July 04, 2020, 06:03:17 AM
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Topic: Lambda/Delta isomers and effect on solubility  (Read 316 times)

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Offline Kyriee

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Lambda/Delta isomers and effect on solubility
« on: December 31, 2019, 09:54:33 AM »
Hi all!
We recently synthesized the Λ and Δ isomers of the tris-ethylendiamine Cobalt iodide ( [Co(en)3]I3 ).
After the synthesis, we separed them with a simple Buchner filtration, and washed the precipitate with an aqueous solution of 40% ethanol. We kept the solid precipitate ( Λ isomer ) and discarded of the solution ( containing the Δ isomer ).
My question is the following: how does the Δ/Λ isomerism influence the solubility of the complex?
Why was the Lambda isomer almost completely insoluble, while the solution was bright orange due to the complete solubilization of Delta isomer?

Thank you all in advance!

Offline Zewski

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Re: Lambda/Delta isomers and effect on solubility
« Reply #1 on: February 01, 2020, 08:23:54 AM »
Both complexes are enantiomers and that means that they have exactly the same physical properties. Unless you used enantiopure solvent you wouldnt be able to separate them through precipitation...

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