a) Schematic of polyacene synthesis using the MOF. b) Solid-state ¹³C NMR spectra of BBMN, BBMA, PNTD, PATD, and polyacene. The asterisk (*) corresponds to spinning side bands. c) FT-IR spectra of tetracene, pentacene, hexacene, heptacene, and polyacene synthesized using the MOFs (left). The relative peak area of SOLO and QUATRO vibration modes (A_SOLO:A_QUATRO) plotted against the number of benzene rings for the acene series (right) (black, tetracene; purple, pentacene; sky blue, hexacene; green, heptacene; blue, polyacene from PNTD; red, polyacene from PATD). The mean number of benzene rings in polyacene was calculated using the correlation between A_SOLO:A_QUATRO and the number of benzene rings (dotted line). Reprinted with permission from Kitao et al.⁴⁶ Copyright 2023 Macmillan Publishers Ltd.