Talk:Molecular Playground/Poly(ethylene glycol)

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Hydrogens and molecular mass

Hi Erika

Nice article!

I'd like to propose a couple of suggestions for this scene:

1. Adding hydrogens to both models would help visitors that are not expert in using molecular coordinate files from PDB. That may be done in Jmol with "calculate hydrogens". This can probably be added into the scene scripts.

2. Your polymer seems to be composed of 6 units. That does not match the MW declared in the figure legend. Ethylene glycol by itself is indeed C₂H₆O₂. But the polymer is actually (C₂H₄O)_n, plus terminal groups. The hexamer that is displayed is HO-(C₂H₄O)₆-H, hence C₁₂H₂₆O₇ with a molecular mass of ca. 282. Not the 400 claimed.

Angel Herraez 21:38, 30 November 2012 (IST)