By contrast, the two chiral POPs PRBT and PSBT displayed distinguished yellow green emission at 522 nm as a suspension in MeOH and orange emission at 565 nm as powder (Figure and), whereas the red-shifted emission was attributed to the extended π-conjugation in the 3D porous scaffold . And the absolute φ F for PRBT and PSBT were measured to be 18.4% and 17.1% as suspension in MeOH, and 9.2% and 6.4% as powder, respectively (Figure ). This was obviously lower than that of the chiral macrocycles in both states. The attenuated emission efficiency for luminescent POPs was probably owing to the free rotation of phenyl rings in the 3D porous shape-persistent scaffold.