Synthesis, Characterization and Unusual Near-Infrared Luminescence of 1,1,4,4-Tetracyanobutadienes
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1,1,4,4-tetracyanobutadiene (TCBD) derivatives were prepared by [2+2]cycloaddition-retroelectrocyclization
from ynamides bearing either a pyrene (1) or a perylene unit (2). In addition
to panchromatic absorptions in 2, in the solid state, both compounds
unexpectedly display NIR photoluminescence that could be detected up to about