Pillar[5]arene-based [1]rotaxanes with salicylaldimine as the stopper: synthesis, characterization and application in the fluorescence turn-on sensing of Zn²⁺ in water

Abstract

Two pillar[5]arene-based [1]rotaxanes with salicylaldimine as the stopper were synthesized and characterized fully, which could be further applied in the fluorescence turn-on sensing of Zn2+ in water.

Mechanically interlocked luminescent molecules

“…As a common application of luminescent molecules, MILMs can also be used to construct sensors for the detection of chemicals. Yao et al [131] demonstrated a pillar [5]arenebased [1]rotaxane 79 with a salicylaldimine unit as the stopper (Figure 15a). Upon the addition of a metal ion, especially Zn(II), a remarkable fluorescence enhancement of non-fluorescent [1]rotaxane 79 was detected.…”

“…As a common application of luminescent molecules, MILMs can also be used to construct sensors for the detection of chemicals. Yao et al [131] . demonstrated a pillar[5]arene‐based [1]rotaxane 79 with a salicylaldimine unit as the stopper (Figure 15a).…”

Pillar[5]arene-based supramolecular pseudorotaxane polymer material for ultra-sensitive detection of Fe3+ and F−

“…Pseudorotaxanes, a type of typical molecular machine built by interlocked molecules, 8 have been greatly implied in drug delivery, [9][10][11] conducting materials, 12,13 articial molecular machines, 14 gene delivery, 15,16 functional bioimaging, 17 supraamphiphiles, 18,19 as well as functional supramolecular systems. [20][21][22][23] The supramolecular polymers created from pseudorotaxanes can sense, process, and actuate responses to external change on their own because of the dynamic and reversible nature of noncovalent interactions. 24,25 Due to this characteristic, supramolecular polymers have a considerable advantage over other materials when used as ultrasensitive response material.…”

Metallo‐Supramolecular Structures Binding CO2: Self‐Assembly of Fluorescent Nanoparticles Based on Pyridine Derivatives of Pillar[5]arene and Cu(I)

“…This can be achieved by pre-organization of macrocyclic polyfunctional ligands, in which the formation of inclusion complexes with guest molecules takes place due to the presence of a free macrocyclic cavity together with metal-ligand complexation. [17] Pillar[n]arene platform is most suitable for this purpose due to ease of functionalization, [18][19][20][21][22] high metal binding characteristics, [23,24] the tendency to fluorescent assembly [25,26] and the ability to absorb and detect CO 2 . [27][28][29] Meanwhile difficulty in obtaining the target supramolecular system and binding CO 2 only in solution are main drawbacks of all currently existing systems for CO 2 binding based on pillar[n]arenes.…”