title: Ag2S2O8meets AgSO4: the second example of metal-ligand redox isomerism among inorganic systems.
abstract: Valence (redox) isomerism based on electron exchange between a metal and a ligand is immensely rare in purely inorganic systems, with only one documented case, that of PbS2which adopts two polymorphic forms corresponding to Pb(iv)(S2-)2and Pb(ii)(S22-). Here we have taken advantage of metathetic reactions using salts of weakly coordinating anions and we have prepared for the first time Ag(i)2S2O8, silver(i) peroxydisulphate. The title compound crystallizes in the non-centrosymmetric Cc space group with partial disorder of the anionic sublattice. Ag(i)2S2O8is a highly thermally unstable diamagnetic and colourless valence isomer of the antiferromagnetic and black Ag(ii)SO4, described by us in the past.
authors: Faculty of Chemistry, University of Warsaw, Pasteur 1, 02093 Warsaw, Poland. w.grochala@cent.uw.edu.pl and Centre of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02089 Warsaw, Poland.
authors: Tomasz E
authors: TE
authors: Gilewski
authors: Centre of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02089 Warsaw, Poland.
authors: Piotr J
authors: PJ
authors: Leszczyński
authors: Centre of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02089 Warsaw, Poland.
authors: Armand
authors: A
authors: Budzianowski
authors: Department of Inorganic Chemistry and Technology, Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia.
authors: Zoran
authors: Z
authors: Mazej
authors: Faculty of Chemistry, University of Warsaw, Pasteur 1, 02093 Warsaw, Poland. w.grochala@cent.uw.edu.pl and Centre of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02089 Warsaw, Poland.
authors: Adam
authors: A
authors: Grzelak
authors: Centre of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02089 Warsaw, Poland.
authors: Tomasz
authors: T
authors: Jaroń
authors: Faculty of Chemistry, University of Warsaw, Pasteur 1, 02093 Warsaw, Poland. w.grochala@cent.uw.edu.pl.
authors: Wojciech
authors: W
authors: Grochala