Three Novel 1‐H‐Benzimidazole‐5‐Carboxylate‐Based Nickel(II)/Cobalt(II) Coordination Polymers: Synthesis, Crystal Structures, Luminescent, and Magnetic Properties

Abstract

Abstract Three 1H‐benzimidazole‐5‐carboxylate (Hbic – )‐based coordination polymers, {[Ni(H 2 O)(Hbic) 2 ] · 2H 2 O} n ( 1 ), {[Ni(H 2 O) 2 (Hbic) 2 ] · 3H 2 O} n ( 2 ), and {[Co 2 (H 2 O) 4 (Hbic) 4 ] · 4DMF · 3H 2 O} n ( 3 ) were obtained by reactions of the ligand H 2 bic and Ni II or Co II salts in the presence of different structure directing molecules. They were structurally characterized by single‐crystal X‐ray diffraction, IR spectra, elemental analysis, thermal stability, luminescent, and magnetic measurements. Structural analysis suggests that the three polymers exhibit a 2D (4, 4) layer for 1 and 1D linear double chains for both 2 and 3 due to the variable binding modes and the specific spatial orientation of the Hbic – ligand towards the different paramagnetic metal ions, which were further aggregated into different 3D supramolecular architectures by popular hydrogen‐bonding interactions. Weak and comparable antiferromagnetic couplings mediating by Hbic – bridge are observed between the neighboring spin carriers for 2 and 3 , respectively. Additionally, complexes 1 – 3 also display different luminescence emissions at room temperature due to the ligand‐to‐metal charge transfer.