Four Cobalt(II)‐Containing Coordination Polymers: Effects of pH Value and Temperature on Synthesis, Gas‐Sorption, and Magnetic Properties

Four 3D Co II ‐containing coordination polymers – namely, [Co 2 (L)(OH)(H 2 O)] · 1.5H 2 O ( 1 ), [Co(HL)(H 2 O)] ( 2 ), [Co 4 (HL)(L)(trz) 3 (H 2 O)] · 6H 2 O ( 3 ), and [Co 3 (HL) 2 (trz) 2 (H 2 O) 2 ] ( 4 ) {H 3 L = 5‐(benzonic‐4‐ylmethoxy)isophthalic acid; Htrz = 1,2,4‐triazole} – based on a semirigid carboxylate ligand have been successfully synthesized under hydrothermal conditions. Compounds 1 / 2 and 3 / 4 were obtained by using the pH value and temperature as the only independent variable, respectively. Compound 1 possesses a (4,8)‐connected net based upon tetranuclear Co II clusters, whereas 2 shows a (3,6)‐connected net based on binuclear Co II units. Compound 3 displays a 4‐nodal (3,4,7)‐connected framework with 1D channels, whereas 4 reveals a (3,10)‐connected net based upon trinuclear Co II clusters. The CO 2 ‐selective adsorption property of compound 3 was studied. In addition, the variable‐temperature magnetic susceptibilities of compounds 1 – 4 were also investigated.