Controllable Synthesis of Porphyrin‐Based 2D Lanthanide Metal–Organic Frameworks with Thickness‐ and Metal‐Node‐Dependent Photocatalytic Performance

Abstract

Synthesizing 2D metal–organic frameworks (2D MOFs) in high yields and rational tailoring of the properties in a predictable manner for specific applications is extremely challenging. Now, a series of porphyrin‐based 2D lanthanide MOFs (Ln‐TCPP, Ln=Ce, Sm, Eu, Tb, Yb, TCPP=tetrakis(4‐carboxyphenyl) porphyrin) with different thickness were successfully prepared in a household microwave oven. The as‐prepared 2D Ln‐TCPP nanosheets showed thickness‐dependent photocatalytic performances towards photooxidation of 1,5‐dihydroxynaphthalene (1,5‐DHN) to synthesize juglone. Particularly, the Yb‐TCPP displayed outstanding photodynamic activity to generate O2− and 1O2. This work not only provides fundamental insights into structure designing and property tailoring of 2D MOFs nanosheets, but also pave a new way to improve the photocatalytic performance.

Efficient Curing Sacrificial Agent-Induced Dual-Heterojunction Photoelectrochemical System for Highly Sensitive Immunoassay

“…The negative slope of M–S plots for SWCNHs-MoS 2 is consistent with the behavior of a typical p-type semiconductor (Figure S3A), and the positive slopes for Ag 2 S and Ag 2 S/SWCNHs-MoS 2 materials are matched to the n-type (Figure S3B,C). The S-shape M–S plots may indicate the formation of a Schottky junction between SWCNHs and MoS 2 , and a peak appearing in Ag 2 S/SWCNHs-MoS 2 suggests that the p–n heterojunction probably existed. , When MoS 2 is generated in situ of SWCNHs, the original thin flocs of the SWCNHs become denser and thicker (Figure A,B). The polycrystalline images with different d-spacing lattice distribution are observed in HRTEM (inset of Figure B), indicating the growth of MoS 2 on SWCNHs through the Schottky junction structure.…”

Metal–Organic Layers for Electrocatalysis and Photocatalysis

“…First, as compared to MOFs, MOLs have fewer issues of light scattering, thanks to its ultrathin morphology and dispersibility in solvents. 115 Second, the accessibility of active centers on MOLs is critical in photocatalysis as the excited state has a limited lifetime (ns−μs for singlet excited state and μs-ms for triplet excited state) during which the contact with substrate must happen to escape futile energy dissipation. 38 , 39 Third, efficient energy transfer is critical for a range of photocatalysis, which will be detailed in the next section.…”

“… 37 , 40 , 41 , 116 We focus on designing these synergistic entities on MOLs to facilitate electron transfer between the two in this section. 36 − 41 , 60 , 65 , 115 − 123 …”

Tuning Atomically Dispersed Fe Sites in Metal–Organic Frameworks Boosts Peroxidase-Like Activity for Sensitive Biosensing

“…Metal–organic frameworks (MOFs) have received widespread applications in various fields because of their attractive features including large surface area, high porosity, structural diversity and functional tunability [ 23 – 26 ]. Significantly by virtue of the versatile organic linkers and atomically dispersed metal structural building units, the microstructure and the electronic structure of MOFs could be well regulated via various strategies [ 27 – 31 ]. In particular, the introduction of functional groups or heteroatoms in the MOFs can not only affect the electron density around the atomically dispersed metal centers but also change the nucleophilicity, redox potential and stability of the catalysts, making them own great potential in electrocatalysis, photocatalysis and biocatalysis [ 32 – 36 ].…”