Abstract:A series of rigid poly(p‐phenylene ethynylene)s (PPE1–PPE4) with biphenyl‐ (M1–M3) and phenyl‐ (M4) side groups is prepared from appropriately functionalized monomers. Herein, the solution and solid state absorption studies show the polymers have adopted twisted and rigid conformations, as supported by deep HOMO energy levels (−5.76 to −5.81 eV). The absorption maxima of PPE1 –PPE3 are shifted to shorter wavelength (λmax = 375–381 nm) as compared to linear poly(p‐phenylene ethynylene)s (446 nm), implying a nonp… Show more
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