While some interesting results have been achieved in photocatalysis, typically by adding electron acceptor (p-doping) or electron donor atoms or moieties (n-doping) in the final composition of the material, the correlation of material's structure with the observed catalytic performance remains phenomenological, as the observed changes in electronic properties, geometry and morphology seemed too intertwined to rationalize the changes in catalytic activity. One frontier in preparing photoactive multifunctional materials by modular design thus lies in the control and comprehension from the material's molecular structure up to the macroscopic scale, understanding material's performances in its entirety, beyond the description of its molecular units. To address these challenges, a regular, alternating assembly between building blocks containing different functional groups is a route to yield a periodic, sequential copolymer with a uniform integration of the dopant.