title: Cycloaddition reactions of polyenic donor-π-acceptor systems with an electron-rich alkyne: access to new chromophores with second-order optical nonlinearities.
abstract: 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.
authors.affiliation: Departamento de Química Orgánica, ICMA, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain.
authors.forename: Elena
authors.initials: E
authors.lastname: Galán
authors.forename: Raquel
authors.initials: R
authors.lastname: Andreu
authors.forename: Javier
authors.initials: J
authors.lastname: Garín
authors.forename: Jesús
authors.initials: J
authors.lastname: Orduna
authors.forename: Belén
authors.initials: B
authors.lastname: Villacampa
authors.forename: Beatriz E
authors.initials: BE
authors.lastname: Diosdado
mesh_terms: D000480:Alkynes / Q000737:chemistry*; D003500:Cyclization; D004583:Electrons; D008958:Models, Molecular; D015394:Molecular Structure; D011090:Polyenes / Q000737:chemistry*
chemical_list: D000480:Alkynes; D011090:Polyenes