Designed Cluster Assembly of Multidimensional Titanium Coordination Polymers: Syntheses, Crystal Structure and Properties

The exploitation of new titanium-based coordination polymers (Ti CPs) with high crystallinity is difficult but highly desirable for their potential applications in photocatalysis. Herein, a cluster-cooperative assemble strategy is developed to synthesize Ti CPs. By utilizing various bifunctional ligands containing carboxylate acids and N-donor groups, we successfully assembled the zero-dimensional (0D) [(Ti3O)(iPrO)(8)](2+) or [(Ti4O2)(iPrO)(6)](6+) clusters into one-dimensional (1D) tube-, ribbon-, or helical chain-shape architec-tures, two-dimensional (2D) layered structures, and a rare parallel 2D -> three-dimensional (3D) polycatenation framework with various copper iodide dopants, including rhombus-or wing-shaped Cu2I2 and tetrahedron-or laddershaped Cu4I4. The as-synthesized compounds display strong absorption in the visible region with narrow band gaps ranging from 1.70 to 2.72 eV and exhibit good photocatalytic activities in the degradation of organic pollutants.