Ladder structures that are composed exclusively of aromatic carbon centers have been the focus of theoretical calculations and diverse synthetic efforts for a long time.Polyacenes are a major interest in this area [ 11. Polyacenes are band molecules composed exclusively of annelated six-membered aromatic rings. Linear polyacenespoly[n]acenes -are, as polymers with low band-gap energy, poorly accessible as a result of their high reactivity (oxidation, dimerization) [2]. Hitherto only oligo[n]acenes up to hexa-and heptacene [3, 41 are known and characterized. Angular polyacenes are characterized, in comparison to poly[n]acene, by an enlarged energy gap (band gap), resulting from the diverse topology of the x-electron systems [5]. The extension of the longest linear [n]-acene segment in the angular band polymer is decisive for the specific value of the band-gap energy.A simple two-step synthesis for such an all-carbon ribbon was published recently [6]. The synthetic route represents a "classical" ladder polymer synthesis: a suitably substituted, open-chain precursor polymer is cyclized to a band structure in polymer-analogous fashion (Scheme 1). The
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