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Simultaneous manifestation of metallic conductivity and single-molecule magnetism in a layered molecule-based compound

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Abstract

Single-molecule magnets (SMMs) show superparamagnetic behaviour below blocking temperature at the molecular scale, so they exhibit large magnetic density compared to the conventional magnets. Combining SMMs and molecular conductors in one compound will bring about new physical phenomena, however, the synergetic effects between them still remain unexplored. Here we present a layered molecule-based compound, β′′-(BEDO-TTF)4 [Co(pdms)2]·3H2O (BO4), (BEDO-TTF (BO) and H2pdms are bis(ethylenedioxy)tetrathiafulvalene and 1,2-bis(methanesulfonamido)benzene, respectively), which was synthesized by using an electrochemical approach and studied by using crystal X-ray diffraction. This compound simultaneously exhibited metallic conductivity and SMM behaviour up to 11 K for the first time. The highest electrical conductivity was 400–650 S cm−1 at 6.5 K, which is the highest among those reported so far for conducting SMM materials. Furthermore, antiferromagnetic ordering occurred below 6.5 K, along with a decrease in conductivity, and the angle-independent negative magnetoresistance suggested an effective electron correlation between the conducting BO and Co(pdms)2 SMM layers (d–π interactions). The strong magnetic anisotropy and two-dimensional conducting plane play key roles in the low-temperature antiferromagnetic semiconducting state. BO4 is the first compound exhibiting antiferromagnetic ordering among SMMs mediated by π-electrons, demonstrating the synergetic effects between SMMs and molecular conductors.

Graphical abstract: Simultaneous manifestation of metallic conductivity and single-molecule magnetism in a layered molecule-based compound

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Article information


Submitted
24 Jul 2020
Accepted
25 Aug 2020
First published
01 Sep 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020, Advance Article
Article type
Edge Article

Simultaneous manifestation of metallic conductivity and single-molecule magnetism in a layered molecule-based compound

Y. Shen, H. Ito, H. Zhang, H. Yamochi, S. Katagiri, S. K. Yoshina, A. Otsuka, M. Ishikawa, G. Cosquer, K. Uchida, C. Herrmann, T. Yoshida, B. K. Breedlove and M. Yamashita, Chem. Sci., 2020, Advance Article , DOI: 10.1039/D0SC04040A

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