Synthesis, structure and photochromic properties of indoline spiropyrans with electron-withdrawing substituents

Multifunctional switching properties of “wire-like” dinuclear ruthenium bis-alkynyl spiropyran complexes

“…The pyran also adopts the puckered envelope structure seen in the literature. 96,[101][102][103][104] The chromene moiety is also bent away from the plane of the O1-C2-C3 (θ) atoms by 23.30°. This bending has previously been ascribed to crystal packing rather than electronic effects.…”

Structure and Properties of 1,3,3-Trimethyl-6′-chlorospiro[indoline-2,2′-2H-chromene]

“…But, the presence of a nitro group in a spiropyran molecule leads to the involvement of low-lying triple excited states of the molecule in the photophysical mechanism of photoinduced transformations and determines their tendency to photodegradation [8]. Consequently, the search and study of spirocyclic structures modified with electronwithdrawing substituents other than nitro group is a promising area of investigations [9]. This article is devoted to the study of indoline spiropyran 1 containing a chlorine atom as an σ-acceptor substituent in 6′ position.…”

Отрицательный Фотохромизм: Последние Достижения

“…В процессе синтеза индолиновых спиро-пиранов, содержащих сопряженные катионные винил-3Н-индолиновые фрагменты и их аналогов с формильным заместителем в 2Н-хроменовом фрагменте получено соединение СП 23, проявляющее отрицательный фотохромизм под действием УФ излучения [19]. Пиридиний-содержащий спиропиран СП 24 проявляет отрицательный фотохромизм в растворах и положительный фотохромизм в кристаллическом состоянии [20].…”