Royal Society of Chemistry, Organic and Biomolecular Chemistry, 6(14), p. 2025-2033, 2016
DOI: 10.1039/c5ob02583d
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A donor–acceptor type π-expanded diketopyrrolopyrrole behaves as non-centrosymmetric as far as linear optical properties are concerned but as ‘pseudo-symmetric’ for two-photon absorption.