A disilane-bonded bis(methylpyridine) Cu(I) complex exhibiting reversible trigonal–tetrahedral switch with stimuli-responsive luminescence

Yoshinori Yamanoi; Yongjin Zhao; Toyotaka Nakae; Kaito Segawa; Masaki Yoshida; Masako Kato; Kazuma Kikuchi; Hiroaki Imoto; Kensuke Naka; Showa Kitajima; Hitoshi Kasai; Kouki Oka; Suguru Ito

doi:10.1039/D5DT01893E

A disilane-bonded bis(methylpyridine) Cu(i) complex exhibiting reversible trigonal–tetrahedral switch with stimuli-responsive luminescence

Yoshinori Yamanoi,

*^a Yongjin Zhao,^b Toyotaka Nakae,^a Kaito Segawa,^cd Masaki Yoshida,

^ce Masako Kato,

^c Kazuma Kikuchi,^f Hiroaki Imoto,

^f Kensuke Naka,

^f Showa Kitajima,^g Hitoshi Kasai,^g Kouki Oka

^g and Suguru Ito

*^b

Author affiliations

* Corresponding authors

^a Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
E-mail: ymanoi@chem.s.u-tokyo.ac.jp

^b Department of Chemistry and Life Science, Graduate School of Engineering Science, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
E-mail: suguru-ito@ynu.ac.jp

^c Department of Applied Chemistry for Environment, School of Biological and Environmental Sciences, Kwansei Gakuin University, 1 Gakuen Uegahara, Sanda, Hyogo 669-1330, Japan

^d Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

^e Department of Chemistry, Graduate School of Science, The University of Osaka, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan

^f Faculty of Molecular Chemistry and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

^g Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi 980-8577, Japan

Abstract

A stimuli-responsive tetranuclear copper(I) complex with 1,1,2,2-tetramethyl-1,2-bis(3-methylpyridin-2-yl)disilane (L1) showed reversible structural transformation between Cu₄I₄(L1)₂·2CH₃CN and Cu₄I₄(L1)₂. The change altered copper coordination from a tetrahedral to trigonal type as confirmed by XRD. The solvated form showed stronger blue-green emission (λ_em = 493 nm, Φ = 0.56) than the desolvated form (λ_em = 471 nm, Φ = 0.06). The change in emission intensity in the crystalline state was attributed to the change in structural rigidity or flexibility induced by the coordination or non-coordination of CH₃CN to the Cu(I) center.

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A disilane-bonded bis(methylpyridine) Cu(i) complex exhibiting reversible trigonal–tetrahedral switch with stimuli-responsive luminescence

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A disilane-bonded bis(methylpyridine) Cu(I) complex exhibiting reversible trigonal–tetrahedral switch with stimuli-responsive luminescence

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