Role of ligand conformation in the structural diversity of copper(II) and silver(I) coordination polymers containing the angular dipyridyl ligand bearing amide spacer

The new dipyridyl ligands N,N′-(methylenedi-p-phenylene)bis(pyridine-4-carboxamide), L1, and N,N′-(methylenedi-p-phenylene)bis(pyridine-3-carboxamide), L2, have been used to prepare complexes of the types [Cu(L1)2X2]∞ (X = Cl, 1 and X = Br, 2), {[Cu(L1)2(DMF)](NO3)2}∞, 3, {[Ag2(L1)2](SO4)}∞, 4, and {[Cu(L2)(DMSO)2(NO3)](NO3)}∞, 5. Complexes 1-3 form 1-D double-stranded polymeric chains. Complex 4 forms 1-D zigzag polymeric chains, which are interlinked through a series of Ag-O interactions to form wavy 1-D ladder like chains, and complex 5 forms 1-D sinusoidal chains.