کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
176516 | 458945 | 2012 | 4 صفحه PDF | دانلود رایگان |

A novel photochromic 2,3-dithiazolylindole has been synthesized and its photochromic properties was elucidated. This compound showed reversible photochromism both in solution and in a crystal with no spontaneous bleaching under dark conditions. The photocyclization quantum yield of the dithiazolylindole was as high as 83% in hexane, suggesting the photoreactive conformation was stabilized through intramolecular interactions. X-ray crystal structure analysis revealed that the dithiazolylindole adopted the photoreactive conformation with quasi-C2 symmetry around the hexatriene moiety in the crystalline state. This conformation was assisted by presumed intramolecular CH/N hydrogen bonding between the central N-methylindole and the side-chain thiazolyl units in combination with steric interactions between methyl groups at the reactive center carbons. The suggestion of intramolecular hydrogen bonding in solution was also supported by a 1H NMR variable temperature study.
► Highly sensitive photocoloration reaction of a new triangle terarylene, 2,3-dithiazolylindole.
► Intramolecular interactions control the molecular conformation and photoreactivity.
► X-ray crystallography and NMR study reveal intramolecular interactions.
Journal: Dyes and Pigments - Volume 92, Issue 2, February 2012, Pages 868–871