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I'm looking for a tame biochemist who I can bother with silly molecular physics questions about chlorophyll and excited states and charge separation and things.

Can anyone help me out?

I'm just going to ramble, in case anyone is listening and has insights.

So I've been trying to find out what role the Mg plays in chlorophyll and I've found nothing but a whole bunch of non-answers and vague handwaving.

Synthetic photosensitisers have excitation mechanisms involving the metal centre. In Ruthenium tris-bipyridine, for instance, an electron on the Ru2+ atom is excited, and the charge is transferred to a ligand (MLCT) by intersystem crossing. Which means charge separation, etc, etc.

But Mg2+ has the same electron configuration as Ne, and effectively has no valence electrons. So what's the excitation mechanism when the metal centre is Mg? LMCT?

Re: chlorophyll 

Re: chlorophyll 

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