A series of isopolymolybdate–viologen hybrids with photo-, thermo- and electro-chromic properties

Abstract

Under solvothermal and hydrothermal conditions, by introducing three symmetric viologen ligands into the POMs based hybrid materials, we successfully constructed four POMs-viologen inorganic-organic hybrid compounds, namely (1,3–bcbpy)2·(δ–Mo8O26) (1) (1,3–bcbpy·2Cl =...

Four POM-Viologen Color-Changing Materials with Fast Color Response under Various External Stimuli

“…In addition, in order to study the difference in the ultraviolet response between compounds 1 and 2 , we studied their photochromic kinetics. The kinetic equation is as follows , ln ( A 0 − A ∞ ) / ( A t − A ∞ ) = italicKt Here, A 0 , A t , and A ∞ refer to the absorbance intensity of photochromic start time, time t , and end time, respectively. K is the rate constant and t is the irradiation time under a xenon lamp.…”

Incorporation of a one-dimensional electron-rich chain in viologen-based coordination polymers for super photochromic properties and improved optical applications in polyvinyl alcohol film

“…According to earlier research, viologen-based materials can change color when heated because they depend on reversible one-electron redox cycling between the dicationic and radical cationic states. [36][37][38] 1 has thermochromic characteristics when heated in an air atmosphere. As shown in Fig.…”

“…According to previous literature research, the presence of ligands in the system may be responsible for the long emission time. [32][33][34][35][36][37][38][39][40][41][42][43][44] In the solid state, at room temperature, the emission lifetime at 518 nm is 4.45 ms. As the temperature decreases, the lifetime of the peak at 518 nm increases (100.84 ms), which is a phenomenon commonly observed in delayed fluorescence or phosphorescence. The nearly coincident positions of emissions with short and long lifetimes underscore the characteristic nature of delayed fluorescence in this system.…”

Photochromic Ln-Phosphonates Assembled by an Imidazole Derivative: Construction, Crystal Structures, and Light-Enhanced Proton Conductivity

“…The first approach is to reduce the activation energy of proton transfer or/and increase the number of proton carriers (such as H 2 O, NH 4 + , H 3 O + ). , However, it still confronts challenges in the current situation due to the fact that this method needs to comprehensively consider various factors that may affect the performance of proton conduction. The other approach is to introduce more acidic functional groups such as carboxylic acids, , sulfonic acids, , or phosphonic acids to enhance their acidity and hydrophilicity, thereby enriching the presence of hydrogen-bonding networks. − Evidently, the second method is more meaningful for improving proton conductivity owing to its chemical stability and structural diversity accompanied by the simple and facile operation procedure.…”