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Inside Cover: Nonplanar Butterfly‐Shaped π‐Expanded Pyrrolopyrroles (Chem. Eur. J. 46/2016)
Author(s) -
Krzeszewski Maciej,
Kodama Takuya,
Espinoza Eli M.,
Vullev Valentine I.,
Kubo Takashi,
Gryko Daniel T.
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201604245
Subject(s) - pyrrole , cover (algebra) , excited state , enantiomer , symmetry (geometry) , physics , crystallography , chemistry , stereochemistry , geometry , quantum mechanics , mathematics , organic chemistry , mechanical engineering , engineering
Heterocyclic nanographenes come in different sizes and shapes. Gryko, Kubo, Vullev and co‐workers have discovered that π‐expansion of pyrrole[3,2‐ b ]pyrroles leads to double helical heterocycles, the shape of which reminds of butterflies. The energy barrier between the folded meso form and two enantiomers in the twisted form is low, which allows co‐existence of “natural‐shaped” and “non‐natural” butterflies. These centrosymmetric compounds are solvatofluorochromic, which points to symmetry breaking in the excited state. More information can be found in the Full Paper by V. I. Vullev, T. Kubo, D. T. Gryko et al. on page 16478 ff.