Ionochromism and Increase in Fluorescence Quantum Yield of an Ether-Substituted Polysilylene upon Adding Lithium Ions in Solution

Synthesis of Silicon-Bridged Benzocrown Ethers and Their Ionochromism in the Emission Spectra Arising from Intramolecular π−π Stacking

“…West and co-workers found that a polysilane featuring ether side chains responds to Li + with respect to absorption and emission spectra, arising from conformational changes. 5 Kira et al demonstrated that p-disilanylacetophenone shows dual emission depending on the presence of Lu 3+ and Sc 3+ , due to intramolecular charge transfer induced by the complex formation with the metal ions. 6 In the hope of developing ion-sensing materials based on the Si-π system, we recently synthesized thienylene-disilanylene alternating oligomers having linear ether side chains on the thiophene rings.…”

“…Several approaches have been examined to develop π-conjugated molecules that respond to metal ions, for use as ion sensors. , Silicon-based ion-sensing molecules also have been studied, recently. West and co-workers found that a polysilane featuring ether side chains responds to Li + with respect to absorption and emission spectra, arising from conformational changes . Kira et al.…”

Preparation of Poly(silylene-p-phenylene)s Bearing a Benzo Crown Pendant Group and Their Iono- and Solvatochromic Behavior in the Emission Spectra

“…These polymers undergo stacking of the chromophores and/or conformational changes reversibly upon interaction with metal ions, which results in their ionochromic behaviors. Silicon-based ion-sensing polymeric systems have also been studied by West and co-workers . They found that an ether-substituted polysilane responds to Li + , with respect to both the absorption and emission spectra.…”

Solvophobically and Metal-Coordination-Driven Chirality Induction in Poly(m-phenylenedisilanylene)

“…Recently, a dynamic structural change, induced by internal or external physical or chemical stimuli, in molecular and supramolecular systems has attracted significant interest . In this context, it is interesting to note that polymer 1 is induced to twist the sense bias of the helical conformation even in dichloromethane when complexed with appropriate metal ions. − For example, addition of Li + to a dichloromethane solution of 1 results in the appearance of a positive Cotton effect, while the absorption band decreases slightly (Figure and Figure 12S). , On addition of either Na + or K + , however, a negative Cotton effect is observed, whereas the intensity of the absorption band does not change. This means the polymer assumes a helical conformation, the direction of which depends on the metal ion.…”