Ligand Charge Density: PEG-COOH vs. PEG-OH

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The discussion centers on the exchange of Au-citrate nanoparticles with two types of ligands: PEG-COOH and PEG-OH. The primary focus is on the anionic charge density of the ligands, with a consensus that PEG-COOH, due to its carboxylic acid group, is expected to exhibit a higher anionic charge density than PEG-OH. Additionally, considerations for phase transfer of citrate-capped nanoparticles are highlighted, emphasizing the importance of pH and the molecular weight of PEG in the process.
GGdog0818
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I want to exchange my Au-citrate nanoparticle with two kinds of ligands :PEG-COOH and PEG-OH.
Which one is suppose to have more anionic charge density.
 
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The carboxylic acid is more acidic than the alcohol. I vote COOH more anionic.

How are you doing the phase transfer? i have done some phase transfer on citrate capped nanoparticles.
 
I agree with Hyo X but don't forget to consider pH and PEG's molecular weight!
 

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