Solvent-controlled metal coordination polymers of Co(II) with different topological structures and properties

Three new Co(ii) coordination polymers {[Co(TTPA)center dot(H2O)(2)]center dot H2O}(n) (Co-1), {[Co-3(TTPA)(3)(H2O)(2)]center dot 4DMSO}(n) (Co-2), and Co(TTPA)center dot(H(2)TTPA)]center dot 2DMSO}(n) (Co-3) were successfully synthesized based on a multidentate bridging organic ligand 2,5-bis-(1,2,4-triazol-1-yl)-terephthalic acid (H(2)TTPA) under solvent-controlled thermal reaction conditions. Single-crystal X-ray diffraction studies show that complex Co-1 has a 4,4-linked two-dimensional layered structure, which is formed in a H2O-DMF-methanol mixed solvent. Co-2 displays a novel complicated topology-a 4,4,5,6-c tetranodal 3D framework with 1D channels along the a direction and is obtained under the condition of an equal volume ratio of DMSO and methanol as a solvent. Co-3 presents another 3D porous framework with a 4,6-dinodal 3D framework with a pore volume of 36.3% and is synthesized under the volume ratio of DMSO to methanol of 3 : 1. In addition, the static and/or dynamic magnetic properties of the three polymers were determined. The microporous MOF Co-2 also underwent gas sorption measurements.

Automated summary

Three new Co(ii) coordination polymers were successfully synthesized under solvent-controlled thermal reaction conditions, displaying different structural topologies and porous frameworks, obtained under different DMSO to methanol volume ratio conditions.