Abstract
Noninterpenetrating chiral porous cobalt metal-organic framework built from the coplanar triangular H3TATB ligands has been synthesized under solvothermal conditions. X-ray analysis revealed the compound crystallized in the chiral space group either P4132 or P4332, and adopted a trimetallic “hourglass” secondary building unit, in which there are two terminal Td-Co atoms and one central Oh-Co with Td-Co and Oh-Co distance about 3.604Å. Paramagnetic behavior is observed throughout the measured temperature range of 2–300K. Assuming a uniform isotropic interaction between the nearest neighbor Co atoms, susceptibility of the trinuclear Co2+ linear chain has been calculated by following Van Vleck’s quantum model for spin-spin couplings. The resultant fit to the data indicates an antiferromagnetic Co–Co interaction in the molecule, with coupling strength J∼−6.2×10−16erg, θ∼−16K.
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