A twelve-connected 3D mixed valence Ni(II)/Ni(III) metal-organic framework based on hexnuclear nickel clusters building unit: Synthesis, structure and magnetic properties

Abstract

We have successfully synthesized and characterised a metal-organic framework Ni 6 (μ 3 -OH) 2 (H 2 BTB)(HBTB) 3 (BTB) 2 (H 2 O) 5 ]·13H 2 O ( 1 ), which is a twelve-connected 3D framework with (3 2 .4) 2 (3 8 .4 22 .5 24. 6 10 .7 2 ) topology. The magnetic behavior of 1 shows that an antiferromagnetic coupling among the Ni ions is observed. • A twelve-connected 3D metal-organic framework was successfully synthesized and charactered. • The newly synthesized MOF is based on a rare mixed-equilibrium Ni6 metal cluster and a tripod ligands. • There exists predominantly antiferromagnetic interaction between the Ni centers. A novel (3,12)-connected framework [Ni 6 (μ 3 -OH) 2 (H 2 BTB)(HBTB) 3 (BTB) 2 (H 2 O) 5 ]·13H 2 O with (3 2 .4) 2 (3 8 .4 22 .5 24 .6 10 .7 2 ) topology has been prepared by self-assembly of benzene-1,3,5-tribenzoates and two hexanuclear nickel carboxylate clusters under hydrothermal conditions. The magnetic property of this compound was investigated in the temperature range of 2.0–300.0 K under an outer field of 2000 Oe. The result shows the dominant antiferromagnetic interaction between Ni centers.