The effect in the assembly and node nuclearity of the long and rigid character of bis-pyridyl exo-bidentate spacers when react with zinc acetate: Crystal structures of the high nuclearity coordination polymers [Zn7(μ4-O)2(OAc)10(3pdb)]n (3pdb = 1,4-bis

Two new coordination polymers [Zn7(μ4-O)2(OAc)10(3pdb)]n (3pdb = 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene) and [Zn7(μ4-O)2(OAc)10(4pdb)]n (4pdb = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene) have been isolated which contain heptanuclear cluster as nodes.