“…We initiated a study of the reactivity of the reduced dinuclear {Mo V 2 O 4 } 2+ group with bisphosphonates, starting with the simplest species, methylenediphosphonate (R 1 =H, R 2 =H), and reported a large family of ring‐shaped reduced POMs built up by alternating organic ligands and dimers of edge‐sharing Mo V octahedra with the general formula {(Mo V 2 O 4 )(O 3 PCH 2 PO 3 )} n ( n =3, 4, 6, 10) 14. Some of these compounds encapsulated extra ligands, such as carbonate,14a sulfite,14b or methylarsenate 14c. These anions have been successfully used as both reductants and as stabilizing agents for the synthesis of metallic nanoparticles (Pd 0 , Pt 0 , Ag 0 ),14c, 15 and we recently extended this family of compounds by using the commercial drug etidronate (R 1 =OH, R 2 =CH 3 ) 16…”