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Synthesis, structures and magnetic properties of two chiral mixed-valence iron(II, III) coordination networks

Abstract

Two rare chiral mixed-valence iron(II, III) coordination network D-and L-{[FeIIFeIII3O(BTC)3(DEF)3]∙0.5H2O}n (D-1 and L-1) (H3BTC = 1,3,5-benzenetricarboxylic acid; DEF = N,N-diethylformamide), have been synthesized without any chiral auxiliary under the solvothermal conditions and structurally characterized by the single crystal X-ray crystallography. Structural analysis indicates that these two polymers D-1 and L-1 are enantiomers. The only difference between D-1 and L-1 is that the framework of compound L-1 constructs of left-handed double helical chains, while D-1 is consists of right-handed double helical chains. Two distinct subunits (SBUs), {(μ3-O)FeIII3(COO)6(DEF)3} and {FeII(COO)6} are observed in both structures simultaneously. The integration of two distinct SBUs leads to a trinodal (3,3,6)-connected net with unusual structural topology. Interestingly, despite the achiral nature of H3BTC, the resulting framework exhibits rare chiral helical channels. The experiments show that dodecatungstosilic acid acts as catalyst which could increase the conversion of initial reactant. The magnetic studies indicate that antiferromagnetic interactions between Fe3+ ions. Additionally, the luminescence studies revealed that compound exhibited strong photoluminescent emissions at room temperature with a peak at 457 nm, owing to an intraligand charge transfer.

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Publication details

The article was received on 13 Sep 2017, accepted on 07 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7DT03411C
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Synthesis, structures and magnetic properties of two chiral mixed-valence iron(II, III) coordination networks

    Y. Xue, X. Tan, M. Zhou, H. Mei and Y. Xu, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03411C

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