Syntheses, crystal structures, and magnetic properties of metal-organic hybrid materials of Co(II) using flexible and rigid nitrogen-based ditopic ligands as spacers

Musheer Ahmad, Manish K. Sharma, Raja Das, Pankaj Poddar, Parimal K. Bharadwaj

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)

Abstract

A carboxylate-based flexible ligand, 5-(4-carboxybenzyloxy)isophthalic acid (p-cbiaH 3), readily reacts with Co(II) salts in the presence of different pyridine-based coligands such as 4-bis(4-pyridinylmethyl)piperazine (bpmp) or 1,2-di(4-pyridyl)ethylene (dpe) under hydrothermal conditions to afford two different three-dimensional (3D) coordination polymers, {[Co 4(OH) 2(p-cbia) 2(bpmp)-(H 2O) 3]•2H 2O} n (1) and {[Co 4(OH) 2(p-cbia) 2(dpe)(H 2O) 4]•2H 2O} n (2). Both compounds have been characterized by X-ray crystallography, IR spectroscopy, thermogravimetry, and elemental analysis. Single-crystal X-ray diffraction studies reveal that both compounds consist of a tetranuclear core [Co 43-OH) 2] 6+. Compound 1 is a unprecedented 3D non-interpenetrated (3,4,9)-connected pkb3 net. On the other hand, compound 2 is a 2-fold interpenetrated (3,8)-connected tfz-d net. Variable temperature static and dynamic magnetic measurements show that both compounds exhibit ferromagnetic behavior associated with mixed hydroxyl/carboxylate-bridged tetranuclear Co(II) clusters as subunits.

Original languageEnglish
Pages (from-to)1571-1578
Number of pages8
JournalCrystal Growth and Design
Volume12
Issue number3
DOIs
Publication statusPublished - 07 Mar 2012
Externally publishedYes

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