Crystal structure, photomagnetic and dielectric properties of a cyanido-bridged Cu-Mo assembly film

Ikeda, Yusuke*; Matsumura, Daiju ; Tsuji, Takuya ; Namai, Asuka*; Imoto, Kenta*; Tokoro, Hiroko*; Nakabayashi, Koji*; Okoshi, Shinichi*

A film of a cyanido-bridged Cu-Mo assembly Cu $_{2}$ [Mo(CN) $_{8}$ ]8H $_{2}$ O (CuMo-film) was electrochemically synthesized. Unlike analogs with a formula of M $_{2}$ [Mo(CN) $_{8}$ ]zH $_{2}$ O (M = Mn, Fe, Co), which show tetragonal crystal structures, the CuMo-film shows a monoclinic structure in the C2/m space group with cell parameters of a = 17.2461 = 125.1089 $^{circ}$ , and V = 1774.44 $AA$^{3}$$ . Extended X-ray absorption fine structure analysis traced the bond distances around the Cu site as 1.93-2.30 for Cu-N and 2.01-2.40 for Cu-O. CuMo-film exhibits photo-switchable magnetization with T $_{C}$ = 18 K and dielectric relaxation related to the hydrogen bond network. The change of activation energy (E $_{a}$ ) of the dielectric relaxation around 157 K (from E $_{a}$ = 49.9 kJ mol $^{-1}$ to E $_{a}$ = 27.3 kJ mol $^{-1}$ on cooling) suggests that the development of the hydrogen bond network occurs below 157 K.

Language	:	English
Journal	:	Inorganica Chimica Acta
Volume	:	550
Number	:
Pages	:	p.121434_1 - 121434_8
Publication Year/Month	:	2023/03
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Paper URL	:	https://doi.org/10.1016/j.ica.2023.121434
DOI for research data	:
Keywords	:	XAFS; シアノ架橋; CuMo薄膜
Research Facility	:	SPring-8(大型放射光施設)
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:	東京大学

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Registration No. : AA20221052
JAEA Abstracts No. : 51000793
Paper Submission No. : 26728

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