[reaction: see text]. Photochromic pyrans, including [3H]naphtho[2,1-b]pyrans, [2H]naphtho[1,2-b]pyrans, indeno-fused naphtho[1,2-b]pyrans, and heteroannulated pyrans, were synthesized in excellent yields through a facile one-pot procedure by reaction of propargyl alcohol and naphthol or phenol derivatives in the presence of 5 mol % PPTS and 2 equiv of (MeO)3CH. Symmetrical and nonsymmetrical bispyrans
Two Stage Colour Modulation of Triarylmethine Dyes Derived from a Photochromic Naphthopyran
作者:Christopher D. Gabbutt、B. Mark Heron、Suresh B. Kolla、Matthew Mcgivern
DOI:10.1002/ejoc.200800178
日期:2008.4
The synthesis of the unsymmetrical triarylmethine dyes 4derived from a lithiated naphthopyran and diaryl ketones is reported. In toluene solution 4 display a typical reversible photochromic response becoming coloured upon irradiation with UV light and fading upon cessation of irradiation. At low pH an intensely coloured dye cation is generated and UV irradiation of this solution results in a further
Photochromic bis-naphthopyran compounds and methods for their manufacture
申请人:——
公开号:US20030078441A1
公开(公告)日:2003-04-24
The invention provides photochromic bis-naphthopyran compounds as well as methods for their manufacture and their use. The bis-naphthopyran compounds of the invention exhibit a wide range of color, i.e., from pink to purple to blue gray, upon activation by a source of UV light. Additionally, the bis-naphthopyran compounds of the present invention exhibit broad coloration ability, fast response as to both color change on activation and return to original color, and good fatigue-resistance.
Photochromic systems with photoinduced emission modulation of colloidal CdSe quantum wells
作者:Valery A. Barachevsky、Olga V. Venidiktova、Tatyana M. Valova、Alexander M. Gorelik、Roman B. Vasiliev、Artur A. Khuzin、Airat R. Tuktarov、Pavel V. Karpach、Vitali I. Stsiapura、Gennady T. Vasilyuk、S. A. Maskevich
DOI:10.1039/c9pp00341j
日期:2019.11
A spectroscopic study of photochromic systems containing two-dimensional CdSe nanoparticles (colloidal quantum wells) and photochromic compounds of the thermally relaxing chromene and thermally irreversible diarylethene classes in solutions was carried out. First, the systems were found to exhibit modulation of emission of two-dimensional nanoparticles in accordance with the photochromic transformations of compounds due to Forster resonance energy transfer (FRET) from the two-dimensional nanoparticles to photoinduced photochromic isomers.
PHOTOCHROMIC BIS-NAPHTHOPYRAN COMPOUNDS AND METHODS FOR THEIR MANUFACTURE
申请人:ESSILOR INTERNATIONAL
(COMPAGNIE GENERALE D'OPTIQUE)