Triplet energies of pi-conjugated polymers.
Using pulse radiolysis and triplet energy transfer has enabled us to measure the triplet energies in a broad range of different pi-conjugated polymers. In all cases we find that the 1 (3)B(u) is of order 0.6 to 1 eV below the 1 (1)B(u), indicative of localized triplet states with strong electron-electron correlation. We also observe that the 1 (1)A(g)-1 (3)B(u) gap decreases linearly as the 1 (1)A(g)-1 (1)B(u) gap decreases even though polymers with very different structure have been studied. This surprising result suggests that polymers with singlet gap <1.3 eV will have a triplet ground state.
Monkman
A P
AP
Department of Physics, University of Durham, Durham, United Kingdom.
Burrows
H D
HD
Hartwell
L J
LJ
Horsburgh
L E
LE
Hamblett
I
I
Navaratnam
S
S