Synthesis, structure, and magnetic properties of cobalt(II) coordination polymers from a new tripodal carboxylate ligand: weak ferromagnetism and metamagnetism

Lama, Prem ; Aijaz, Arshad ; Carolina Saudo, E. ; Bharadwaj, Parimal K. (2010) Synthesis, structure, and magnetic properties of cobalt(II) coordination polymers from a new tripodal carboxylate ligand: weak ferromagnetism and metamagnetism Crystal Growth & Design, 10 (1). pp. 283-290. ISSN 1528-7483

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Official URL: http://pubs.acs.org/doi/abs/10.1021/cg900896w

Related URL: http://dx.doi.org/10.1021/cg900896w

Abstract

A new tripodal carboxylic ligand, 5-(4-carboxy-phenoxy)-isophthalic acid, readily (cpiaH3) reacts with Co(II) salts in the presence of pyridine-based coligands under solvothermal conditions to afford four different coordination polymers, {Co2(cpia)(OH)(bipy)0.5}n (1), {[Co2(cpia)(OH)(H2O)2]·H2O}n (2), {Co1.5(cpia)(bipyethane)}n (3), and {Co1.5(cpia)(pyridine)2}n (4). All these coordination polymers have been characterized by single crystal X-ray diffraction, IR spectroscopy, thermogravimetry and elemental analysis. The structures of 1 and 2 can be described as a repetition of a tetranuclear core with subtle differences - two tetranuclear cores are shared by an O atom in 2, while no such bridging is present in 1. The structures of 3 and 4, on the other hand, consist of a trinuclear core extending to three-dimensional networks. Variable temperature magnetic susceptibility measurements indicate that 1 exhibits ferromagnetic behavior below 13 K, while 2 shows metamagnetic behavior. These interesting magnetic features are associated with the mixed hydroxyl/carboxylate-bridged polynuclear Co(II) clusters as subunits.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:4719
Deposited On:18 Oct 2010 06:58
Last Modified:18 May 2011 07:08

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