Synthesis, characterization, and magnetic studies of coordination polymers with Co(II) and Mn(II) ions

Musheer Ahmad, Raja Das, Prem Lama, Pankaj Poddar, Parimal K. Bharadwaj

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

An ether bridged tricarboxylic acid ligand, 5-(4-carboxybenzyloxy) isophthalic acid (p-cbiaH 3) has been used to construct three coordination polymers with Co(II) salts in presence of different nitrogen donor ligands such as 1,4-bis(4-pyridinylmethyl)piperazine (bpmp), dipyridine-4-yl-diazene (dpd), and 4,4′-bipyridine (bpy). The products formed under hydrothermal conditions are formulated as {[Co 3(p-cbia) 2(bpmp) 2(H 2O) 6]•10H 2O} n (1), {[Co 2(p-cbiaH) 2(dpd) (H 2O) 2]} n (2) and {[Co 3(p-cbia) 2(bpy)(H 2O) 8]•6H 2O} n (3). Reacting with MnCl 2•4H 2O under solvothermal condition, it affords {[Mn 3(p-cbia) 2(DMF) 2]•DMF} n (4). All the complexes have been characterized by single-crystal X-ray diffraction, IR spectroscopy, thermogravimetry, elemental analysis, and powder X-ray diffraction (PXRD) measurements. Topological analysis reveals that 1 is a (3,4)-connected jeb net, 2 is a (3,8)-connected tfz-d net, while 3 forms a 3-connected hcb type net. However, with the Mn(II) salt, it forms a 3D coordination polymer with a novel (5,6,6)-connected, three nodal net with novel pkb-4 topology. Magnetic susceptibility measurements of complexes 1, 2, and 4 were carried out in the temperature range 2-300 K. Complex 1 exhibits weak ferromagnetic ordering at low temperature owing to the frustration of one of the Co(II) ions in the unit cell. Complex 2 shows a peak at ∼6.1 K in ZFC susceptibility, which might result from weak ferromagnetic interactions between carboxylate-bridged Co(II) ions. Complex 4 shows a signature of antiferromagnetic behavior followed by weak ferromagnetic interactions at low temperature.

Original languageEnglish
Pages (from-to)4624-4632
Number of pages9
JournalCrystal Growth and Design
Volume12
Issue number9
DOIs
Publication statusPublished - 05 Sep 2012
Externally publishedYes

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