Controllable assembly over two CoII-based coordination polymers: structures and catalytic properties towards the alkene oxyalkylation reaction

Abstract

Two Co^II-coordination polymers were controllably obtained by the solvothermal reaction of C₃ symmetric 5-bromo-1,3-benzenedicarboxylic acid (Br-1,3-H₂BDC), 4,4′,4′′-(2,4,6-trimethylbenzene-1,3,5-triyl)tripyridine (4-TMTBT) ligand, and Co^II salts. Co-CP-1 displayed a 3D net based on a mononuclear Co^II center linked by Br-1,3-BDC²⁻ and 4-TMTBT mixed ligands. Co-CP-2 featured a 3D network based on a trinuclear Co₃(μ₃-OH)(HCOO)(COO)₄ unit and Br-1,3-BDC²⁻ and 4-TMTBT ligands, which could be regarded as a new (3,7)-connected topology net. Interestingly, the two Co-CPs showed good catalytic activities for the alkene oxyalkylation reaction. In particular, Co-CP-2 exhibited higher catalytic performance and could be recycled at least for four cycles without loss of activity and structural integrity.