Two Cu() coordination polymers based on a new benzimidazolyl-tetrazolyl heterotopic ligand for visible-light-driven photocatalytic dye degradation

Two Cu( i ) coordination polymers (CPs), namely, [Cu I (DBPT)(H 2 O)] n (HDBPT = 3,5-di((1 H -benzeimidazol-yl)phenyl)-2 H -tetrazole, CP 1 ) and [Cu I (DBPT)·DMF] n (CP 2 ), were constructed based on a new N-containing heterotopic triangular ligand. CP 1 is a 2D network consisting of binuclear seco...

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Published in:CrystEngComm 2023-01, Vol.25 (3), p.417-424
Main Authors: Tang, Ping, Xie, Xue-Xian, Huang, Zi-Yuan, Kuang, Zhi-Yang, Cai, Song-Liang, Zhang, Wei-Guang, Zheng, Sheng-Run
Format: Article
Language:English
Subjects:
Bonding strength
Coordination polymers
Energy bands
Energy gap
Hydrogen bonds
Hydrogen peroxide
Ligands
Light irradiation
Oxidizing agents
Photocatalysis
Photodegradation
Redox reactions
Supramolecular frameworks
Tetrazoles
Topology
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Summary:Two Cu( i ) coordination polymers (CPs), namely, [Cu I (DBPT)(H 2 O)] n (HDBPT = 3,5-di((1 H -benzeimidazol-yl)phenyl)-2 H -tetrazole, CP 1 ) and [Cu I (DBPT)·DMF] n (CP 2 ), were constructed based on a new N-containing heterotopic triangular ligand. CP 1 is a 2D network consisting of binuclear secondary building units (SBUs). The 2D layers are connected by strong hydrogen bonds to form a 3D supramolecular framework. CP 2 possesses a 3D framework based on binuclear SBUs and features a (3,6)-connected rtl topology. Both CP 1 and CP 2 have high stability in water in the pH range from 3-13 and exhibit energy band gaps of 2.70 and 2.79 eV, respectively, which indicate their possibility in visible-light-driven photocatalysis. The photocatalytic results show that both CP 1 and CP 2 display good activity for MLB degradation in the presence of H 2 O 2 as an oxidant under visible light irradiation. A mechanistic investigation indicated that the photogenerated holes trapped by Cu( i ) generate Cu( ii ). Cu( ii ) may be involved in a Fenton-like CuI/CuII redox reaction to generate &z.rad;OH. Thus, holes and &z.rad;OH contribute to the degradation of MLB. In addition, the degradation product of MLB was further studied by LC-MS, which indicates that MLB is almost degraded to small molecules. Two Cu( i ) CPs based on a new heterotopic tripodal ligand were constructed and their visible-light-driven photocatalytic performance were studied.
ISSN:1466-8033
1466-8033
DOI:10.1039/d2ce01497a