Visible light absorption is also an important aspect of photocatalysis, and the three materials do show different absorption onsets in the solid state. These were determined to be 504, 477 and 449 nm for TBAP-α, TPyP-α and TPhP-α, respectively. However, based on experience with other materials, we would not expect this degree of blueshift to give the large, order-ofmagnitude, change in photocatalytic activity between TBAP-α and the other two materials.