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Cation exchange reactions modify the composition of a nanocrystal while retaining other features, including the crystal structure and morphology. In many cases, the anion sublattice is considered to be locked in place as cations rapidly shuttle in and out. Here we provide evidence that the anion sublattice can shift significantly during nanocrystal cation exchange reactions. When the Cu+ cations of roxbyite Cu1.8S nanorods exchange with Zn2+ to form ZnS nanorods, a high density of stacking faults emerges. During cation exchange, the stack
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