Molecular architecture with 2,2 '-bipyrazine and metal ions: Infinite loopand molecular square

The potential of [L2Pd(2,2'-bpz-N-1,N-1')](2+) [L-2 = en (1), L = H2O (4a), 2,2'-bpz = 2,2'-bipyrazine] for use as an angular element in the generatio n of self-organized systems of variable molecular architecture has been stu died. Ag+ forms an infinite loop 3 with 1, in which the metal ions function as cross-linking agents between the organic entities 2,2'-bpz. Complex 4a, on the other hand, self-assembles as a bis(mu-OH) dinuclear species 4b, an d in the presence of 4,4'-bipyridine (4,4'-bpy) as a molecular square 6 wit h the heteroaromatic 4,4'-bpy ligands representing the cross-linking entiti es.