Octacyanotungstate(V)-based magnetic complex consisting of dimeric Mn2 and tetrameric Mn2W2

A novel zero-dimensional (OD) octacyanotungstate(V)-manganese(II) bimetallic assembly, {[Mn-II(bipy)(2)](2)(OX)}center dot {[Mn-II(bipy)(2)W(CN)(8)](2)}center dot 4H(2)O (1) (bipy = 2,2'-bipyridine, OX = C2O42-), was synthesized in methanol solution containing oxalic acid. X-ray analysis shows 1 is crystallized in monoclinic crystal system with C2/c space group and composed of two components of a dimeric Mn-2 Cation and a quadrate tetrameric Mn2W2 anion. The Mn2 and Mn2W2 moieties are connected by their respective pi-pi stacking to yield the alternative 2D layers, and the 2D layers are linked by hydrogen bonding to form a 3D network. The investigation of the magnetostructural correlation reveals that cyanide and oxalate bridges mediate weak intracluster antiferromagnetic coupling between Mn and W ions and between Mn ions, respectively. Further magnetic measurements and analysis show the spin glasses and intercluster ferromagnetic interaction exist in complex 1.