77180-45-1Relevant academic research and scientific papers
The synthesis and property of dihydropyrene derivatives containing a nitrogen atom
Chifuku, Kazufumi,Sawada, Tsuyoshi,Kuwahara, Yutaka,Shosenji, Hideto
, p. 369 - 381 (2008/03/12)
Dihydropyrene (DHP) is 14π aromatic compound and applied as an aromatic probe by chemical shift of internal methyl groups in 1H-NMR spectra. DHP containing a nitrogen atom 1a and 2a were designed as photochromic compounds which were restrained thermal-isomerization. 1a and 2a were confirmed as DHP types by 1H-NMR spectra. Chemical shifts of internal methyl groups of 1a and 2a were observed at the lower magnetic field than that of DHP 3a. According to optimized structures of 1a and 3a, it was expected that the internal methyl group located of the out at center of 14π annulene ring. Isomerization to [2.2]metacyclophanediene 1b from DHP 1a by photo-irradiation of visible light was not observed.
Synthesis and photochromic properties of molecules containing [e]-annelated dihydropyrenes. Two and three way π-switches based on the dimethyldihydropyrene-metacyclophanediene valence isomerization
Mitchell, Reginald H.,Ward, Timothy R.,Chen, Yongsheng,Wang, Yunxia,Weerawarna, S. Ananda,Dibble, Peter W.,Marsella, Michael J.,Almutairi, Adah,Wang, Zhi-Qiang
, p. 2974 - 2988 (2007/10/03)
The syntheses of several new simple negative, a simple positive, and multiple negative photochromes containing the dihydropyrene-cyclophanediene photochromic system are described. The photo-openings of the negative photochromes, the [e]-annelated benzo (7
