1206964-04-6Relevant articles and documents
Oligothiophenes nano-organized on a cyclotetrasiloxane scaffold as a model of a silica-bound monolayer: Evidence for intramolecular excimer formation
Mroz, Wojciech,Bombenger, Jean Philippe,Botta, Chiara,Biroli, Alessio Orbelli,Pizzotti, Maddalena,De Angelis, Filippo,Belpassi, Leonardo,Tubino, Riccardo,Meinardi, Francesco
, p. 12791 - 12798 (2009)
Excimer formation in a new class of terthiophene-based fluorophores covalently bonded to a cyclotetrasiloxane scaffold has been demonstrated and the photophysical process ruling it has been investigated in detail and modeled theoretically. In contrast to
A ‘donor-free’ chromophore with a silicon-based acceptor group for second order nonlinear optics
Di Carlo, G.,Fantucci, P.,Forni, A.,Orbelli Biroli, A.,Pizzotti, M.,Righetto, S.,Tessore, F.
, (2022/01/13)
In this paper we report an investigation on the linear and nonlinear properties of a non-classic push-pull molecule, based on the molecular design concept of a ‘donor-free’ chromophore. Herein a terthiophene unit acts both as a donor and a π-spacer group and a tris(trimethylsiloxy)silane substituent as an acceptor group. This latter can represent a model of a fragment of silica surface and it has been compared with a classic acceptor unit like the nitro group. The ‘donor-free’ chromophores have also been compared to more typical push-pull chromophores by replacing the terthiophene unit with the N,N-dimethylamino donor group. Despite the silane group only slightly impacts on the electronic and linear properties of the terthiophene, our results reveal high μβEFISH values for silane-functionalized derivatives producing a NLO activity stronger than that of the nitro substituted. Finally, the investigated ‘donor-free’ NLO-phore exhibits interesting physical properties relevant in term of nonlinearity/transparency trade-off, a highly desired requirement for second-order NLO materials.
