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Recent synthetic studies on the organic molecules tetracene and pentacenehave found certain dimers and oligomers to exhibit an intense absorption in thevisible region of the spectrum which is not present in the monomer or manypreviously-studied dimers. In this article we combine experimental synthesiswith electronic structure theory and spectral computation to show that thisabsorption arises from an otherwise dark charge-transfer excitation 'borrowingintensity' from an intense UV excitation. Further, by characterizing the roleof relevant monomer molecular orbitals, we arrive at a design principle thatallows us to predict the presence or absence of an additional absorption basedon the bonding geometry of the dimer. We find this rule correctly explains thespectra of a wide range of acene derivatives and solves an unexplainedstructure-spectrum phenomenon first observed seventy years ago. These resultspave the way for the design of highly absorbent chromophores with applicationsranging from photovoltaics to liquid crystals.

Anticipating acene-based chromophore spectra with molecular orbital arguments