Volume 59, Issue 36 pp. 15741-15749
Research Article

Octacyanidorhenate(V) Ion as an Efficient Linker for Hysteretic Two-Step Iron(II) Spin Crossover Switchable by Temperature, Light, and Pressure

Dr. Szymon Chorazy

Corresponding Author

Dr. Szymon Chorazy

Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland

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Tomasz Charytanowicz

Tomasz Charytanowicz

Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland

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Dr. Dawid Pinkowicz

Dr. Dawid Pinkowicz

Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland

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Junhao Wang

Junhao Wang

Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan

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Dr. Koji Nakabayashi

Dr. Koji Nakabayashi

Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan

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Stephen Klimke

Stephen Klimke

Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstrasse 9, 30167 Hannover, Germany

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Prof. Dr. Franz Renz

Prof. Dr. Franz Renz

Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstrasse 9, 30167 Hannover, Germany

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Prof. Dr. Shin-ichi Ohkoshi

Prof. Dr. Shin-ichi Ohkoshi

Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan

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Prof. Dr. Barbara Sieklucka

Corresponding Author

Prof. Dr. Barbara Sieklucka

Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland

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First published: 02 June 2020
Citations: 88

Graphical Abstract

Perfect rhenium mediator: Octacyanidorhenate(V) ion is presented as a promising molecular precursor for the construction of an advanced spin-crossover material linking a multistep spin transition with strong cooperativity. An anionic layered FeII-ReV cyanido-bridged framework non-covalently bonded to Cs+ counterions is reported. It exhibits a two-step hysteretic FeII spin-crossover effect controlled by temperature, light irradiation, and pressure.

Abstract

A two-step hysteretic FeII spin crossover (SCO) effect was achieved in programmed layered Cs{[Fe(3-CNpy)2][Re(CN)8]}⋅H2O (1) (3-CNpy=3-cyanopyridine) assembly consisting of cyanido-bridged FeII-ReV square grid sheets bonded by Cs+ ions. The presence of two non-equivalent FeII sites and the conjunction of 2D bimetallic coordination network with non-covalent interlayer interactions involving Cs+, [ReV(CN)8]3− ions, and 3-CNpy ligands, leads to the occurrence of two steps of thermal SCO with strong cooperativity giving a double thermal hysteresis loop. The resulting spin-transition phenomenon could be tuned by an external pressure giving the room-temperature range of SCO, as well as by visible-light irradiation, inducing an efficient recovery of the high-spin FeII state at low temperatures. We prove that octacyanidorhenate(V) ion is an outstanding metalloligand for induction of a cooperative multistep, multiswitchable FeII SCO effect.

Conflict of interest

The authors declare no conflict of interest.

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