I'm a condensed matter student with limited knowledge of chemistry or bond notation. In the attached paper, I'm trying to understand what is meant by(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \equiv\text{Ti}-\text{OH}[/tex]

and

[tex] \equiv\text{Ti}-\text{F}[/tex]

All I've been able to gather is that these represent "surface groups", although I'm not sure what is meant by "groups" in this context. I'm pretty new to bond notation, but I'm reasonably sure that the three horizontal lines represent a triple bond, but I'm not sure how I should interpret this in the context of surface species.

Finally, I know what a ligand is in the context of crystal field theory/coordination complexes, but I don't know what is meant by a "simple ligand exchange" that allows us to go from the first equation to the second. What does this mean and how exactly does this occur?

Any explanation/interpretation would be appreciated. No explanation is oversimplified, because this is all Greek to me at this point.

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# Surface Fluorination/Hydroxyl Group

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