An azido-bridged [FeII4] grid-like molecule showing spin crossover behaviour

Zhilin Guo, Maolin You, Yi-Fei Deng, Qiang Liu, Yin-Shan Meng, Zoe Pikramenou, Yuan-Zhu Zhang

Research output: Contribution to journalArticlepeer-review


The supramolecular self-assembly synthetic strategy provides a valid tool to obtain polynuclear Fe(II) complexes having effective communication between the metal centres and distinct spin crossover behaviour. Despite the great success in constructing various magnetic molecules, progress has not been made in SCO complexes based on azido bridges. In this article, the coordination-driven supramolecular assembly based on 3,6-substituted pyridazine and azide is presented to afford two Fe(II) grid-like complexes: [(L) 4FeII4(N 3) 4][BPh 4] 4·sol (1, L = 3,6-bis(3,5-dimethyl-1 H-pyrazol-1-yl)pyridazine and 2, L = 3,6-di(pyridin-2-yl)pyridazine). The substitution of pyridinyl groups in 2 instead of pyrazolyl ones in 1 led to the only example exhibiting spin-crossover behaviour ( T 1/2 = 230 K) among the azido-bridged complexes. In addition, a temperature-dependent photoluminescence study of 2 demonstrates a visible synergetic effect between the SCO event and the luminescence.

Original languageEnglish
Pages (from-to)14303-14308
Number of pages6
JournalDalton Transactions
Issue number40
Publication statusPublished - 19 Oct 2021


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