Spiro[2H]-1-Benzopyran-2,9′-Fluorenes: Hyperchromic and Bathochromic Shifts of the Visible Absorption of Chromenes
- 1 May 1997
- journal article
- research article
- Published by Taylor & Francis Ltd in Molecular Crystals and Liquid Crystals
- Vol. 297 (1), 255-262
- https://doi.org/10.1080/10587259708036130
Abstract
The synthesis of spiro[fluorene-naphthopyrans] and spiro[fluorene-furano [3,2-flchromenes] allowed us to quantify the role of fluorene moiety towards photochromic properties. Compared to corresponding diphenylchromenes, the extended II system delocalization causes a bathochromic shift of the visible absorption of the colored merocyanines. Whatever the right hand side in the studied series, an hyperchromic effect is observed.Keywords
This publication has 6 references indexed in Scilit:
- Photochromism of DiarylnaphthopyransMolecular Crystals and Liquid Crystals, 1994
- Red Colouring Photochromic 6′-Substituted Spiroindolinon Aphth[2,1-b][1,4]OxazinesMolecular Crystals and Liquid Crystals, 1994
- Effets de substituant, d'hétéroatome et de solvant sur les cinétiques de décoloration thermique et les spectres d'absorption de photomérocyanines en série spiro[indoline‐oxazine]Helvetica Chimica Acta, 1990
- Pyrans and Fused Pyrans: (iii) Synthesis and ApplicationsPublished by Elsevier BV ,1984
- Photochromism of Synthetic and Naturally Occurring 2H-Chromenes and 2H-PyransJournal of the American Chemical Society, 1966
- Studies on Acetylenic Compounds. XXXII. Ring Closure of Propargyl Ethers. (2).CHEMICAL & PHARMACEUTICAL BULLETIN, 1963