%0 Journal Article
%A López Duarte, Ismael
%A Reeve, James E.
%A Pérez-Moreno, Javier
%A Boczarow, Igor
%A Depotter, Griet
%A Fleischhauer, Jan
%A Clays, Koen
%A Anderson, Harry L.
%T “Push-no-pull” porphyrins for second harmonic generation imaging
%D 2013
%@ 2041-6520
%@ 2041-6539
%U https://hdl.handle.net/20.500.14352/114860
%X The established approach to design a molecule with strong second-order nonlinear optical (NLO) activity is to connect an electron-donor to an electron-acceptor via a pi-conjugated bridge, to generate push-pull system. Surprisingly, we have found that dyes with large first hyperpolarizabilities, and which exhibit strong second harmonic generation (SHG), can be created just by attaching an electron-donor to a porphyrin. The free-base porphyrin core is sufficiently electron-deficient that the hyperpolarizability does not increase on addition of a pyridinium electron-acceptor.
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