@article{7774f15aec4b4af5940608f00b453354,
title = "Expanded dipyrrins with electron-withdrawing substituents: Broad range of absorption in the visible region",
abstract = "Reaction of meso-aryl-substituted dipyrromethanes with tetracyanoethylene led to generation of a mono-tricyanovinyl-substituted species as well as an expanded dipyrrin analogue bearing both a dicyanomethylene and a tricyanovinyl substituent at the α-positions. These novel compounds exhibit absorption spectral features perturbed by the electron-withdrawing substituents. Unique protonation-induced spectral changes were also disclosed.",
author = "Xu Liang and Soji Shimizu and Nagao Kobayashi",
note = "Funding Information: This work was partly supported by the Grant-in-Aids for Scientific Research (B) (No. 23350095 ) and (C) (No. 23550040 ) from JSPS, and a Grant-in-Aid for Scientific Research on Innovative Areas (No. 25109502 , {"}Stimuli-responsive Chemical Species{"}) from MEXT. The authors thank Professor Takeaki Iwamoto and Dr. Shintaro Ishida, Tohoku University for the X-ray measurements. ",
year = "2014",
month = jan,
day = "1",
doi = "10.1016/j.tetlet.2013.11.013",
language = "English",
volume = "55",
pages = "256--258",
journal = "Tetrahedron Letters",
issn = "0040-4039",
publisher = "Elsevier Limited",
number = "1",
}