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

• Published in: CrystEngComm Vol. 23; no. 41; pp. 7253 - 7261
• Main Authors: Ma, Zhi Long, Wang, Meng Chen, Tian, Li, Liu, Zhong Yi
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 25.10.2021
• Subjects: Coordination polymers; Crystals; Magnetic properties; Methanol; Polymers; Single crystals; Solvents; Synthesis; Terephthalic acid; Topology
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/d1ce01093j

Three new Co( ii ) coordination polymers {[Co(TTPA)·(H 2 O) 2 ]·H 2 O} n ( Co- 1 ), {[Co 3 (TTPA) 3 (H 2 O) 2 ]·4DMSO} n ( Co- 2 ), and {[Co(TTPA)·(H 2 TTPA)]·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 H 2 O-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. Three multidimensional Co-polymers were obtained. Co- 1 exhibits as a 2D layer. Co- 2 displays as a tetranodal (4,4,5,6)-connected 3D MOFs. Co- 3 is a binodal (4,6)-connected 3D framework.