellow) and N (blue) atoms. The cluster comprises 6 faces, each with 6 thiolate ligands bound. A single unpassivated S core atom is in the center, which can be interpreted as an unpassivated anionic {111}_ZB facet. Adapted with permission from reference [73].