Photochromism of neutral spiropyran in the crystalline state at room temperature

Abstract

Solid-state photochromic materials are very attractive due to their promising future in advanced functional materials with reversible and tunable optical properties. However, the development of photochromic material in the solid...

Reversible Adhesion Switching Using Spiropyran Photoisomerization in a High Glass Transition Temperature Polymer

“…The combination of high T g and nonpolarity is satisfied by ZX, but other polymers with these two attributes could also support this effect. A different approach would be to dispense with the polymer host entirely, and the development of SP derivatives that efficiently switch in solid form , provides another potential route to photoswitchable adhesion.…”

Acid-, mechano- and photochromic molecular switches based on a spiropyran derivative for rewritable papers

“…So, it is still acceptable to have weak fluorescence in the initial state. 44,45 Besides, we combined compounds 1 and 3 (n : n = 1 : 1) by physical blending and explored the solid photochromic properties. As shown in Fig.…”

Development of photochromic fused 2H-naphthopyrans with promising thermal fading rates

“…The synthetic route for 5/ 6NPs is shown in Scheme 2b. The cyclization of 2,2 0 -(2-(4-methoxynaphthalen-1-yl)-1,3-phenylene)bis(propan-2-ol) (10) to form 9methoxy-1,1,5,5-tetramethyl-1,5-dihydrobenzo[mno]aceanthrylene (11) is the key reaction of the synthetic route. Several catalysts This journal is © The Royal Society of Chemistry 2022 such as concentrated sulfuric acid, methanesulfonic acid, and PTSA have been tried in the cyclization reaction, but all failed to yield compound 11.…”

“…Photochromic materials have attracted considerable attention over the past two decades due to their potential applications in molecular switches, [1][2][3] optical memory devices, 4,5 molecular imaging, 6,7 and other advanced materials. [8][9][10][11] Among the photochromic chromene families, 2H-naphthopyrans have been studied extensively in a wide range of fields from materials sciences to industrial manufacturing such as ophthalmic lenses, [12][13][14] smart windows, 15 and photochromic textiles. 16,17 Upon UV light irradiation, the colorless closed form (CF) of 2H-naphthopyran undergoes a rapid photo-response to yield two colored open forms, namely, the transoid-cis (TC) and the transoid-trans (TT) forms (Fig.…”