Weak intermolecular charge transfer in the ground state of a pi-conjugated polymer chain

We show that a pi-conjugated polymer chain can demonstrate weak intermolecular charge transfer in the electronic ground state. Poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene]/2,4,7-trinitrofluorenone (MEH-PPV/TNF) donor-acceptor films have been studied by optical absorption, Raman, infrared spectroscopy, and differential scanning calorimetry. The factors influencing weak intermolecular charge transfer in pi-conjugated chains are discussed. (C) 2005 Pleiades Publishing, Inc.