Synthesis, Structure,
and Magnetic Properties of a
New Eight-Connected Metal–Organic Framework (MOF) based on
Co<sub>4</sub> Clusters
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Abstract
A hydrothermal reaction of cobalt nitrate, 4,4′-oxybis(benzoic
acid) (OBA), 1,2,4-triazole, and NaOH gave rise to a deep purple colored
compound [Co<sub>4</sub>(triazolate)<sub>2</sub>(OBA)<sub>3</sub>], <b>I</b>, possessing Co<sub>4</sub> clusters. The Co<sub>4</sub> clusters
are connected together through the tirazolate moieties forming a two-dimensional
layer that closely resembles the TiS<sub>2</sub> layer. The layers
are pillared by the OBA units forming the three-dimensional structure.
To the best of our knowledge, this is the first observation of a pillared
TiS<sub>2</sub> layer in a metal–organic framework compound.
Magnetic studies in the temperature range 1.8–300 K indicate
strong antiferromagetic interactions for Co<sub>4</sub> clusters.
The structure as well as the magnetic behavior of the present compound
has been compared with the previously reported related compound [Co<sub>2</sub>(μ<sub>3</sub>-OH)(μ<sub>2</sub>-H<sub>2</sub>O)(pyrazine)(OBA)(OBAH)] prepared using pyrazine as the linker between
the Co<sub>4</sub> clusters