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

Two CoII-coordination polymers were controllably obtained by the solvothermal reaction of C-3 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 CoII salts. Co-CP-1 displayed a 3D net based on a mononuclear CoII center linked by Br-1,3-BDC2- and 4-TMTBT mixed ligands. Co-CP-2 featured a 3D network based on a trinuclear Co-3(mu(3)-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.