Volume 132, Issue 26 pp. 10745-10752
Forschungsartikel

CO2-Induced Spin-State Switching at Room Temperature in a Monomeric Cobalt(II) Complex with the Porous Nature

Dr. Manabu Nakaya

Dr. Manabu Nakaya

Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555 Japan

Search for more papers by this author
Dr. Wataru Kosaka

Dr. Wataru Kosaka

Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577 Japan

Search for more papers by this author
Prof. Dr. Hitoshi Miyasaka

Corresponding Author

Prof. Dr. Hitoshi Miyasaka

Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577 Japan

Search for more papers by this author
Yuki Komatsumaru

Yuki Komatsumaru

Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555 Japan

Search for more papers by this author
Dr. Shogo Kawaguchi

Dr. Shogo Kawaguchi

Diffraction & Scattering Division Japan, Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198 ( Japan

Search for more papers by this author
Dr. Kunihisa Sugimoto

Dr. Kunihisa Sugimoto

Diffraction & Scattering Division Japan, Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198 ( Japan

Search for more papers by this author
Dr. Yingjie Zhang

Dr. Yingjie Zhang

Australian Nuclear Science and Technology Organization, Locked Bag 2001, Kirrawee DC, NSW, 2232 Australia

Search for more papers by this author
Dr. Masaaki Nakamura

Dr. Masaaki Nakamura

Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555 Japan

Search for more papers by this author
Leonard F. Lindoy

Leonard F. Lindoy

School of Chemistry, The University of Sydney, Sydney, NSW, 2006 Australia

Search for more papers by this author
Prof. Dr. Shinya Hayami

Corresponding Author

Prof. Dr. Shinya Hayami

Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555 Japan

Institute of Pulsed Power Science (IPPS), Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555 Japan

Search for more papers by this author
First published: 18 March 2020
Citations: 7

Abstract

CO2-responsive spin-state conversion between high-spin (HS) and low-spin (LS) states at room temperature was achieved in a monomeric cobalt(II) complex. A neutral cobalt(II) complex, [CoII(COO-terpy)2]⋅4 H2O (1⋅4 H2O), stably formed cavities generated via π–π stacking motifs and hydrogen bond networks, resulting in the accommodation of four water molecules. Crystalline 1⋅4 H2O transformed to solvent-free 1 without loss of porosity by heating to 420 K. Compound 1 exhibited a selective CO2 adsorption via a gate-open type of the structural modification. Furthermore, the HS/LS transition temperature (T1/2) was able to be tuned by the CO2 pressure over a wide temperature range. Unlike 1 exhibits the HS state at 290 K, the CO2-accomodated form 1⊃CO2 (Purn:x-wiley:00448249:media:ange202003811:ange202003811-math-0001 =110 kPa) was stabilized in the LS state at 290 K, probably caused by a chemical pressure effect by CO2 accommodation, which provides reversible spin-state conversion by introducing/evacuating CO2 gas into/from 1.

Conflict of interest

The authors declare no conflict of interest.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.