On the option of generating novel type surfaces with multiphilic ligands within the cavity of a giant metal-oxide based wheel type cluster: chemical reactions with well-defined nanoobjects

The reaction of an aqueous solution of sodium molybdate with cysteine hydro chloride acting as educt and reducing agent at rather low pH values(approxi mate to 1.5) results in the formation of Na-3[Mo154O462H14(H2O)(48)(HO2C-(N H3+)HC-CH2-S-S-CH2-CH(NH3+)-COO-)(11)].x H2O 1 (x approximate to 250) conta ining nanosized ring-shaped clusters which capture the oxidation product of cysteine, i.e, the diprotonated cystine ligands (H(2)cystine(+)) at the in ner wall of their cavities; interestingly, the multiphilic ligands containi ng different types of functional groups (two -NH3+, one -CO2-, one -CO2H an d one S-S-) attach to the inner wall of the cluster through one of the two carboxylate groups thereby demonstrating the possibility to generate novel type surfaces within the cavity of a nanostructured ring-shaped cluster.