A Series of POM-Viologen Photo-/Electrochromic Hybrids and Hydrogels Acting as Multifunctional Sensors for Detecting UV, Hg, and Organic Amines.

In this work, POM anions were introduced into the viologen system in order to synthesize POM-viologen hybrid compounds with excellent properties. Three new POM-viologen compounds, {Cd(tybipy)(DMF)[β-MoO]Cl} (), {Co(tybipy)(DMF)[H(β-MoO)]}·4CHN (), and (tybipy)·(β-MoO) () (tybipy·Br = 1-thiophen-3-ylmethyl-[4,4']bipyridinyl-1-ium bromide), have been prepared by a solvothermal method, and their structures were characterized. POM anions are modified by mixing organic ligands with transition metals in compounds and .

Polyoxometalate-Viologen Thermochromic Hybrids for Organic Amine Detectors and Memristors with Temperature-Regulating Resistance Switching Characteristics.

There are relatively few reports on the combination of viologen and polyoxometalates (POMs). Herein, we successfully synthesized three viologen-POM-based compounds by in situ transformation of ligands under hydrothermal conditions, namely, {M(1,4-cby)[H(γ-MoO)]}·nHO (: M = Ni, = 4; : M = Co, = 6), and [Ni(1,3-cby)(HO)(β-MoO)]·2HO () (1,4-cby·Cl = 1-(4-carboxy-benzyl)-[4,4']bipyridinyl-1-ium, 1,3-cby·Cl = 1-(3-carboxy-benzyl)-[4,4']bipyridinyl-1-ium). Isostructural compounds and exhibit two-dimensional (2D) layer structures with POMs as linking nodes, while compound shows a one-dimensional (1D) metal-organic chain with dissociative POM anions.