Anthryl-functionalized cyanide-bridged Fe/Co cubes

Qi Liu; Yue Cheng; Shihao Liu; Zi-Yi Chen; Yuan-Zhu Zhang

doi:10.1039/d3dt01630g

Anthryl-functionalized cyanide-bridged Fe/Co cubes

Dalton Trans. 2023 Sep 19;52(36):12878-12884. doi: 10.1039/d3dt01630g.

Authors

Qi Liu¹, Yue Cheng¹, Shihao Liu¹, Zi-Yi Chen¹, Yuan-Zhu Zhang¹

Affiliation

¹ Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China. chenzy@sustech.edu.cn.

PMID: 37641912
DOI: 10.1039/d3dt01630g

Abstract

Two anthryl-functionalized cyanide-bridged [Fe₄Co₄] cube complexes, [(pzTp)Fe(CN)₃Co(TpEtOAn)]₄[OTf]₄·8MeCN·7Et₂O (1) and [NEt₄]₃[(pzTp)Fe(CN)₃Co(TpEtOAn)]₄[OTf]₇·5MeCN·2Et₂O (2) (pzTp^- = tetrapyrazolylborate, TpEtOAn = 2,2,2-tris-(pyrazol-1-yl)ethoxy(9-methyl-anthracene)), were synthesized and characterized. The crystallographic study revealed that the [Fe₄Co₄] cubes are arranged into a linear supramolecular chain through significant anthryl-anthryl π-π stacking interactions in complex 1, whereas a zigzag supramolecular 1D assembly is observed in 2. The magnetic measurements showed that both compounds exhibited incomplete transitions from the paramagnetic {FeIIILS(μ-CN)CoIIHS} state to the diamagnetic {FeIILS(μ-CN)CoIIILS} state at about 200 K. The luminescence measurement of 1 in solution revealed an enhancement of the emission upon dilution or addition of perfluoronaphthalene (PFN) molecules, which could be attributed to the suppression of the aggregation-caused quenching (ACQ) effect, suggesting possible aggregation of the cube units in the solution.