New fluorophores with rod-shaped polycyano pi-conjugated structures: synthesis and photophysical properties.
[reaction: see text] Novel rod-shaped polycyano-oligo(phenyleneethynylene)s were synthesized by Pd cross-coupling reaction. Polycyano groups were found to greatly improve the emission efficiency (Phi(f)) of OPEs. By the end donor modification, we achieved the creation of very intense blue light-emitting fluorophore with the SMe group (Phi(f) = 0.972, log epsilon 4.89, lambda(em) 455 nm) and very intense yellow light-emitting fluorophore with the NMe(2) group (Phi(f) = 0.999, log epsilon 4.75, lambda(em) 555 nm). Contrasting Phi(f) solvent dependency of 6 and 7 and a linear relationship between Phi(f) and sigma(p)-X over the whole region of sigma(p)-X were also found.
Department of Chemistry, Kinki University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan. yamaguch@chem.kindai.ac.jp
Yoshihiro
Y
Yamaguchi
Takanori
T
Ochi
Tateaki
T
Wakamiya
Yoshio
Y
Matsubara
Zen-Ichi
Z
Yoshida