报道了荧光有机一氧化碳释放分子oCOm-57、oCOm-58和oCOm-66的合成。这些 oCOm 是水溶性的,并且在生理条件下释放 CO 时会表现出“开启”荧光行为。oCOm-66还含有一个额外的硝基萘酰亚胺部分,可用作荧光报告分子。使用共聚焦显微镜与 MitoTracker Red 一起证实了从这些 oCOm 释放的 CO 递送至 AC-16 心肌细胞的线粒体。虽然发现中性的聚乙二醇化oCOm-57保留在细胞外环境中,释放 CO 以扩散到细胞隔室中,但带正电荷的oCOm-58和-66靶向线粒体释放 CO。值得注意的是,在活细胞成像中使用荧光 oCOm 可以表征细胞内 CO 递送和 oCOm 定位。这项细胞共聚焦研究还表明,从这些分子释放的亚毒性浓度的 CO 保留了线粒体能量,如膜电位依赖性 MitoTracker Red 所示。
In a first aspect, the present invention relates to a perovskite material comprising negatively charged layers alternated with and neutralized by positively charged layers; the negatively charged layers having a general formula selected from the list consisting of: L
n−1
M
n
X
3n+1
, L
n
M
n
X
3n+2
, and L
n−1
M′
n
X
3n+3
, and the positively charged layers comprising: one or more organic ammonium cations independently selected from monovalent cations Q and divalent cations Q′, or a polyvalent cationic conjugated organic polymer Z, wherein Q, Q′ and Z comprise each a π-conjugated system in which at least 8 and preferably at least 10 atoms participate, L is a monovalent cation, M
n
are n independently selected metal cations averaging a valence of two, M′
n
are n independently selected metal cations averaging a valence equal to 2+2/n, X is a monovalent anion, and n is larger than 1.
Reactions of 7,9-dimethyl-, 7,9-diethyl-, and 7,9-di-n-propyl-8H-cyclopenta[a]acenaphthylen-8-oneswith dimethyl 1-cyclobutene-l,2-dicarboxylate afforded the corresponding decarbonylated 1:1 adducts, while a similar addition of 7,9-diisopropyl-8H-cyclopenta[a]acenaphthylen-8-one onto the cyclobutene gave a 1:1 adduct. The photoaromatization and valence tautomerization of these adducts were examined.
in refluxing xylene to afford the cyclo-octatetraenes 12, via a sequence involving [4+2]π-cycloaddition, cheletropic loss of carbon monoxide, extrusion of dimethyl phthalate by [4+2]π-cycloreversion, and finally valence isomerisation by retro-6π electrocyclisation. NMR evidence indicates that the products 12 contain rigid, bond-fixed, non-planar cyclo-octatetraene rings.
Exceptional dimerisation of 7,9-dimethylcyclopent[a]acenaphthylen-8-one; X-ray crystal structure of the diol–diacetate of one of the dimeric products
作者:David W. Jones、Walter S. McDonald
DOI:10.1039/c39800000417
日期:——
In solution at 20 °C the cyclopentadienone (1) is in equilibrium with the normal endo-Diels–Alder dimer (2) and the formal [π2 +π2]-dimer (3) the structure of the diol–diacetate of which has been determined by X-ray crystallography; on heating at 80 °C this mixture affords the exo-Diels–Alder dimer (4).