罗丹明螺内酰胺(RSLs)由于其荧光开通能力和在螺内酰胺氮上的易于官能化功能,最近已成为流行的荧光pH探针。RSL的设计通常是由生物学靶向或相容性问题驱动的,而不是探针的pH敏感性,并且人们对RSL结构与p K a之间的关系还不太了解。为了阐明p K a值与螺内酰胺氮上取代基的性质之间的关系,提出了一系列19种苯胺衍生的RSL。选自二衍生的RSL邻-取代的苯胺表现出p ķ一个可调谐性横跨中等酸性区域(约pH 4-6)。p的评估使用Fujita-Nishioka模型的邻位取代基效应的K a数据表明,空间和电子取代基的性质均会影响RSL pH响应性,p K a值随取代基尺寸和吸电子特性的增加而增加。这些趋势归因于由大取代基引起的RSL结构的变化,以及对质子化螺环反应中间体的电子影响。为了证明这些探针在完全水性环境中的实用性,我们提出了RSL掺杂的共轭聚合物纳米颗粒,该纳米颗粒表现出对不断变化的pH值的比例荧光响应。
Composition for the coloring of keratinous fibers comprising a halochromic compound and/or the dye corresponding to this compound, and method of use thereof
申请人:Guerin Frederic
公开号:US20080244838A1
公开(公告)日:2008-10-09
Disclosed herein is the use, in the coloring of keratinous fibers, such as human keratinous fibers, such as the hair, of a composition comprising at least one compound chosen from the compounds of formula (I) comprising a cyclic group G including a ring H capable of opening, the dyes corresponding to the compounds of formula (I) wherein the ring H is open, and the addition salts thereof:
and a method for treating keratinous fibers employing this composition.