Tuning the Spin States of Two Apical Iron(II) Ions in a Pentanuclear Iron(II) Cluster Helicate through the Choice of Anions

Author： Fan Kuan-Hui Huang Qi Fang Xiao-Yu Zhu Lian-Wen Yan Zheng

Publisher： MDPI

E-ISSN： 2073-4352|8|3|119-119

ISSN： 2073-4352

Source： Crystals, Vol.8, Iss.3, 2018-03, pp. : 119-119

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Abstract

Spin-crossover clusters with iron(II) high nuclearity are rare. By using 3,5-bis(pyridin-2-yl)-1,2,4-triazole (bptH) as the ligand with two bidentate chelating sites, we successfully obtained three pentanuclear iron(II) cluster helicate compounds [{Fe^II(μ-bpt)₃}₂Fe^II₃(μ₃-O)][Fe^II₂(μ-Br)(μ-bpt)(NCS)₄(H₂O)]·2H₂O·C₂H₅OH (1), [{Fe^II(μ-bpt)₃}₂Fe^II₃(μ₃-O)][Fe^II₂(μ-bpt)₂(NCS)₄] (2), and [{Fe^II(μ-bpt)₃}₂Fe^II₃(μ₃-O)]I₂·2C₂H₅OH (3). Research on single-crystal structure and magnetism has indicated that tuning the spin state of two iron(II) ions in axial direction is successfully realized by regulating the different counter anions: one apical [Fe^II(bpt)₃]⁻ unit exhibits spin-crossover behavior while the other [Fe^II(bpt)₃]⁻ unit remains in low spin state in 1, both apical ions are of high spin states in 2, and are of low spin states in 3.