Synthesis and Structures of 1D and 2D-Zn Gd Coordination Polymers: [ZnGd(L)(NO3)2(4-ppa)(EtOH)] and [ZnGd(L)(NO3)2 (4-pca)] (H2L=1,3-bis((3-methoxysalicylidene) amino) propane); 4-Hppa=4-pyridinepropionic acid; 4-Hpca=4-pyridinecarboxylic acid

This paper reports the synthesis, crystal structures, and thermal behavior of two zinc-gadolinium (3d-4f) coordination polymers by adjusting the connectivity of a secondary building unit (SBU) with twopyridyl-carboxylic acids as linkers. As a SBU, the Zn-Gd compartment compound, [ZnGd(L)(NO3) (CH3CN)(H2O) (4)](NO3) (2)(H2O) (H2L = 1,3-bis((3-methoxysalicylidene) amino) propane), was used. Under microwave heating conditions, the SBU reacted with 4-pyridinepropionic acid (4-Hppa) and 4pyridinecarboxylate (4-Hpca) to create a 1D polymer, [ZnGd(L)(NO3) (2)(4-ppa)(EtOH)], and a 2D polymer, [ZnGd(L)(NO3) (2)(4-pca)], respectively. Dimensionality of the products appeared to depend on the continuity of pi conjugation of the external linking ligand.