Halometallates Bind as Z-Type Ligands on Wurtzite CdSe Nanoplatelets

Two-phase ligand exchange of amine-ligated, wurtzite, [CdSe(n-octylamine)0.43(oleylamine)0.07] nanoplatelets with ammonium salts (NH4Cl or [NH4]2[ZnCl4]) or the Lewis acids (ZnCl2 or CdCl2) in N-methylformamide/hexane afford NMF-ligated [CdSe(NMF)0.18(n-octylamine)0.09] nanoplatelets. Subsequent ligand exchanges with the intermediate NMF-ligated nanoplatelets give halometallate-ligated CdSe nanoplatelets having CdX3- or ZnX42- ligands (X = Cl, Br, and I). Two-phase ligand exchange of [CdSe(n-octylamine)0.43(oleylamine)0.07] nanoplatelets with ammonium salts [NH4][CdX3] in N,N-dimethylformamide afford halometallate ligation directly. Analysis of the absorption spectra and X-ray diffraction data of the halometallate-ligated nanoplatelets establish that the halometallates bind as intact, Z -type ligands.