Strong two-photon absorption enhancement in a unique bis-porphyrin bearing a diketopyrrolopyrrole unit.
A π-extended bis-porphyrin bridged via a diketopyrrolopyrrole unit was prepared in 5 steps. This fully conjugated π-system displays strongly distorted linear absorption, while its two-photon absorption cross-section reaches 2500-3000 GM at 940 nm. LC-like behaviour, easy orientation and low viscosity are, according to XRD, POM and DSC measurements, due to formation of plastic rather than a liquid crystal.
Institute of Organic Chemistry of the Polish Academy of Sciences, 01-224 Warsaw, Poland. dtgryko@icho.edu.pl.
Agnieszka
A
Nowak-Król
Marek
M
Grzybowski
Jerzy
J
Romiszewski
Mikhail
M
Drobizhev
Geoffrey
G
Wicks
Maciej
M
Chotkowski
Aleksander
A
Rebane
Ewa
E
Górecka
Daniel T
DT
Gryko