Formation of Exciplexes in Films of Polyimides, Polyamides, and Polyquinazolones Derived from Aromatic and Heteroaromatic Diamines
作者:N. I. Rtishchev、G. I. Nosova、N. A. Solovskaya、K. A. Romashkova、V. V. Kudryavtsev
DOI:10.1007/s11176-005-0471-z
日期:2005.10
The emission bands exchibited by films of polyimides derived from 1,3-bis(3,4-dicarboxyphenoxy)benzene dianhydride, hexafluoroisopropylidenedibenzene-3,3′,4,4′-tetracarboxylic dianhydride, and aromatic and heteroaromatic diamines, and also of polyamides and polyquinazolones derived from the same amines are exciplex bahnds. With polyamides, complexes in the ground state are formed. The fluorescence of the photoconductivity sensitizer Rhodamine 6G is quenched in films of these polymers by the exciplex mechanism.
Among these inhibitors, N‐1‐guanyl‐1,7‐diaminoheptane (GC7) has been co‐crystallized in the active site of DHS. However, despite its potency, GC7 is not selective enough to be used in drug applications. Therefore, new compounds that target DHS are needed. Herein we report the in silicodesign, chemical synthesis, and biological evaluation of new DHS inhibitors. One of these inhibitors showed dose‐dependent
Synthesis of Bismaleimides Bearing Electron-Donating Chromophores and Their Fluorescence Behavior during Copolymerization
作者:Xin Zhang、Ying-Hua Jin、Hui-Xiang Diao、Fu-Sheng Du、Zi-Chen Li、Fu-Mian Li
DOI:10.1021/ma0205111
日期:2003.5.1
(symbolized as A(=)−D(*)−A(=)), as well as their saturated modelcompounds were synthesized, and their steady-state and time-resolved fluorescence spectra were investigated. These A(=)−D(*)−A(=) monomers display strong intramolecular fluorescence quenching. Their fluorescence quantum yields and lifetimes are generally lower than those of their modelcompounds. It was found that the electron-poor CC bond of maleimide
带有二苯基甲胺,三苯胺或2,5-二苯基-1,3,4-恶二唑发色团(表示为A (=)-D (*) -A (=))的双马来酰亚胺和双钛亚酰亚胺以及它们的饱和模型化合物为合成,并研究了它们的稳态和时间分辨荧光光谱。这些A (=)- D (*) -A (=)单体显示出强烈的分子内荧光猝灭。它们的荧光量子产率和寿命通常低于其模型化合物的荧光量子产率和寿命。发现马来酰亚胺和衣康酰亚胺单元的电子贫C C C键(A (=))起着分子内淬灭,这是相关的A的电子接受能力的关键作用(=) A之间的几何布置和(=)和给电子性发色团(d (*) )。分子内猝灭归因于分子内电荷转移相互作用,这通过分子间荧光猝灭和时间分辨荧光研究得到证实。在分子内猝灭的基础上,可以开发一种新的荧光方法来监测双马来酰亚胺的聚合和固化过程,该过程可以直接反映出碳原子数。聚合和固化过程中的C键消耗量。新的荧光方法不仅可以通过本征荧光技术来利用,而且可以通过外在荧光技术来利用。
A Binuclear Cu<sup>II</sup>Metallacycle Capable of Discerning between Pyrazine and Its Different Methyl-Substituted Derivatives Based on Reversible Intracage Metal-Ligand Binding
Squashy cage: A flexible, spongelike, and reversible metal‐binding Cu2L2 cage that can adjust its internal space in response to pyrazine and itsderivativesbased on a recognition sequence of pyrazine, 2,5‐dimethylpyrazine, and 2‐methylpyrazine (see figure) is described.
壁球笼:一种柔软的,海绵状且可逆的与金属结合的Cu 2 L 2笼,可以根据吡嗪,2,5-二甲基吡嗪和2-甲基吡嗪的识别序列来调节吡嗪及其衍生物的内部空间(参见图)进行说明。
Certain azoles exhibiting ATP-utilizing enzyme inhibitory activity, compositions, and uses thereof
申请人:Mendoza Serafin Jose
公开号:US20080015193A1
公开(公告)日:2008-01-17
Certain oxazole-based compounds exhibiting ATP-utilizing enzyme inhibitory activity, methods of using compounds exhibiting ATP-utilizing enzyme inhibitory activity, and compositions comprising compounds exhibiting ATP-utilizing enzyme inhibitory activity, are disclosed.