A cryptand-like Ti-coordination compound with visible-light photocatalytic activity in CO storage

A cryptand-like Ti-coordination compound, namely Ti 12 Cs , comprising two Ti 6 -salicylate cages and hosting two Cs + ions, was synthesized by the solvothermal method. It exhibits strong visible-light absorption with an absorption band edge of 652 nm, attributed to the electron transition from salicylate ligands to Ti ions. Electrochemical impedance, visible-light transient photocurrent response, and photoluminescence spectra confirm that Ti 12 Cs has excellent visible-light response and charge-separation properties. Ti 12 Cs can be used as a heterogeneous and recyclable photocatalyst for CO 2 /epoxide cycloaddition, with high utilization efficiency of visible-light under mild conditions. The mechanism investigation points to a synergistic effect of photocatalysis and Lewis acid catalysis. A cryptand-like Ti-coordination compound is reported, which hosts two Cs + and exhibits high performance in photocatalytic CO 2 /epoxide cycloaddition under visible-light irradiation.