Controlling magnetic exchange coupling via coligands in three cyanide-bridged heterobimetallic complexes

• Published in: Inorganic chemistry communications 2018-11, Vol.97, p.83-87
• Main Authors: Liu, Xue-Ru, Meng, Yin-Shan, Jiao, Cheng-Qi, Hu, Ji-Xiang, Jiao, Yu-Shu, Liu, Tao
• Format: Article
• Language: English
• Subjects: Cyanide; Long-range magnetic ordering; One-dimensional chain
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2018.09.012

Three one-dimensional (1D) cyanide-bridged heterobimetallic chains {[FeIII(Tp)(CN)3]2CoII(mep)2}·2CH3OH (1; Tp = hydrotris(pyrazolyl)borate, mep = 4‑[(1E)‑2‑(4‑Methylphenyl)ethenyl]pyridine), {[FeIII(Tp)(CN)3]2CoII(eep)2}·2CH3OH (2; eep = 4‑[(1E)‑2‑(4‑Ethylphenyl)ethenyl]pyridine) and {[FeIII(Tp)(CN)3]4CoII2(nep)4}·3H2O·CH3OH (3; nep = 4‑[(1E)‑2‑(2‑Naphthalenyl)ethenyl]pyridine) have been synthesized via self-assembly of the same [FeIII(Tp)(CN)3]− unit and CoII ion in the presence of different N-substituted pyridine ligands. Magnetic measurements reveal that complex 1 exhibits ferromagnetic interactions and a long-range magnetic ordering below 3.5 K. Complex 2 shows antiferromagnetic long-range ordering below 3.3 K, while complex 3 shows a typical ferrimagnetic coupling at low temperatures. These results highlight the significant influence of the coligands on their magnetic properties. Three one-dimensional cyanide-bridged {FeIII2CoII}n chains with different N-substituted pyridine ligands were synthesized and characterized. Magnetic measurements reveal that complex 1 exhibits ferromagnetic interactions and a long-range magnetic ordering. Complex 2 shows antiferromagnetic long-range ordering, while complex 3 shows a typical ferrimagnetic coupling. The alteration of the coligands greatly influences the magnetic coupling interactions and finally results in different magnetic properties. [Display omitted] •Three one-dimensional cyanide-bridged {FeIII2CoII}n chains were synthesized.•Magnetic measurements indicated that three compounds displayed completely different behavior.•The alteration of the coligands results in different magnetic properties.