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Polymorphic layered copper phosphonates: exfoliation and proton conductivity study

Abstract

Three polymorphic copper carboxylate-phosphonates are reported, namely, α-Cu(4-cnappH)(H2O) (α-Cu-1), α-Cu(4-cnappH)(H2O)·0.5H2O (α-Cu-2) and β-Cu(4-cnappH)(H2O) (β-Cu), where 4-cnappH3 is (4-carboxynaphthalen-1-yl)phosphonic acid. All show layer structures but with different layer topologies. The layer topologies of the α-phases are similar, where the distorted {CuO4} planes and {PO3C} tetrahedra are corner-shared forming an inorganic layer containing 8- and 16-member rings. In -Cu, double chains made up of corner-sharing {CuO5} and {PO3C} are crossed-linked through edge-sharing of the {CuO5} square pyramids to form an inorganic layer containing 4-, and 8-member rings. The uncoordinated carboxylate groups are protonated and are involved in the interlayer hydrogen bonds in all cases. Antiferromagnetic interactions are dominant in all cases. Compounds α-Cu-1, α-Cu-2 and β-Cu can be exfoliated in THF resulting in 2D nanosheets of mainly two-layer thickness. Proton conductivity measurements reveal that the proton conduction is more favorable in α-Cu-2 than in α-Cu-1, but exfoliation into nanosheets decreases the conductivity.

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Publication details

The article was received on 05 Mar 2019, accepted on 06 Apr 2019 and first published on 09 Apr 2019


Article type: Paper
DOI: 10.1039/C9DT00970A
Citation: Dalton Trans., 2019, Accepted Manuscript

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    Polymorphic layered copper phosphonates: exfoliation and proton conductivity study

    B. Liu, J. Liu, Y. Shen, J. Feng, S. Bao and L. Zheng, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT00970A

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