The formal [2 + 2] cycloaddition–cycloreversion (CA–CR) between 4-ethynyl-N,N-dimethylaniline and polyenic Donor–π-Acceptor (D–π-A) systems takes place to yield compounds bearing two donors and one acceptor. Structural, linear and second-order nonlinear optical (NLO) properties of the new molecules reveal the stronger polarization of these systems when compared to analogous merocyanines lacking the dimethylaminophenyl (DMA) ring.
Organic & Biomolecular Chemistry
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