Beilstein J. Org. Chem.2017,13, 2374–2384, doi:10.3762/bjoc.13.235
generation. The experimental data were completed by quantum-chemical calculations and structure–property relationships were elucidated.
Keywords: calculations; diketopyrrolopyrrole; electrochemistry; electronic spectra; push–pull; third-harmonicgeneration; Introduction
Known for more than 40 years
absorption cross-section (δ2PA) generally ranging from 100–2500 GM, but for instance DPPs end-capped with imidazolium [21] or dendritic thiophenes [16] showed δ2PA of 4000 and 7000 GM, respectively. However, to the best of our knowledge, the third-harmonicgeneration (THG) NLO process has not been
).
Nonlinear optical properties
The thirdharmonicgeneration (THG) measurements of target chromophores 1–5 were carried out by using a 1064 nm Nd:YAG source beam. Due to the relatively high absorption of chromophores 1–5 around 355 nm, the observation of the THG was possible only in the reflected light
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Graphical Abstract
Figure 1:
General structure of investigated DPP derivatives 1–5.
Beilstein J. Org. Chem.2012,8, 25–49, doi:10.3762/bjoc.8.4
(benzimidazolyl)pyrazines 70 (Figure 13; [75][77]) represent further examples of interesting polymers functionalized with benzimidazole-based CT chromophores. Unfortunately, no NLO properties were investigated. In 2002, Kudryavtsev et al. reported third-harmonicgeneration in copolymer films (polyamides
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Graphical Abstract
Figure 1:
Schematic representation of organic D-π-A system featuring ICT.