π-Expanded 1,3-diketones – synthesis, optical properties and application in two-photon polymerization

摘要: Four π-expanded α,β-unsaturated 1,3-diketones have been prepared via attaching strong electron-donating and electron-withdrawing groups at positions 9 10 of the anthracene scaffold. The strategic incorporation (C12H25)2N periphery these D–π–A molecules resulted in dyes with excellent solubility most organic solvents. These non-planar diketones possess very broad absorption light negligible fluorescence. two-photon cross-section was measured Z-scan as well by excited results clearly confirm that, case compounds possessing such small fluorescence quantum yields, a more reliable approach. Depending on chemical structure, exhibited cross-sections (σ2) up to 2500 GM 725 nm. For first time an ketone derived from proton sponge has synthesized shown optical features distinct its simpler analogs, weak emission. All studied ketones possessed ∼200 wavelength polymerization (i.e. 800 nm) fabrication windows achieved using all photoinitiators.