Photochromic compounds based on ring opening and closing of an [1,3]oxazine compound
申请人:Raymo Francisco M.
公开号:US20110095243A1
公开(公告)日:2011-04-28
We have designed a molecular switch based on the photoinduced opening and thermal closing of a [1,3]oxazine ring. A substituted [1,3]oxazine compound described as having a general (i.e., unsubstituted) structure with fused indoline and benzooxazine fragments such that they share a common bond in the [1,3]oxazine compound: (i) the bond connecting positions 1 and 2 of the indoline fragment and (ii) the bond connecting positions 2 and 3 of the benzooxazine fragment. Irradiation by light of suitable wavelength and intensity of this photochromic compound induces cleavage of a [C—O] bond of the [1,3]oxazine ring to form a phenolate chromophore. The photogenerated (e.g., colored) isomer may revert thermally to the starting (e.g., colorless) oxazine. Alternatively, the switch may be between isomers of the compound that absorb at different wavelengths. Reversible coloration of silica or polymeric materials and switching optical signals may involve many cycles of interconversion between different colored states. A colorless/colored state may be maintained by constant irradiation or chemical trapping.
我们设计了一种基于[1,3]噁唑环的光诱导开合和热闭合的分子开关。该取代[1,3]噁唑化合物的结构为一般(即未取代)的结构,具有融合的吲哚啉和苯噁唑片段,使它们在[1,3]噁唑化合物中共享一个共同的键:(i)连接吲哚啉片段的1和2位置的键和(ii)连接苯噁唑片段的2和3位置的键。通过适当波长和强度的光照射这种光致变色化合物,可以引发[1,3]噁唑环的[C-O]键裂解,形成酚酸色团。光诱导的(例如有色的)异构体可以通过热反转回起始(例如无色的)噁唑。或者,开关可以在吸收不同波长的化合物异构体之间进行。可逆地染色硅胶或聚合材料和切换光学信号可能涉及多个不同着色状态之间的多个循环的相互转化。无色/有色状态可以通过恒定的照射或化学捕获来维持。