Facile construction of terpridine-based metallo-polymers in hydrogels, crystals and solutions directed by metal ions

A multi-cation responsive Ni(ii)-supramolecular metallogel mimics a molecular keypad lockviareversible fluorescence switching

“…Amplitude-sweep and frequency-sweep measurements were executed to investigate the elastic nature of MG . 31 In amplitude-sweep measurements, Storage modulus ( G ′) and loss modulus ( G ′′) were computed in which G ′ states to the elastic modulus, describes the elastic behavior of the gel material, whereas the G ′′ states to the viscous modulus and reflects the flow behavior of the gel material, thereby showing the property of a semi-solid gel. 32 To get the mechanical stability of MG , varying concentrations of Ni 2+ (15 mg to 35 mg) were tested to a fixed concentration of HL (∼32.1 mg).…”

Redox-Responsive Colloidal Particles Based on Coordination Polymers Incorporating Viologen Units

“…The design of stimuli-responsive molecules and molecular materials is a subject of intense activity and emerges as an important challenge because of promising envisioned applications. − In this context, supramolecular polymers, in which monomeric units or chains are interconnected by noncovalent weak bonds, are particularly suitable components of stimuli-responsive systems because they may undergo large structural modifications under the effect of external inputs. − Among the different types of supramolecular polymers, soluble coordination polymers, in which bridging organic ligands are spontaneously interconnected by bonding with metal ions (Scheme ), may exhibit relevant properties for functional materials or devices. − Indeed, these metal-ion-assisted self-assemblies may possess the typical architectures and properties (viscoelasticity, processability, etc.) of covalent polymers, while the presence of coordination bonds in their main structure may provide supplemental ion-exchange, kinetic, optical, magnetic, redox, or mechanical properties that are of technological interest. ,− In particular, they may lead to a variety of stimuli-responsive features such as electrochromism, sol–gel transition, or self-healing. − …”