Field-induced single-ion magnet behavior in a hydrogen-bonded supramolecular cobalt(II) complex

• Published in: Polyhedron Vol. 213; p. 115614
• Main Authors: Shao, Dong, She, Shi-Yuan, Shen, Lin-Feng, Yang, Xiaodong, Tian, Zhengfang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2022
• Subjects: Cobalt; Hydrogen bonding; Magnetic anisotropy; Single-ion magnets; Supramolecular network; Single-ion magnets; Cobalt; Hydrogen bonding; Magnetic anisotropy; Supramolecular network
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2021.115614

Hydrogen-bonded supramolecular frameworks remain highly interesting for the development of novel porous materials. Herein a hydrogen-bonded supramolecular framework of a cobalt(II) complex, [Co(cpt)2(H2O)2] (Hcpt = 4-(p-carboxyphenyl)-1,2,4-triazole), was synthesized and structurally characterized. A single crystal X-ray diffraction (SC-XRD) study indicates that the monometallic Co2+ ion is located in a distorted octahedral geometry and the complex forms a two-dimensional supramolecular network, stabilized by significant intermolecular N···H interactions. Variable-temperature PXRD and TGA analysis experiments revealed considerable thermal stability of the supramolecular framework of the CoII complex. Magnetic studies showed that the distorted octahedral Co2+ ion exhibits considerable easy-plane magnetic anisotropy with D = 22.3 cm−1, while field-induced single-ion magnet (SIM) behavior was evidenced at low temperature. The forgoing results further highlight that a hydrogen-bonded supramolecular framework can be used as a great platform for the development of molecular nanomagnets. [Display omitted] Hydrogen-bonded supramolecular frameworks remain highly interesting for the development of novel porous materials. Herein a hydrogen-bonded supramolecular framework of a cobalt(II) complex, [Co(cpt)2(H2O)2] (Hcpt = 4-(p-carboxyphenyl)-1,2,4-triazole), was synthesized and structurally characterized. A single crystal X-ray diffraction (SC-XRD) study indicates that the monometallic Co2+ ion is located in a distorted octahedral geometry and the complex forms a two-dimensional supramolecular network stabilised by significant intermolecular N···H interactions. Variable-temperature PXRD and TGA analysis experiments revealed considerable thermal stability of the supramolecular framework of the CoII complex. Magnetic studies showed that the distorted octahedral Co2+ ion exhibits considerable easy-plane magnetic anisotropy with D = 22.3 cm−1, while field-induced single-ion magnet (SIM) behavior was evidenced at low temperature. The forgoing results further highlight that the hydrogen-bonded supramolecular framework could be used as a great platform for the development of molecular nanomagnets.