Proton-conducting layered structures based on transition metal oxo-clusters supported by Sb(iii) tartrate scaffolds.

Author(s) Ma, W.; Hu, B.; Jing, K.; Li, Z.; Jin, J.; Zheng, S.; Huang, X.
Journal Dalton Trans
Date Published 2020 Mar 28

Two transition metal-antimony oxo-cluster based compounds, H{MCd(HO)[M(HO)CoSbSb(μ-O)(l-tta)]}·7HO (1) (M = Cd + Co) and HK(HO){Cd(HO)[Cd(HO)FeCdSb(μ-O)(μ-O)(l-tta)][Cd(HO)FeCdSb(μ-O)(μ-O)(l-tta)][Cd(HO)FeCdSb(μ-O)(μ-O)(l-tta)Cd(HO)]}·17HO (2) (L-Htta = l-tartaric acid) were hydrothermally synthesized and characterized. Compound 1 features a [MCoSbSb(μ-O)(l-tta)(HO)] cluster, while compound 2 contains three types of clusters, namely, [Cd(HO)FeCdSb(μ-O)(μ-O)(l-tta)], [Cd(HO)FeCdSb(μ-O)(μ-O)(l-tta)] and [Cd(HO)FeCdSb(μ-O)(μ-O)(l-tta)Cd(HO)]. All the clusters are of sandwich-type with {Sb(μ-O)(l-tta)} scaffolds on the top and bottom. The Cd (and M in 1) ions interconnect the clusters into layered structures in both compounds. To the best of our knowledge, this is the first report of transition metal-antimony oxo-clusters that simultaneously contain the first-row and second-raw transition metal ions, and compound 1 represents the first example of such type of clusters that contain Sb(v). The two compounds exhibit proton conductivity with the values of 2.43 × 10 and 2.95 × 10 S cm at 85 °C under 98% relative humidity, respectively.

DOI 10.1039/c9dt04333k
ISSN 1477-9234
Citation Dalton Trans. 2020;49(12):38493855.