A carboxylate-driven assembly strategy has been developed for the first time to build calix[n]arene-based polyoxotitanate clusters with tuneable nuclearity and structures. Photocatalytic studies revealed that these clusters exhibit structural-dependent H2 evolution ability with a maximum rate up to 415.11 μmol h−1 g−1, which is almost the highest recorded in polyoxotitanate clusters.
![Graphical abstract: Monocarboxylate-driven structural growth in Calix[n]arene-polyoxotitanate hybrid systems: utility in hydrogen production from water](http://hg.y866.cn/compound/lib/scimg/usr/1/D0CC05336H.jpg)
