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DOI: 10.1039/A704813K (Paper) Reference Section for: J. Mater. Chem., 1998, 8, 141-146

Charge-transfer salts of M(mnt)2 (M=Ni, Pd, Pt, Au) with BDNT: ferromagnetic interactions in conductive (BDNT)2–[Ni(mnt)2]

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M. Uruichi, K. Yakushi, Y. Yamashita and J. Qin

Abstract

Charge-transfer salts between BDNT and M(mnt)2 (M=Ni, Pd, Pt, and Au) have been prepared by mixing BDNT–(SbCl6)2 and (TBA)2 –[M(mnt)2 ] and by electrochemical oxidation of BDNT in TBA–[M(mnt)2 ] solution. Almost all powdery samples of (1:1) salts show high electrical conductivity. The valence of M(mnt)2 was determined to be –1 by the CN stretching mode, which means that the valence of BDNT is +0.5, +1, or +2. Their crystal structures are not known except for the low-conductive BDNT–[Au(mnt)2 ]2 , in which Au(mnt)2 forms dimers which are arranged in crisscross stacks. Among these compounds, (BDNT)2–[Ni(mnt)2 ] exhibits a ferromagnetic interaction with |J|=3.4 K. It is concluded from the EPR experiment that [Ni(mnt)2 ]– is responsible for the ferromagnetic interaction.

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