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What is OCTADECENE?Uses,Purification method

Sep 7，2020

Octadecene is a long-chain hydrocarbon and an alkene with the molecular formula C18H36. There are multiple structural isomers of octadecene, depending on the position of the double bond. 1-Octadecene, an alpha-olefin, is a relatively inexpensive solvent, with a boiling point of 315 °C.It is compatible with oleic acid.

Octadecene is used in the synthesis of colloidal quantum dots, but it can possibly be replaced by heat transfer fluids such as Dowtherm A or Therminol 66 in this process.

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Uses

1-octadecene is a widely used solvent for high temperature nanocrystal synthesis (120–320 °C).
Non-coordinating 1-octadecene (ODE)is another frequently used solvent and seems to be plagued less by impurities.Apart from its role as solvent, ODE has often been used as reagent in NC synthesis since ODE’sterminalalkene (vinyl) has inherent reactivity. For example, itsredox properties havebeen harnessed to reduce elemental sulfur or selenium to its –II oxidation state, prior to incorporation in metal sulphide or selenide NCs.

Purification method

Typical purification procedures (precipitation/redispersion cycles or size exclusion chromatography)fail to separate the poly(1-octadecene) impurity from the nanocrystal product. To avoid formation of poly(1-octadecene), we replaced 1-octadecene with saturated, aliphatic solvents. Alternatively,the native ligandsare exchanged for polar ligands, leading to significant solubility differences between nanocrystals and poly(1-octadecene), thereforeallowing isolation ofpure nanocrystals, free from polymer impurities. These results will help design superior syntheses and improve nanocrystal purity, an important factor in manyapplications.

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