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Networked Spin Cages: Tunable Magnetism and Lithium Ion Storage via Modulation of Spin-Electron Interactions

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journal contribution
posted on 09.09.2016, 11:34 by Guo-Hong Ning, Bingbing Tian, Li-Min Tan, Zijing Ding, Tun Seng Herng, Jun Ding, Kian Ping Loh
A networked spin cage comprising infinite CoII6L4 cages arrays (where Co = Co­(NCS)2 and L = 1,3,5-tri-(4-pyridyl)-verdazal radical) is synthesized and found to exhibit tunable magnetic and electrochemical properties via inclusion of guests. SQUID investigation reveals the coexistence of ferromagnetic and anti-ferromagnetic interactions between the Co­(II) ion center and radical ligands. Inclusion of electron-deficient guests (e.g., tetracyanoethylene) dramatically enhances spin concentration and increases anti-ferromagnetic interactions due to the formation of charge-transfer complex between the host and the guest. In addition, introduction of electron-rich guests (e.g., tetrathiafulvalene) into the networked spin cages doubles the capacity for binding the lithium ions.