Scanning electron microscopy imaging also indicated the inaccessibility of the TBAP-α pores: even the small, photodeposited Pt particles appeared to reside on the crystal surface, rather than within the pore channels (SI, Figure ). At present, it is not possible to state the precise role that micropores in TBAP-α play in the photocatalytic process, although the location of the Pt cocatalyst instead suggests that the external crystal surface is very important. It is conceivable that hole scavenging can occur within the pore channels, even if the main sites for photocatalytic hydrogen production are on the crystal surface; if so, then charge transport of the holes and electrons in the material would be important, which might explain the benefit of the extended -stacks in TBAP-α.