A novel strategy for the dehydrogenation of the NH−NH bond is disclosed using potassium tert‐butoxide (tBuOK) in liquid ammonia (NH3) under air at room temperature. Its synthetic value is well demonstrated by the highly efficient synthesis of aromatic azo compounds (up to 100 % yield, 3 min), heterocyclic azo compounds, and dehydrazination of phenylhydrazine. The broad application of this strategy
METHOD OF MAKING UP WITH A LIGHT-SENSITIVE MAKEUP, AND A LIGHT-SENSITIVE MAKEUP COMPOSITION
申请人:SAMAIN Henri
公开号:US20100278761A1
公开(公告)日:2010-11-04
The present invention provides a method of making up human keratinous material with a light-sensitive makeup, in which:
i. a layer of a thermally stable photochromic composition comprising a photochromic agent capable of being developed by UV radiation and an optical agent that screens UV radiation is applied to the keratinous material; and
ii. the layer of composition is exposed in non uniform manner to UV radiation to excite the photochromic agent and create a light-sensitive makeup look, the screening power F of the composition as regards solar UV radiation (280 nm to 400 nm) being 2 or more.
本发明提供了一种使用光敏妆容来修饰人类角质材料的方法,其中:
i. 在角质材料上涂覆一层热稳定的光致变色组合物,该组合物包括能够通过紫外辐射激发的光致变色剂和用于屏蔽紫外辐射的光学剂;
ii. 以不均匀的方式暴露组合物层于紫外辐射,以激发光致变色剂并创造出一种光敏妆容外观,该组合物对太阳紫外辐射(280纳米至400纳米)的屏蔽能力F为2或更高。
Azobenzene-functionalized N-heterocyclic carbenes as photochromic ligands in silver(i) and gold(i) complexes
作者:Manuel Kaiser、Sebastian P. Leitner、Christa Hirtenlehner、Manuela List、Alexander Gerisch、Uwe Monkowius
DOI:10.1039/c3dt51565f
日期:——
The reaction of meta- and para-bromomethylene-azobenzenes with 1-methyl-imidazole yields the respective meta-/para-functionalized azobenzenes tagged with an imidazolium group. Similar reactions of ortho- and para-bromo-azobenzene with imidazole and successive quaternation with benzylbromide give the analogues, with an imidazolium group in ortho/para substituted azobenzenes. With the exception of the ortho derivative, all imidazolium salts could be transformed into their respective silver(I) complexes by reaction with Ag2O. Transmetallation of these silver(I) complexes with (Me2S)AuCl gives the azobenzene-containing complexes (NHC)AuCl. Two of these formed crystals suitable for X-ray diffraction, which revealed the typical linear coordination geometry of the NHC–Au–Cl moiety. All gold complexes feature E→Z photo-isomerisation upon irradiation with UV light. The thermal back reaction to the E-isomers is relatively slow and comparable to that of other azobenzene compounds.
The present teaching provides a fluorescent oligonucleotide probe having a high degree of design flexibility and wide applicability, as well as the use thereof. This is an oligonucleotide probe capable of forming a stem and loop, comprising at least one fluorophore located between adjacent nucleotides in the stem and is linked to a unit represented by Formula (1) and at least one quencher located at a site capable of pairing up with the at least one fluorophore located between the adjacent nucleotides in the stem and is linked to a unit represented by Formula (2). (In the formulae, X represents the fluorophore, Y represents the quencher, R1 represents an optionally substituted C
2
or C
3
alkylene chain, R2 represents an optionally substituted C
0-2
alkylene chain, and Z represents a direct bond or linker.)
A photochromic latex ink includes an organic polymer; optionally a colorant, and a photochromic compound. The photochromic ink composition has an average particle size from about 20 nm to about 600 nm. The photochromic ink composition is capable of reversibly converting from a first color to a second color in response to a predetermined wavelength scope.