Magnetic properties of a noninterpenetrating chiral porous cobalt metal-organic framewok
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Noninterpenetrating chiral porous cobalt metal-organic framework built from the coplanar triangular H3 TATB ligands has been synthesized under solvothermal conditions. X-ray analysis revealed the compound crystallized in the chiral space group either P 41 32 or P 43 32, 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 3.604 Å. Paramagnetic behavior is observed throughout the measured temperature range of 2-300 K. 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× 10-16 erg, θ∼-16 K. © 2007 American Institute of Physics.
author list (cited authors)
Yu, C., Ma, S., Pechan, M. J., & Zhou, H.