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Kanth P, Shankar Rao D, Krishna Prasad S, Singh B. Investigation of mesomorphic, photophysical and gelation behavior in aroylhydrazone based liquid crystals: Observation of mesophase crossover phenomena. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Zhang W, Xu C, Kobayashi T, Zhong Y, Guo Z, Zhan H, Pruski M, Huang W. Hydrazone-Linked Heptazine Polymeric Carbon Nitrides for Synergistic Visible-Light-Driven Catalysis. Chemistry 2020; 26:7358-7364. [PMID: 32090400 DOI: 10.1002/chem.202000934] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Indexed: 01/07/2023]
Abstract
Heptazine-based conjugated polymeric carbon nitrides (PCNs) are promising metal-free photocatalysts, yet their synthesis is challenging due to the electron-deficiency and insolubility of heptazine units. Indeed, heptazine-containing polymers have only been prepared through nucleophilic substitution with amines by using toxic cyameluric chloride as the starting material. Herein, we report the novel and environmentally friendly method for preparing heptazine-based mesoporous PCNs with hydrazone links formed through a simple Schiff base condensation of melem-NH2 and aldehydes. Unlike cyameluric chloride, melem-NH2 is non-toxic, stable, and can be readily obtained from melem and hydrazine in solution. We demonstrate that the hydrazone linkages and the heptazine units synergistically enhance the photocatalytic activity of PCNs in visible-light-driven aerobic oxidation of benzyl alcohol to benzaldehyde. In particular, the polymer constructed from melem-NH2 and p-phthalaldehyde shows 17 times more activity than graphitic carbon nitride (g-C3 N4 ).
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Affiliation(s)
- Wei Zhang
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, P. R. China.,Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Congying Xu
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, P. R. China
| | | | - Yun Zhong
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, P. R. China
| | - Zhiyong Guo
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, P. R. China
| | - Hongbing Zhan
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, P. R. China
| | - Marek Pruski
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,Ames Laboratory, US Department of Energy, Ames, IA, 50011, USA
| | - Wenyu Huang
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,Ames Laboratory, US Department of Energy, Ames, IA, 50011, USA
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Effect of the linkages on the self-assembly and photophysical properties of 4,7-diphenyl-2,1,3-benzothiadiazole-based luminescent polycatenars. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.04.121] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Singh HK, Gupta RK, Singh SK, Rao DS, Prasad SK, Achalkumar AS, Singh B. Synthesis and self-assembly of aroylhydrazone based polycatenars: A structure-property correlation. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.04.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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