I am dealing with anionic matrices and was wondering if anyone could provide suggestions and/or a protocol for such a procedure?
Just some (less qualified) thoughts:
a) Basically Pd and Pt prefer soft (HSAB principle, Pearson) ligands such as thiolates
b) thus, carboxylic acids (hard) might not be very suitable, bisphosphonates coordinate well to Ca (which is also hard).
c) I am not familiar with this chemistry but complexes of the general form [Pd(Saryl)4]2- (with Saryl = arylthiolates) should be stable. Aryl could be anything and could be nicely varied from electron-rich = mesityl to electron poor C6F5. The charge of 2- should make them water-soluble, otherwise the aryl-substituent might to chosen to make these complexes even more water-soluble. The same should be valid for Pt(II) (in this case this should be even more stable).
For Pt(IV) I see problems to generate anionic complexes. Pt(IV) complexes are usually octahedrally configured and it is surely no problem to attach four negative ligands froming thus neutral complexes such as [(bpy)PtMe4] or [(bpy)Pt(Saryl)4].
In principle you can try the same approach and head for complexes of the type [Pt(Saryl)6]2-.
good luck
AXEL
Bisphosphonates coordinate many other metal cations than Ca, we have just discovered novel bisphosphonate based material to collect various metal cations from water solutions, however I do not remember if we have tested this material with noble metal cations, have to check this.
Dear Petri,
I apologize if I was too categoric saying bisphosphonates coordinate only Ca2+. What cations did you use? Can you send me a reference? Is your research related to bone seeking radioisotopes?
best
AXEL
Dear Axel,
Never mind :). Our research has concetrated now for metal collection from water solutions with our material (patent application titled: METHOD FOR COLLECTING METALS has became recently public), but the synthesis of various bisphosphonate derivatives for various purposes is our main knowledge.
Dear Julio,
in the meantime I found that the compound K2[Pt(C6Cl5)6] has been prepared by Peach long ago (Can. J. Chem.. 1970, 48, 1869), more of this chemistry might have been reported since then.
best
AXEL
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