Abstract
Incorporating a poly( p-phenylene) (PPP) backbone into a planar ladder polymer yields a molecular system with well-defined configuration and conformation. This chemical modification influences the electronic properties of PPP. We discuss the absorption spectra in the ultraviolet (UV) and visible range comparing the PPP-type ladder polymer (LPPP) to PPP and poly( p-phenylene vinylene) (PPV). The photoinduced absorption (PIA) data are compared with the net change of the optical absorption upon solution doping with FeCl 3. The spectral dependence of the PIA in the near infrared region (NIR), as well as the behaviour with respect to time and pumplight-intensity are evaluated. These results show that the optical properties of the LPPP are much closer to PPV than PPP.
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