Why in some cases only one functional group out of all present in a compound interacts with nanoparticles?

24 August 2023 1 4K Report

I'm unable to understand the interaction mechanism. In the attached picture, why the interaction didn't occur with S and N in the ring. Same in case of amino acid, interaction occurs with carboxylic functional group not with amine? Please help me to understand this

Nick Gee

It does not make sense as drawn, as we have single bonded oxygen (O minus) apparently forming a loose bond with a nitrogen lone pair of electrons (not explicitly shown). It is difficult to know what was intended. Dotted lines usually mean hydrogen bonds, and I think the author possibly intended to show O-H on the surface of the particle rather than O-.

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