Syntheses, Crystal Structures, and Magnetic Properties of Two Mn(II) Coordination Polymers Based on the 5-Aminotetrazole Ligand: Effect of Sources of Ligand on Construction of Topological Networks

Abstract

Two new Mn(II) coordination polymers, [Mn 15 (atz) 18 (μ 3 -OH) 4 (μ 3 -SO 4 ) 4 ] n ·9 n H 2 O ( 1 ) and [Mn 8 (atz) 4 (μ-OH) 4 (μ 4 -SO 4 ) 4 (H 2 O) 4 ] n · n H 2 O ( 2 ) (atz = 5-aminotetrazolate), have been prepared under similar hydrothermal conditions except the difference of the source of the atz ligand. They were characterized by single-crystal X-ray diffraction studies, variable temperature (1.8−300 K) magnetic measurements, and thermal gravity analysis. The results of X-ray crystallographic analysis reveal that compound 1 is a 3D coordination polymer with a (3,4)-connected (8 3 ) 4 (8 6 ) 3 topology, which is built from trinuclear [Mn 3 (μ 3 -SO 4 )(μ 3 -OH)] clusters and bridging mononuclear Mn centers. In compound 2, it contains a 3D inorganic cationic [Mn 8 (μ 3 -OH) 4 (μ 4 -SO 4 ) 4 ] n 4+ network with an unprecedented (4,6)-connected topological net, the Schläfli symbol of which is (3 3 ·8 2 ·9) 2 (3 6 ·8 4 ·9 5 ). The inorganic cationic net is templated by the atz ligands to form a microporous framework with hydrophilic channels. The variable temperature magnetic data indicate that 1 exhibits antiferromagnetic behavior, whereas 2 shows ferrimagnetic behavior.