Modulating the coordination microenvironment of uranyl compounds to enhance photocatalytic CO₂ reduction

Abstract

Rationalizing of the use of depleted uranium resources has always been of great interest. Herein, we have obtained two actinide compounds by regulating the ratio of each component in the...

Preparation of a Nanosheeted Uranyl–Organic Framework for Enhanced Photocatalytic Oxidation of Toluene

“…Two UO 8 hexagonal bipyramids are connected by edge-sharing to form a [(UO 2 ) 2 (μ 2 -O) 2 O 8 ] 4– binuclear uranyl unit (Figure a). In the two uranium centers, the lengths of the axial UO bond are in the range of 1.712–1.846 Å, and the lengths of the U–O bond in the equatorial plane are in the range from 2.320 to 2.535 Å, all of which are equal to the distances reported. − Binuclear uranyl units are linked by quadridentate ligands via each chelating four carboxyl groups, which further extends to build a monolayer with ring structures (Figure b). Finally, such layers are stacked by π···π interaction forming a three-dimensional supramolecular network structure with an interlayer spacing of about 3.3 Å (containing the van der Waals radii) (Figure c).…”

Molecular modification of planar four-coordinated cobalt active site for the electrochemical reduction of carbon dioxide: a density functional theory study

“…13–16 In particular, metal-coordinated N-doped carbon-supported SACs (M–N–C, M = transition metals) have emerged as promising CO 2 RR electrocatalysts, featuring long-term stability, reproducible performance, and potential for large-scale synthesis. 17–21 Prior to these catalysts, metallic tetraazamacrocycles, including porphyrins, phthalocyanines, and biphenanthrolinic hexaazacyclophanes, with similar M–N 4 coordination structures have attracted attention towards catalysis for the CO 2 RR in the 1970s. 22 As early as 1974, Meshitsuka first observed that graphite-supported cobalt or nickel phthalocyanine electrodes showed the polarization curves in aqueous electrolytes with CO 2 ; the reduction product, however, was not identified.…”