Construction of Metal-Organic Frameworks: Versatile Behaviour of a Ligand Containing Mono- and Bidentate Coordination Sites

Five new coordination polymers based on a new 2,2'-bipyridine derived ligand N,N'-bis(pyridin-4-yl)-2,2'-bipyridine-5,5'-dicarboxamide (=L) are reported herein. Isostructural three-dimensional coordination polymers with a rare (4,6)-connected network of {44.62}3{46.89}2 topology were synthesised from Cu(NO3)2, Zn(NO3)2 or a mixture of Cu(NO3)2/Fe(BF4)2 with L in complexes {[Cu5L6]center dot(NO3)10 center dot(H2O)18}8 (1), {[Zn5L6]center dot(NO3)10 center dot(H2O)18}8 (2) and {[FexCuyL6]center dot(NO3)10 center dot(H2O)18}8 (3; where x+y=5). Complexes with two-dimensional grid structures resulted from treatment with CoCl2 or Cd(NO3)2 with L in complexes {[CoLCl2]center dot DMF}8 (4) and {CdL(NO3)2}8 (5).