Abstract
Quinoidalization results in amazingly intense near-IR absorption in 1 (λ(max) = 1080 nm), whereas the shorter dimer 2 (λ(max) = 780 nm) is less conjugated because steric interactions force it into a contorted geometry. The crystal structure of 1 shows that the 62-atom chromophore is bow-shaped in the solid state.
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APA
Blake, I. M., Rees, L. H., Claridge, T. D. W., & Anderson, H. L. (2000). Synthesis and crystal structure of a cumulenic quinoidal porphyrin dimer with strong electronic absorption in the infrared. Angewandte Chemie - International Edition, 39(10), 1818–1821. https://doi.org/10.1002/(SICI)1521-3773(20000515)39:10<1818::AID-ANIE1818>3.0.CO;2-E
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