A Mixed-Valence Coordination Polymer Featuring Two-Dimensional\nFerroelectric Order: {[Cu<sup>I</sup><sub>4</sub>Cu<sup>II</sup>(Et<sub>2</sub>dtc)<sub>2</sub>Cl<sub>3</sub>][Cu<sup>II</sup>(Et<sub>2</sub>dtc)<sub>2</sub>]<sub>2</sub>(FeCl<sub>4</sub>)}<i><sub>n</sub></i> (Et<sub>2</sub>dtc<sup>-</sup> =\ndiethyldithiocarbamate)
Takashi Okubo (478622)Ryo Kawajiri (2659291)Tadaoki Mitani (2199898)Tatsuya Shimoda (1329342)
Abstract
The first mixed-valence coordination polymer indicating ferroelectric properties, {[Cu<sup>I</sup><sub>4</sub>Cu<sup>II</sup>(Et<sub>2</sub>dtc)<sub>2</sub>Cl<sub>3</sub>][Cu<sup>II</sup>(Et<sub>2</sub>dtc)<sub>2</sub>]<sub>2</sub>(FeCl<sub>4</sub>)}<i><sub>n</sub></i> (Et<sub>2</sub>dtc<sup>-</sup> = diethyldithiocarbamate), has been synthesized and crystallographically characterized. This complex has a two-dimensional infinite square lattice structure, including both Cu(I) and Cu(II) ions, which is confirmed by XPS and SQUID measurements. In addition, the ferroelectric behaviors are revealed by the dielectric measurements with a LCR meter and a ferroelectric tester.
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