Fig. 1.

The structure composition of photocatalysts. (A) Crystal structures and simplified balls of oxidative PMo₁₂ cluster and reductive Ni₅ cluster. The red arrows represent the directional photoelectron transfer between clusters. The cyan curves represent the nondirectional charge transfer between two clusters. (B–D) Crystal structures determined by SCXRD analysis, simplified structures, and packing diagrams of d-OR-, a-OR-, and s-OR-type photocatalysts. The simplified diagram in the Middle shows possible charge transfer between PMo₁₂ (O) and Ni₅ (R) clusters. All hydrogen atoms are omitted for clarity.