M. Ota et al., PREPARATION AND MAGNETIC-PROPERTIES OF NOVEL TRIARYLMETHANE RESIN CONTAINING FERROCENE MOIETY, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 232, 1993, pp. 313-322
New triarylmethane resins were prepared by the condensation of pyrene
and azulene/ferrocene-carboxaldehyde (FCA), respectively. Contrary to
diamagnetic ferrocene and FCA, pyrene/FCA based resin gave weak magnet
ic properties. Paramagnetic behavior was observed for the azulene/FCA
based resin. These magnetic properties related with characteristics of
the raw aromatics.