Issue 44, 2021

A series of polyoxometalate-based hybrid complexes constructed by a tripodal ligand containing mixed N/O donors

Abstract

By changing the transition metals (TMs) and polyanions, six polyoxometalate (POM)-based complexes 1–6 were synthesized by the hydrothermal method, namely [CdII(L1)2(HPMo12O40)]·2H2O (1), {MII2(H2O)4(L1)2[H2(β-Mo8O26)]}n·xH2O (n = 1, x = 1, M = Co (2), Cu (3), Fe (4); n = 0.5, x = 0, M = Ni (5), Zn (6)). The organic component 3,5-bis-(2,5-dihydro-imidazole-1-yl)benzoic acid (L1) is a tripodal ligand containing two imidazole and one carboxylic acid group. The N donors in the imidazole groups and the O donors in the carboxylic acid group of L1 can coordinate with different transition metal atoms to construct POM-based complexes. In complex 1, the Keggin anions are linked by [Cd(L1)2]2+ subunits to construct a chain. Complexes 2–6 are isostructural with [β-Mo8O26]4− anions linked by double metal–organic chains to build a 2D layer. The electrochemical behaviour and photocatalytic properties of these complexes were studied. These complexes can be used as amperometric sensors for the amperometric detection of Cr(VI), Fe(III) and H2O2. Moreover, these complexes can be used for fluorescence selective sensing of Cr3+.

Graphical abstract: A series of polyoxometalate-based hybrid complexes constructed by a tripodal ligand containing mixed N/O donors

Supplementary files

Article information

Article type
Paper
Submitted
03 9 2021
Accepted
15 10 2021
First published
16 10 2021

CrystEngComm, 2021,23, 7846-7854

A series of polyoxometalate-based hybrid complexes constructed by a tripodal ligand containing mixed N/O donors

J. Ying, L. Jin, H. Yu, A. Tian and X. Wang, CrystEngComm, 2021, 23, 7846 DOI: 10.1039/D1CE01195B

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