title: Tuning the structure and magnetism of heterometallic sodium(1+)-cobalt(2+) formate coordination polymers by varying the metal ratio and solvents.
abstract: Three new heterometallic formate coordination polymers formulated as [Na2Co(HCOO)4]∞ (1), [NaCo(HCOO)3]∞ (2), and [Na2Co7(HCOO)16]∞ (3) were obtained by adjusting the solvent and ratio of the reactants. In 1, a (4,4) cobalt formate layer is formed and the sodium ions connect the layers to form a three-dimensional (3D) framework. In 2, each formate ligand binds two Co(2+) and two Na(+) ions with a syn,syn,anti,anti coordination mode to form a chrial network with 4,6-connected topology. 3 is a Na(+)-ion-linked 3D framework based on the cobalt formate layer, which has a 10-membered metal ring. Magnetic studies indicate the existence of ferromagnetic interactions between adjacent Co(2+) ions in 1, while dominating antiferromagnetic couplings in 2 and 3.
authors: Department of Chemistry and TKL of Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, China.
authors: Jiong-Peng
authors: JP
authors: Zhao
authors: Song-De
authors: SD
authors: Han
authors: Ran
authors: R
authors: Zhao
authors: Qian
authors: Q
authors: Yang
authors: Ze
authors: Z
authors: Chang
authors: Xian-He
authors: XH
authors: Bu