Ni and Zn show a winning combination of redox potential and band positions of TiO ₂ supported metal-oxo-nanoclusters for enhanced solar-light activity. However, Ni is the only metal which has a positive effect on solar photoactivity in both oxidation and reduction reactions.

A HKUST-1 metal–organic framework was crystallized in the NH₂-modified mesostructured silica FDU-12 in order to improve its structural stability upon water exposure.

Efficient CO₂ capture at concentrations between 400–2000 ppm is essential for maintaining air quality in a habitable environment and advancing carbon capture technologies. This study introduces NICS‐24 (National Institute of Chemistry Structures No. 24), a Zn‐oxalate 3,5‐diamino‐1,2,4‐triazolate framework with two distinct square‐shaped channels, designed to enhance CO₂ capture at indoor‐relevant concentrations. NICS‐24 exhibits a CO₂ uptake of 0.7 mmol/g at 2 mbar and 25 °C, significantly outperforming the compositionally related Zn‐oxalate 1,2,4‐triazolate – CALF‐20 (0.17 mmol/g). Improved performance is attributed to amino‐functions that enhance CO₂ binding and enable superior selectivity over N₂ and O₂, achieving 8‐fold and 30‐fold improvements, respectively, in simulated CO₂/N₂ and CO₂/O₂ atmospheric ratios. In humid environments, NICS‐24 retained structural integrity but exhibited an 85 % reduction in CO₂ capacity due to competitive water adsorption. Breakthrough sorption experiments, atomistic NMR analysis, and DFT calculations revealed that water preferentially adsorbs over CO₂ due to strong hydrogen‐bonding interactions within the framework. Gained understanding of the interaction between CO₂ and H₂O within the MOF framework could guide the modification via rational design with improved performance under real‐world conditions.