A novel linear-shaped octanuclear Ni(II)-based cluster formed by one-pot condensation and coordination self-assembly: crystal structure and highly efficient conversion of CO2 into cyclic carbonates

A novel Ni 8 cluster with the molecular formula [Ni₈(L 2− ) 8 (CH 3 OH) 2 ] ( 1 ) (H 2 L = (E)-2-((5-bromo-2-hydroxybenzylidene)amino)-6-methoxybenzoic acid) has been synthesized by one-pot condensation and coordination self-assembly and structurally characterized. X-ray diffraction analysis reveals that cluster 1 displays a linear-shaped octanuclear structure and each central Ni(II) ions in 1 adopt a distorted octahedron coordination geometry. Catalytic performance studies indicates that cluster 1 can effectively convert CO 2 with epoxides forming cyclic carbonates under mild reaction conditions. What's more, cluster 1 as heterogeneous catalyst can be reused at least five times with a negligible loss of catalytic activity.