The impact of halogen ions on the guest dependent spin crossover behaviour and porosity of Co(II) one-dimensional coordination polymers [CoX2(4′-(4-pyridyl)-2,2′:6′,2′′-terpyridine)] (X = Cl and Br)

Ryo Ohtani; Kodai Shimayama; Akio Mishima; Masaaki Ohba; Ryuta Ishikawa; Satoshi Kawata; Masaaki Nakamura; Leonard F. Lindoy; Shinya Hayami

doi:10.1039/C5TC00864F

The impact of halogen ions on the guest dependent spin crossover behaviour and porosity of Co(ii) one-dimensional coordination polymers [CoX₂(4′-(4-pyridyl)-2,2′:6′,2′′-terpyridine)] (X = Cl and Br)†

Ryo Ohtani,^a Kodai Shimayama,^a Akio Mishima,^b Masaaki Ohba,^b Ryuta Ishikawa,^c Satoshi Kawata,^c Masaaki Nakamura,^a Leonard F. Lindoy^d and Shinya Hayami*^ae

Author affiliations

* Corresponding authors

^a Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
E-mail: hayami@sci.kumamoto-u.ac.jp

^b Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan

^c Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan

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

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

Abstract

Discrete Co(II) spin crossover (SCO) compounds have attracted much attention for constructing highly sensitive molecular devices; however, the use of Co(II) SCO-coordination polymers (CPs) in such applications is extremely limited. The syntheses of the one-dimensional Co(II) SCO-CPs, [CoX₂(pyterpy)] (pyterpy = 4′-(4-pyridyl)-2,2′:6′,2′′-terpyridine; X = Cl (1), Br (2)), are presented. The structure of 1 shows a ‘closed’ packing arrangement that exhibits gate-type water adsorption at room temperature while 2 has an ‘open’ packing arrangement that shows type I water adsorption behaviour at room temperature. In addition, both 1 and 2 adsorb CO₂ at 201 K. Following water adsorption, 1·H₂O and 2·H₂O showed cooperative SCO at 226 K and 299 K, respectively.

This article is part of the themed collections: 2015 Journal of Materials Chemistry C Hot Papers and Spin State Switches in Molecular Materials Chemistry

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Article information

DOI: https://doi.org/10.1039/C5TC00864F
Article type: Paper
Submitted: 28 Cig 2015
Accepted: 30 Agd 2015
First published: 30 Agd 2015

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J. Mater. Chem. C, 2015,3, 7865-7869

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The impact of halogen ions on the guest dependent spin crossover behaviour and porosity of Co(II) one-dimensional coordination polymers [CoX₂(4′-(4-pyridyl)-2,2′:6′,2′′-terpyridine)] (X = Cl and Br)

R. Ohtani, K. Shimayama, A. Mishima, M. Ohba, R. Ishikawa, S. Kawata, M. Nakamura, L. F. Lindoy and S. Hayami, J. Mater. Chem. C, 2015, 3, 7865 DOI: 10.1039/C5TC00864F

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Journal of Materials Chemistry C