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Synthesis, structures and magnetic properties of four 3D heterometallic cobalt(II)–barium(II) coordination polymers

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Four heterometallic complexes, namely {[CoBa(2,5-pdc)2(H2O)3]n·2nH2O} (1), [CoBa(2,5-pdc)2(H2O)4]n (2), [CoBa(2,5-pdc)2(H2O)5]n (3) and [CoBa2(2,5-pdc)32-H2O)2(H2O)4]n (4) (2,5-H2pdc = pyridine-2,5-dicarboxylic acid), have been hydrothermally synthesized and characterized both structurally and magnetically. All four complexes exhibit 3D frameworks, in which the Co(II) centers are chelated by pyridine nitrogen and carboxyl oxygen atoms in a five-membered ring. The Ba(II) centers are chelated and bridged by carboxyl oxygen atoms to extend the structures into 3D frameworks. The networks of the complexes can be controlled via rationally choosing the appropriate ligand and tuning the ratio of the two types of metal centers. The magnetic properties of complexes 1, 2 and 4 have been investigated from 2 to 300 K.

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The authors acknowledge the financial support from Opening Foundation of the Chinese National Engineering Research Center for Control and Treatment of Heavy metal Pollution, Changsha, 410083, China (No. 2015CNERC-CTHMP-12), the Major Science and Technology Planning Project of Hunan Province, China (2013FJ1009) and the Natural Science Foundation of China (Nos. 51604307 and 21271189).

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Correspondence to Hui Liu.

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Sun, Q., Lu, J., Chai, L. et al. Synthesis, structures and magnetic properties of four 3D heterometallic cobalt(II)–barium(II) coordination polymers. Transit Met Chem 43, 439–450 (2018).

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