刺激响应型罗丹明衍生物:酸致变色行为与动态信息显示

Stimuli-responsive rhodamine derivatives:acidochromism behaviors and dynamic fluorescence multi-information display

刺激响应智能荧光材料是指通过施加不同的外界刺激(如热、pH、机械力等),材料自身的化学或物理性能发生相应变化的新型功能材料,广泛应用于荧光传感器、生物成像、信息加密、智能显示等领域.罗丹明及其衍生物因其环境敏感性和光学开关特性而受到广泛关注.本工作开发了一种苯基桥连的双罗丹明衍生物2RE,对三氟乙酸(TFA)展示了明显的酸致变色行为,呈现比色/荧光双模式响应且强度变化具有时间依赖性.通过交替加入TFA和三乙胺(TEA),可调节该材料的荧光颜色在无色和橙红色之间进行变换,开发了“关闭-开启”(off-on)和“开启-关闭”(on-off)的双模式酸致变色材料,可循环切换至少15次.基于酸致变色这一特性,该材料在溶液相和纸质材料上展现了动态荧光多信息显示和信息存储的应用潜力.

Stimuli-fluorochromic smart materials(SFSMs) exhibit outstanding chemical or physical changes upon different external stimuli(heat,pressure,pH,and solvents,etc.),and are widely used in fluorescence sensors,biological imaging,information encryption,intelligent display and anti-counterfeiting,etc.Rhodamine derivatives have drawn increasing attention due to their environmental sensitivity and optical switching properties.In this paper,a phenylbridged bis-rhodamine derivative,2RE,was developed.It showed excellent acidochromism behaviors using trifluoroacetic acid(TFA) as the acid source,a colorimetric/fluorescent dual-mode response with a time-dependent intensity change.The fluorescence color of the material was regulated to change between colorless and orange-red by alternately adding TFA and triethylamine(TEA).The acidochromism materials with dual-mode “off-on” and “on-off”can be cyclically switched at least 15 times.By taking advantage of the acidochromism property,the material in solution phase and on paper shows potential for applications in dynamic fluorescence multi-information display and information storage.