Multi-stimuli-responsive materials have garnered widespread attention due to their exceptional potential in various applications, including optical anti-counterfeiting devices, sensor technology, and information storage materials. In this study, we demonstrate the synthesis of four polyoxometalates/viologens (POMs/Vios)-based compounds featuring remarkable color-changing performance, namely, [Zn(HL)(HO)(TeMoO)]·6HO (1), [Co(HL)(HO)(TeMoO)]·4HO (2), [Zn(TeMoO)(HO)]·L·6HO (3), [Co(TeMoO)(HO)]·L·6HO (4) (L·Cl = 1,1'-[1,3-phenylenebis(methylene)] bis-(4,4'-bipyridine) dichloride). Compounds 1, 3, and 4 exhibit rapid and reversible photochromic properties, making them suitable for applications in erasable inkless printing and information storage. Furthermore, hydrogels based on these compounds can act as ultraviolet detectors. An innovative electrochromic (EC) hydrogel can be prepared by incorporating compounds 1-4 into polyacrylamide (PAAm). The integrated electrochromic devices (ECDs) based on EC hydrogel can precisely switch between the coloring and fading states through the precise control of different voltages. They are characterized by simple operation, high sensitivity, and low-voltage drive (ranging from -0.21 to -0.35 V). Additionally, compounds 1-4 act as highly efficient organic amine gas sensors. This work is anticipated to provide inspiration for the systematic design and development of diverse color-changing materials that respond to multiple external stimuli.
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