Dynamic metal-ligand coordination for multicolour and water-jet rewritable paper

Abstract

Rewritable paper has recently become prevalent in both academic research and marketplace due to the potential environmental advantages, including forest conservation, pollution reduction, energy saving and resource sustainability. However, its real-life applications are limited by a lack of effective strategy to realize multicolour and water-jet printing on rewritable paper with long legible image-lasting times. Herein, we report an effective strategy to construct rewritable paper based on colour or luminescence switching induced by dynamic metal–ligand coordination. This type of rewritable paper can be conveniently utilized for multicolour water-jet printing by using aqueous solutions containing different metal salts as ink. In addition, the printed images on the water-jet rewritable paper can be retained for a long time (> 6 months), which shows great progress compared to previous work. We believe that this type of rewritable paper could be considered as a prototype for multicolour water-jet printing to meet the practical needs.

Terpyridine Functionalized Oligothiophene: Cadmium(II) Ion Sensing via Visualization and Fluorescence

“…Fluorescence spectroscopy measurements also confirmed that addition of Cd 2+ or Zn 2+ results in stantaneous red shift of the maximum emission of the fluorophore with different fluorescence intensities and emission maximum in their methanol solution (Figure B). Theoretically, the appearance of new absorption and emission peaks when 3T‐Terpy chelated with Zn 2+ and Cd 2+ can be attributed to the ICT transitions . Alkali and alkaline earth metal ions such as Na + , K + , Mg 2+ , Ba 2+ hardly show any noticeable alteration to the fluorescence emission of the compound.…”

“…And the emission spectra shown in the Figure B indicates that Cu 2+ and Ni 2+ are efficient quenchers of the emission. It was explained that when 3T‐Terpy chelated with Ni 2+ and Cu 2+ , π ‐ π * transitions or d ‐ d transitions are responsible for the changes in the absorption spectra . Interestingly, it also represents that distinct yellowish color change for Cd 2+ and Zn 2+ at room light.…”

Colloidally Stable Monolayer Nanosheets with Colorimetric Responses

“…Furthermore, inkjet printing has attracted tremendous attention owing to the facile construction of light‐weight, flexible, and disposable devices, especially the defined deposition of functional materials . The aqueous stable chromogenic PDA‐EDMA‐TMG nanosheet can reach a concentration as high as 20 mg mL −1 (≈33 × 10 −3 m , according to the diacetylene monomer), which affords a great opportunity for inkjet printing.…”

Multi-color Reversible Photochromisms via Tunable Light-Dependent Responses

“…Smart materials that show reversible optical responses to different chemical and physical stimuli have led to the development of numerous optical devices finding wide applications as sensors, [1][2][3] security devices, 4,5 smart windows, 6,7 and information displays. [8][9][10][11] The stimuli sources including pH, 12 electricity, 13 temperature, 14 solvent, 15 mechanical deformation, 16 and light 17 show promise as external stimuli to control the response of the materials in both liquid and solid phases. Among the various stimuli applicable to induce reversible color-changing responses, light has become of particular interest because of the absence of direct contact with the sample, the possibility for long-distance control, and versatile control over the various properties of light such as wavelength, intensity, and time of irradiation.…”