Crowned spironaphthoxazine: lithium ion-selective colouration and ion-regulated thermal stability of its coloured form

Oxidation of photochromic spirooxazines by coinage metal cations. Part I. Reaction with AgNO3 : formation and characterisation of silver particles

“…14 However, when the indoline and naphthoxazine moieties are linked by an alkyl chain the con-®guration can be considered as rigid but cleavage still occurs in a polar solvent. 15 Thus, it can not be excluded that electronic eects inducing changes in the C±O bond polarization due to 1)±C( 12), 107.16 (12); N(2)±C( 1)±C (19), 103.52 (12); O(1)±C( 1)±C( 19), 110.13 (10); C( 12)±C( 1)±C (19), 115.48 (11). electron-donating substitution on C2 H may be responsible for the loss of photochromic activity.…”

Spirooxazines: synthesis, structure, spectral and photochromic properties

“…The first compound of this type, viz., SPO 180, was prepared by Japanese scientists. 125,126 They introduced a macrocyclic fragment into the starting 3-hydroxymethyl-2-naphthol. Other approaches were used by the Russian ± French research team, 58, 127 ± 129 who have actively developed this area of investigation in recent years.…”

Surface and photochemical properties of Langmuir monolayer and Langmuir–Blodgett films of a spiropyran derivative

“…A number of PMCs with different absorption bands have been developed by changing the skeleton of SP and by introducing various substituents into SP. The photochemical behavior has been investigated in various matrices 3 such as the crystalline state, 4,5 Langmuir-Blodgett (LB) films, [6][7][8][9] self-assembled monolayers, 10 vacuum-deposited films, 11 casting films, 12 liquid crystals, 13,14 solution, 15,16 and bilayer membranes dispersed in water. 17 In particular, the LB technique is interesting, because monolayers with a thickness less than several nanometers can be fabricated onto solid substrates at a molecular level.…”