. To reduce the conformational disorder in the backbone of PDI-V, a larger, shapepersistent PDI-based monomer naphthodiperylenetetraimide(NDP) was designed by Zhao et al. through covalently fusing halfof the vinylene linkers in PDI-V backbone to the bay region ofadjacent PDI units on both sides, featuring a poly(NDPvinylene) backbone [71].