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Tris-Alkoxylphenylterpyridine Cobalt(II) Complexes: Synthesis, Structure, and Magnetic and Mesomorphic Behaviors

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Abstract

Two novel cobalt(II) complexes [Co(L1)2](BF4)2·CH3CN·0.5H2O (1) and [Co(L2)2](BF4)2 (2) (L1 = 4′-(3,4,5-trimethoxy-phenyl)-[2,2′:6′,2″]terpyridine, L2 = 4′-(3,4,5-tris-hexadecyloxy-phenyl)-[2,2′:6′,2″]terpyridine) have been synthesized, and their structural, magnetic and mesomorphic properties were characterized by single crystal X-ray diffraction (XRD) analysis, temperature-dependent magnetic susceptibility, POM, DSC, and powder XRD analysis. The molecular structure of the complex 1 with short alkyl substituents exhibited that the metal ion has an N6 coordination sphere of distorted octahedral geometry and various intermolecular π–π interactions are important factors influencing the crystalline array. The magnetic behaviour of 1 displayed a typical of gradual spin transition for cobalt(II) terpyridine complexes. On the other hand, the complex 2 possessing linear long alkyl chains showed a gradual spin transition between low-spin and high-spin with a thermal hysteresis loop (T 1/2↑ = 338 and T 1/2↓ = 327 K) triggered by the crystal-to-mesophase transition. The powder XRD and POM analyses were indicative of the liquid crystalline lamellar phase of 2.

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Acknowledgments

This work was supported by Innovative Areas “Coordination Programming” (area 2017) from the MEST, Japan. Y. H. Lee was also supported by the JSPS program of Postdoctoral Fellowships for Foreign Researchers (No. 2200341).

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Authors and Affiliations

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

    Young Hoon Lee, Mohammad Razaul Karim, Yukino Ikeda, Tetsuya Shimizu & Shinya Hayami

  2. Department of Chemistry, Faculty of Science, Fukuoka University, Nanakuma, Jonan-Ku, Fukuoka, 814-0180, Japan

    Satoshi Kawata

  3. Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan

    Akira Fuyuhiro

  4. JST, CREST, Sanbancho 5, Chiyoda-ku, Tokyo, 102-0075, Japan

    Shinya Hayami

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  1. Young Hoon Lee
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  2. Mohammad Razaul Karim
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  4. Tetsuya Shimizu
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Correspondence to Shinya Hayami.

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This paper is dedicated to Prof. Dr. Hiroshi Nishihara for his outstanding contribution to the field of metal-containing polymers.

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Lee, Y.H., Karim, M.R., Ikeda, Y. et al. Tris-Alkoxylphenylterpyridine Cobalt(II) Complexes: Synthesis, Structure, and Magnetic and Mesomorphic Behaviors. J Inorg Organomet Polym 23, 186–192 (2013). https://doi.org/10.1007/s10904-012-9729-1

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  • DOI: https://doi.org/10.1007/s10904-012-9729-1

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