Molecular recognition and photoprotection of riboflavin in water by a biomimetic host

Abstract

A water-soluble tetralactam macrocycle is synthesized and characterized. This macrocycle is able to strongly bind riboflavin (Ka >107 M−1) in water and provides strong photoprotection of riboflavin upon UV irradiation.

g‐C3N4 Nanosheet Nanoarchitectonics: H2 Generation and CO2 Reduction

“…[12,31] And as the ratio of non-crystalline component increases, the charge carrier separation and transport efficiency of the materials can be improved. [33,37,59,69] Due to the hard-to-control thermal polymerization process utilized for fabricating layered g-C 3 N 4 , it is still difficult to precisely control and adjust the microstructure of layered g-C 3 N 4 materials for attaining enhanced electro-/photo-catalytic activities.…”

“…Moreover, we also successfully developed ultrathin red g-C 3 N 4 nanosheets via a molten-salt-assisted method and the red g-C 3 N 4 nanosheets with porous structure were used as the seeds to edge-epitaxially deposit yellow g-C 3 N 4 nanosheets onto red g-C 3 N 4 nanosheets. [59] Due to the unique crystallinity, porous structure, and composition difference in-between the yellow and the red g-C 3 N 4 nanosheets, the photogenerated carrier separation and transport efficiency as well as the photocatalytic performances of these ultrathin red/yellow g-C 3 N 4 homojunctions improved drastically (compared with conventional g-C 3 N 4 ). [59] Further investigation on the composition, band gap, and microstructure adjustment, as well as on construction of ultrathin g-C 3 N 4 homojunction/heterostructure for photocatalytic performance enhancement towards various applications is still sought after.…”

“…Since the photocatalytic performance can be greatly affected by the thickness of g-C 3 N 4 , exploitation on superior thin g-C 3 N 4 nanosheets has been a hot topic recently. [58][59][60] Although a variety of g-C 3 N 4 based catalysts constructed using the idea of nanoarchitectonics have been developed for various photocatalytic applications, studies on superior thin g-C 3 N 4 nanosheets based heterostructure photocatalysts in CO 2 photocatalytic conversion and water splitting are still in an early stage. [61][62][63][64] Only limited number of references can be found on nanoarchitectonics of superior thin g-C 3 N 4 materials, further exploitation on this topic is still greatly sought after.…”

When Molecules Meet in Water‐Recent Contributions of Supramolecular Chemistry to the Understanding of Molecular Recognition Processes in Water

“…Receptor 50 b has a high affinity also for heterocyclic substrates such as purine or pyrimidine bases [193] . The complex of 50 b with hypoxanthine has a log K a of 7.0 in water, for example, while an analog of 50 b with two disubstituted naphthalene residues, receptor 52 , has been shown to recognize riboflavin with a log K a of 7.1 [194] . An extraordinarily high log K a of 9.0 was observed for the complex between 50 a and the squaraine derivative 53 [195] …”

Tetralactam macrocycle based indicator displacement assay for colorimetric and fluorometric dual-mode detection of urinary uric acid

“…14 The water-soluble naphthalene-based tetralactam macrocycle (H1) has a wider cavity and can strongly bind riboflavin in water ( K a > 10 7 M −1 ). 15 The UV-vis and fluorescence spectra of the dye are significantly changed while encapsulated in H1, which lays a foundation for the construction of a dual-mode sensor. In the present work, we report a dual-mode colorimetric and fluorometric IDA sensor for urinary UA based on H1 (Fig.…”