Structure and Magnetic Properties of a New Cobalt(II)\nThiophenedicarboxylate Coordination Polymer Showing Unprecedented\nCoordination
Aude Demessence (2366521)Guillaume Rogez (1655599)Richard Welter (1770946)Pierre Rabu (1661632)
Abstract
A new carboxylato-bridged Co<sup>II</sup> network of formula {Co((κ<sup>1</sup>-κ<sup>1</sup>)-(κ<sup>1</sup>-μ<sub>2</sub>)-μ<sub>4</sub>-TDC)(μ<sub>2</sub>-H<sub>2</sub>O)<sub>0.5</sub>(H<sub>2</sub>O)}<i><sub>n</sub></i> (H<sub>2</sub>TDC = 2,5-thiophenedicarboxylic acid) has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction, thermogravimetric analysis,\nand IR and UV−visible spectroscopies. The title compound is made\nof chains of Co<sup>II</sup> dimers interconnected by TDC<sup>2-</sup> ligands, showing\nan unprecedented asymmetric tetradentate coordination mode of\nthe carboxylate functions. Magnetic measurements show weak\nferromagnetic interactions between the Co ions within the dimers.
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