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Single-ion magnet behavior of two pentacoordinate CoII complexes with a pincer ligand 2,6-bis(imidazo[1,5-a] pyridin-3-yl)pyridine

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Abstract

Two new air-stable mononuclear pentacoordinate CoII complexes [Co(bpip)(NCS)2] (1) and [Co(bpip)Br2] (2), which are based on a NNN-pincer ligand 2,6-bis(imidazo[1,5-a]pyridin-3-yl)pyridine (abbreviated as bpip), were successfully synthesized and structurally characterized. Although two different halogen and pseudohalogen terminal ligands were employed, single-crystal X-ray crystallographic analyses revealed that the CoII center of 1 and 2 adopts C4v symmetry and displays the similar distorted square-pyramidal geometry. Magnetic studies showed that two compounds exhibit slow magnetic relaxation in the presence of an applied dc field, namely, they display the behavior of single-ion magnets (SIMs). The reported two complexes enrich the chemistry of cobalt(II) single-ion magnets (SIMs) with low coordination numbers and highlight the differences in the magnetic behaviors caused by the different terminal ligands.

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Funding

Financial support was from Natural Science Foundation of China (21272167, 21772140, and 21771136), Natural Science Foundation of Jiangsu Province of China (BK20171213), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institution, and the project of scientific and technologic infrastructure of Suzhou (SZS201708).

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Authors and Affiliations

  1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China

    Yanfeng Cui, Yu Ge & Yahong Li

  2. Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China

    Yanfeng Cui & Yaping Dong

  3. Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing, 210023, China

    Jin Tao

  4. Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou, 215009, China

    Jinlei Yao

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  1. Yanfeng Cui
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Cui, Y., Ge, Y., Li, Y. et al. Single-ion magnet behavior of two pentacoordinate CoII complexes with a pincer ligand 2,6-bis(imidazo[1,5-a] pyridin-3-yl)pyridine. Struct Chem 31, 547–555 (2020). https://doi.org/10.1007/s11224-019-01429-3

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