Four Coordination Polymers Containing 2, 6‐Naphthalenedi­carboxylic Acid and 1, 10‐Phenanthroline: Synthesis, Structure, and Magnetic Properties

Abstract

Abstract[Co(phen)(NDA)0.5(H2O)3]·H2O·0.5NDA (a) (NDA = 2, 6‐naphthalenedicarboxylate ions, phen = 1, 10‐phenanthroline), and four novel coordination polymers (CPs), [M(phen)(NDA)]n [M = Co (1), Ni (2), Mn (3), and Cd (4)], were synthesized under hydrothermal conditions. They were structurally characterized by single‐crystal X‐ray diffraction. Compound a was obtained by hydrothermal condition of 80 °C, displaying a zero dimension structure, and three coordinated water molecules located on the central Co2+ ion. By decreasing the number of coordinated water molecules in a under high reaction temperature of 170 °C, the discrete motif of a was transferred into a 2D structure of 1. Employing the same synthesizing condition like that of 1, compounds 2–4 were prepared, of which 2 exhibited a 2D layer and compounds 3 and 4 feature novel 3D architectures. The magnetic susceptibilities of 1–3 were measured and discussed. There exist ferromagnetic coupling between the nearest metal ions in 1 and 2, and the best theoretical fitting parameters were J = 3.96 cm–1, g = 2.42 for 1 and J = 3.44 cm–1, g = 2.02 for 2. The study of the magnetic property of 3 shows the occurrence of weak antiferromagnetic interaction between Mn2+ with fitting parameters of J = –0.80 cm–1 and g = 2.03, appearing short‐range antiferromagnetic ordering around 9 K.