A Polypyridyl‐Based Layered Complex as Dual‐Functional Co‐catalyst for Photo‐Driven Organic Dyes Degradation and Water Splitting

Abstract

With the ever-increasing concerns on environmental pollution and energy crisis, it is of great urgency to develop high-performance photocatalyst to eliminate organic pollutants from wastewater and produce hydrogen via water splitting. Herein, a polypyridyl-based mixed covalent Cu I/II complex with triangular {Cu 3 } and rhombic {Cu 2 Cl 4 } subunits alternately extended by mixed SCNand Clheterobridges [Cu 4 (DNP)(SCN)Cl 4 ] n (1) [DNP = 2,6-bis(1,8-naphthyridine-2-yl)pyridine] was solvothermally synthesized and employed as a dual-functional co-photocatalyst. Resulting from a narrowed band-gap 623 of 1.07 eV with suitable redox potential and unsaturated Cu I/II sites, the complex together with H 2 O 2 can effectively degrade Rhodamine B and methyl orange up to 87.4 and 88.2 %, respectively. Meanwhile, the complex mixed with H 2 PtCl 6 can also accelerate the photocatalytic water splitting in the absence of a photosensitizer with the hydrogen production rate of 27.5 μmol·g -1 ·h -1 . These interesting findings may provide informative hints for the design of the multiple responsive photocatalysts.

Transition Metal Ion‐Directed Coordination Polymers with Mixed Ligands: Synthesis, Structure, and Photocatalytic Activity for Hydrogen Production and Rhodamine B Degradation

“…The characteristic peaks at 934.2 and 954.0 eV are assigned to the 2p 3/2 and 2p 1/2 , indicating the presence of Cu I , other two binding energies at 943.4 and 962.5 eV can be ascribed to 2p 3/2 and 2p 1/2 of the Cu II atom (Figure S3, Supporting Information). [ 20 ] Acting as a 3‐connected node, the tpt ligand is neutral, offering three exterior pyridyl moieties to interact with metal ions. By contrast, both unique H 4 L ligands are fully deprotonated and centrosymmetric, adopting a μ 4 ‐ k 6 O1:O2,O3:O1':O2',O3' and μ 4 ‐ k 6 O1,O2:O2, O3:O1', O2':O2', O3'‐modes through two pairs of sulfonate and carboxylate groups (Figure S1, Supporting Information).…”