Synthesis and photophysical properties ofN-styrylazinones
摘要:
Abstractmagnified imageN‐Styrylazinones and 1‐styrylbenzotriazine were synthesized, and their photophysical properties were investigated. (Z)‐ and/or (E)‐N‐Styrylazinones (or azine) 4 were prepared from the corresponding heterocycles 1 and benzaldehyde (3) by four methods. The absorption maxima of (Z)‐ and/or (E)‐4a‐4j were measured in four solvents. Their absorption maxima showed a moderate dependence upon solvents. The absorption maxima of (Z)‐isomers were blue‐shifted as compared the corresponding (E)‐isomers. Emission maxima, fluorescence band half‐widths, 0,0 transition energies, Stokes shifts, and quantum yields of (Z)‐ and/or (E)‐4a, 4b, 4d, 4e and 4j were measured in organic solvents. The fluorescence spectra show moderate solvatochroism. The fluorescence properties of N‐styrylheterocycles vary with every heterocycles.
Stereoelectronic effects in the halogenation of N-alkylnaphthalimides
作者:Christopher J. Easton、Ilse M. Scharfbillig、Edward R.T. Tiekink
DOI:10.1016/s0040-4039(00)61161-9
日期:1992.9
The greater rate of bromination of N-methylnaphthalimide compared to N-ethylnaphthalimide, and the relative ease of chlorination of these compounds, provide convincing evidence of stereoelectronic effects in the free-radicalhalogenation of N-alkylimides.