EPR spectroscopy of polydiphenyldiacetylene derivatives

Stationary and pulsed EPR spectroscopy techniques were used in a derailed s tudy of new polyconjugated polymers (PCP) based on polydiphenyldiacetylene to reveal the special features of localization of unpaired electrons in PCP s of various structures. PCPs modified by chromium and tungsten carbonyls w ere synthesized for the first time. The width of the line of echo-detected EPR spectra, unlike that of stationary EPR spectra, was independent of O-2 pressure. An explanation of this observation is suggested. Interrelations b etween the widths of EPR lines and the particular features of the localizat ion and microenvironment of unpaired electrons in PCP molecules are discuss ed.