Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1409544 | Journal of Molecular Structure | 2012 | 8 Pages |
Six methylidene-pyrrolinones with a conjugation chain extended by vinylene and phenylene-vinylene groups were studied; five of them were synthesized for the first time. Their structures were estimated theoretically by density functional theory (DFT) and proved by X-ray diffraction techniques in two cases. Structural changes upon Z/E photoisomerization in solution were studied by a combination of 1H NMR spectroscopy and DFT GIAO method. Both types of conjugation extension caused a bathochromic shift in absorption. Vinylene extension produced the compounds fluorescent in solution. N-methylated derivatives have shown solid-state fluorescence.
► Methylidene-pyrrolinones with extended conjugation chains were synthesized. ► Structures were estimated by X-ray diffraction. ► Structural changes upon Z/E photoisomerization were studied by NMR and DFT. ► N-methylated derivatives show solid-state fluorescence.