A thiazolo[5,4-d]thiazole functionalized covalent triazine framework showing superior photocatalytic activity for hydrogen production and dye degradation

Abstract

Covalent triazine frameworks (CTFs) which contain triazine ring structures similar to that of graphitic carbon nitride (g-C3N4) have a strong conjugation system, excellent visible light absorption capacity, and high chemical...

The synergy between a benzoselenadiazole covalent organic framework and TEMPO for selective photocatalytic aerobic oxidation of organic sulfides

“…[22][23][24][25] Typically, heterocycles are advantageous in synthesizing organic semiconductor materials due to their inherent characteristics. 26,27 As a photoactive electron-decient heterocycle, benzoselenadiazole is attractive for integration into photoactive semiconductors as it could present remarkable photophysical and adjustable optoelectronic characteristics. 28,29 To date, benzoselenadiazole-based materials have been widely explored in organic photovoltaic devices to improve intramolecular electron transfer.…”

Metal-Free Highly Stable and Crystalline Covalent Organic Nanosheet for Visible-Light-Driven Selective Solar Fuel Production in Aqueous Medium

“…TTA has a much smaller dihedral angle between the phenyl and triazine units (∼7.7°) compared to its benzene-centered analogue (38.3°), and the triazine moiety is well known for its photoactive functionalities. ,− Consequently, the use of triazine facilitates the formation of a 2D COF with an extended π-system. Likewise, small molecules and polymers containing fused (bi)­heterocyclic thiazolo­[5,4- d ]­thiazole moieties have drawn attention because of their co-facial geometry and rigid planar structure that help in high electron and hole mobility. − Thiazole moieties further feature excellent light harvesting ability, which is beneficial for photocatalysis. − The as-synthesized TTA-Tz COF is successfully utilized as a photocatalyst, which shows an excellent selectivity of >99% toward CO production with a maximum production rate of 82 μmol g –1 h –1 (yield: 2800 μmol g –1 ). Furthermore, to achieve the capture and storage of solar energy in the form of chemicals by mimicking the natural photosynthesis model, the catalytic activity is further studied under direct sunlight in aqueous medium where it generates 285 μmol g –1 of CO in 8 h. Interestingly, by changing the sacrificial electron donor from water to a mixture of BNAH (1,4-dihydronicotinamide) and TEA (triethyl amine), CH 4 and CO are obtained with selectivities of 23 and 77%, respectively.…”

Amide-functionalized covalent triazine framework for enhanced photocatalytic hydrogen evolution

“…Covalent organic frameworks (COFs), featuring outstanding chemical and physical stability, structural tunability, and low skeletal density, have emerged as one of the most promising organic porous materials for photoredox reactions, including water splitting [1][2][3][4], carbon dioxide reduction [5][6][7][8][9], and organic reactions [10][11][12][13]. Among these structures, covalent triazine frameworks (CTFs) with nitrogen-rich conjugated skeletons have demonstrated plausible potential in photocatalytic hydrogen production from water [14][15][16][17][18]. The structure-activity analysis suggests that CTFs with a highly crystalline and strong electron donor-acceptor structure commonly exhibit good photocatalytic activity [19,20].…”