Cyclo-[Ni(??2-SPh)2]9 and cyclo-[Ni(??2-SPh)2]11: new oligomeric types of toroidal nickel(ii) thiolates containing geometrically unprecedented 9- and 11-membered ring systemsDedicated to Professor Ed Abel and Dr. Peter Woodward for highly insipiring research during their illustrious academic careers that included the preparation and structural analysis of the first tiara-like member, [Ni(??2-SEt)2]6, of the currently extensive oligomeric cyclo-[Ni(SR)2]n family (n = 4, 5, 6, 8, 9, 11).