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Polar layered coordination polymers incorporating triazacyclononane-triphosphonate metalloligands

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Abstract

Reactions of metalloligands MIII(notpH3) (M = Fe, Co and notpH6 = 1,4,7-triazacyclononane-1,4,7-triyl-tris(methylenephosphonic acid)) with Zn(OAc)2 under hydrothermal conditions resulted in new metal phosphonates Zn2Fe(notp)Cl(H2O) (1) and ZnCo(notpH)(H2O)·2H2O (2). They crystallize in polar space groups P63 (for 1) and Pca21 (for 2), respectively, and exhibit layer structures in which the inorganic layers are separated by the organic groups of the notp ligands. However, the layer topologies of the two compounds are quite different. In 1, the layer contains 6-membered rings composed of one {FeN3O3} octahedron, one {Zn1O3Cl}, one {Zn2O4} and three {PO3C} tetrahedra via corner-sharing connections, while in 2, the layer contains 10-membered rings composed of two {CoO3N3} octahedra, three {ZnO4} and five {PO3C} tetrahedra via vertex-sharing connections. Dielectric measurements on single crystals of 2 confirmed the presence of high dielectric anisotropy. Proton conductivity measurements revealed that the proton conduction is more favourable in 2 due to the presence of a continuous hydrogen bond network in this compound.

Graphical abstract: Polar layered coordination polymers incorporating triazacyclononane-triphosphonate metalloligands

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Publication details

The article was received on 30 Sep 2019, accepted on 08 Nov 2019 and first published on 11 Nov 2019


Article type: Paper
DOI: 10.1039/C9DT03858B
Dalton Trans., 2020, Advance Article

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    Polar layered coordination polymers incorporating triazacyclononane-triphosphonate metalloligands

    S. Liu, S. Bao and L. Zheng, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT03858B

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