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

Abstract

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 two pyridyl–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 4‐pyridinecarboxylate (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 π conjugation of the external linking ligand.