▎ 摘　　要

NOVELTY - Oligophenylene monomer (I) is new. USE - The oligophenylene monomer is useful in polymeric precursor for preparing graphene nanoribbons. The graphene nanoribbons are useful in thin film semiconductor of electronic, optical, or optoelectronic device (where the device is organic field effect transistor device, an organic photovoltaic device, or organic light-emitting diode) (all claimed), manufacturing articles including electronic devices, optical devices, and optoelectronic devices, photovoltaics, organic LEDs, complementary metal oxide semiconductors complementary inverters, rectifiers, and ring oscillators and to fabricate various types of organic field effect transistors including top-gate top-contact capacitor structures, top-gate bottom-contact capacitor structures, bottom-gate top- contact capacitor structures, and bottom-gate bottom-contact capacitor structures. ADVANTAGE - The oligophenylene monomer provides graphene nanoribbon that exhibits broad optical absorption and/or very positively shifted reduction potential. DETAILED DESCRIPTION - Oligophenylene monomer of formula (I) is new. R1 = H, halo, -OH, -NH2, -CN, -NO2, or linear or branched, optionally saturated 1-40C hydrocarbyl which is optionally substituted 1-5- fold with halo, -OH, -NH2, -CN and/or -NO2, and where at least one CH2- is optionally replaced by -O-, -S-, -C(O)O-, -O-C(O)-, -C(O)-, -NH- or -NR3-; R3 = optionally substituted 1-40C hydrocarbyl, or optionally substituted aryl, alkylaryl, alkoxyaryl, alkanoyl or aroyl; either R2a, R2b = H; or at least one pair pf of adjacent R2aR2b = single bond in a six-membered carbocyclyl; m = 0-3; n = 0 or 1; and X = halo or trifluoromethanesulfonate; and Y1 = H; or X = H; and Y1 = halo or trifluoromethanesulfonate. INDEPENDENT CLAIMS are also included for: (1) a polymeric precursor for preparing graphene nanoribbons obtained from oligophenylene monomers; and (2) graphene nanoribbons, obtained by cyclodehydrogenation of polymeric precursors.