Reversible Z‑Type to L‑Type Ligand Exchangeon Zinc-Blende Cadmium Selenide Nanoplatelets
2020
Three-monolayer
CdSe nanoplatelets having the composition (CdSe)3[Cd(OAc)0.77(oleate)1.23]0.78, large lateral
dimensions, minimal strain distortions, and the zinc-blende
crystal structure undergo Z-type to L-type ligand exchange with ethylenediamine,
affording NPLs of composition (CdSe)3[en]0.67 (en = ethylenediamine). The L-type ligation of the (CdSe)3[en]0.67 (en = ethylenediamine) NPLs is exchanged for
Z-type ligation with Cd(oleate)2, Cd(OAc)2,
CdCl2, Zn(oleate)2, and ZnCl2, giving
NPLs having near to the ideal compositions of (CdSe)3[MX2]. All of the Z-type to L-type and L-type to Z-type ligand
exchanges are kinetically slow, requiring several hours to reach completion,
suggesting that a considerable surface reconstruction is required.
In contrast, three-monolayer NPLs having a significant rolling distortion
and four- and five-monolayer NPLs having small lateral dimensions
are unstable to ethylenediamine, and Z-type to L-type ligand exchange
is not achieved.
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