anhydrous), 1-chloropentane (99%), cyclohexyl isocyanide
(98%), diphenylphosphine (98%), hexane (mixture of isomers, ≥99%,
anhydrous), isopropanol (99.5%, anhydrous), lead acetate trihydrate
(≥99.99%), methanol (99.8%, anhydrous), 1-octadecene (90%),
octane (≥99%, anhydrous), oleic acid (90%), pyrrolidine (≥99%),
selenium powder (99.99%, −100 mesh), tetrachloroethylene (≥99%,
anhydrous), toluene (99.8%, anhydrous), triethylamine (≥99%),
trifluoroacetic acid (99%), trifluoroacetic anhydride (≥99%),
trimethylbenzene (98%), and trioctylphosphine (90%) were purchased
from Sigma-Aldrich and used without further purification. Lead (II)
oxide (99.999+%) was purchased from Strem Chemicals. 1,4-Butanediol
(BD, 99%, ReagentPlus), diethylene glycol (DEG, 99%), diphenyl ether
(≥99%), ethylene glycol (EG, 99.8%, anhydrous), and hexadecane
(≥99%) were purchased from Sigma-Aldrich and degassed under
vacuum for ∼14 h at 60 °C prior use. For superlattice
formation, a distillation of the EG did not result in a significant
difference in the quality of the formed superlattice (see