Resonance Raman spectra of transient species of 1 ',3',3'-trimethylspiro-[2H-l-benzopyran-2,2'-indoline] in various solvents reveal that at least four transients having merocyanine-like structures are involved in the photochromism of this compound. It is concluded that the transient species in aliph
✦ LIBER ✦
Effect of substituents in the 5 and 8′ positions on the rate of dark decolorization of photocolored solutions of 1,3,3-trimethylspiro[Indoline-2, 2′-[2H-1]benzopyrans]
✍ Scribed by V. I. Pantsyrnyi; M. A. Gal'bershtam; N. A. Donskaya
- Book ID
- 112331533
- Publisher
- Springer US
- Year
- 1973
- Tongue
- English
- Weight
- 423 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0009-3122
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## Abstract The proton NMR assignments for a series of 12 thermo‐ and photochromic 1,3,3‐trimethylspiro(indoline‐2,2′‐benzopyrans) dyes is reported. All of the protons in the dye molecule were assigned through a combination of homonuclear decoupling experiments and correlation spectroscopy. The rel