Two Bulky Conjugated 4′‐(4‐Hydroxyphenyl)‐4,2′:6′,4′′‐terpyridine‐based Layered Complexes: Synthesis, Structure, and Photocatalytic Hydrogen Evolution Activity

Abstract

Two new layered complexes with the formulas of {[Cu(H 2 O)(HL) 2 Cl](NO 3 )} n (1) and {[Cu(H 2 O) 2 (HL) 2 ](NO 3 ) 2 } n (2) were solvothermally synthesized by the reactions of the bulky conjugated 4Ј-(4-hydroxyphenyl)-4,2Ј:6Ј,4ЈЈ-terpyridine ligand (HL) with different Cu II salts, which were further used as photocatalysts to achieve hydrogen production from water splitting. Single-crystal structural analyses reveal that both complexes feature coplanar (4 4) layers

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

“…[ 26 ] On the other hand, the hydrogen production of 1 is lower than the layered Cu II ‐based CPs with 4'‐(4‐hydroxyphenyl)‐4,2':6',4''‐terpyridine ligand (2.43 and 0.53 mmol · g –1 · h –1 ) probably due to the unfavorable redox potential (–0.8 V vs. –1.1 to –0.8 V) and the absence of the d–d transition. [ 23 ]…”

“…Moreover, it is found that the E g of 1 is narrower than two Cu II ‐based layered complexes with 4'‐(4‐hydroxyphenyl)‐4,2':6',4''‐terpyridine ligand (2.3 and 2.4 eV), suggesting the significance of the ligand‐field effect on optical bandgap. [ 23 ]…”

“…Moreover, it is found that the E g of 1 is narrower than two Cu II -based layered complexes with 4Ј-(4-hydroxyphenyl)-4,2Ј:6Ј,4ЈЈ-terpyridine ligand (2.3 and 2.4 eV), suggesting the significance of the ligand-field effect on optical bandgap. [23] The flat potentials of 1-3 are further acquired by the Mott-Schottky measurements in aqueous solution. As shown in Figure 4, the positive slopes of the obtained C -2 to the potential plot indicate these three complexes are typical n-type semiconductors.…”

“…[26] On the other hand, the hydrogen production of 1 is lower than the layered Cu II -based CPs with 4Ј-(4-hydroxyphenyl)-4,2Ј:6Ј,4ЈЈ-terpyridine ligand (2.43 and 0.53 mmol•g -1 •h -1 ) probably due to the unfavorable redox potential (-0.8 V vs. -1.1 to -0.8 V) and the absence of the d-d transition. [23] The stability and durability of the three photocatalysts were further checked by the PXRD characterizations and recycling experiments. After the 5-hour catalytic reaction, the CP photocatalysts were collected by filter, and washed with water twice and dried for PXRD measurement.…”

Nanosized Functional MOFs Loading Ag/AgBr with Throughout‐Visible‐Light Absorption for High‐Efficiency Photocatalysis

“…Semiconductor‐based photodegradation is considered to be the most promising strategy for eliminating water pollution due to its cleanliness and sustainable use of low cost . In photolysis applications, various homogeneous and heterogeneous photocatalysts have been widely used . In contrast to other most inorganic semiconductor catalysts, metal‐organic frameworks (MOFs), also called porous coordination) have tunable porous structures, structure design and functional modification of ligand, which have been used in various fields such as magnetic materials, gas adsorption and separation, heterogeneous catalysis, etc .…”