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. Author manuscript; available in PMC: 2013 Feb 22.
Published in final edited form as: J Am Chem Soc. 2012 Feb 10;134(7):3387–3395. doi: 10.1021/ja208640t

Figure 5.

Figure 5

Dehydration upon titration by Ca2+, but not Mg2+. ATR-FTIR spectra are collected during optical titration with (A) Ca2+ and (B) Mg2+ using pure PIP2 supported monolayers. (C) Cartoon pictures show the putative differences between Ca2+ and Mg2+ when interacting with PIP2 head groups.