使用稳态和时间分辨光谱学研究了三种新型基于萘酰亚胺的“超级”光酸的基态和激发态酸碱性质。这些化合物的p K a = 8.8-8.0,p K a * = -1.2至-1.9。基态和激发态p K a的降低都是通过在芳香族体系上连接一个吸电子基团(磺酸盐)来实现的。在酒精和DMSO中激发后,所有化合物都会去质子化。在一定溶剂中,p K a *与中性和阴离子发射强度之比之间建立了良好的相关性。激发态分子间质子转移到溶剂中(H 2O和DMSO)通过两步模型进行解释。在第一步中,发生短程质子转移,从而形成接触离子对。在扩散控制的第二步骤中形成自由离子对。
N-(Aminoalkyl)imide antineoplastic agents. Synthesis and biological activity
作者:Robert K. Y. Zee-Cheng、C. C. Cheng
DOI:10.1021/jm00147a016
日期:1985.9
substitution on certain chosen ring systems, and (d) combinations of the aforementioned variants. Preliminary biologicalactivity screening indicated that N-(dialkylaminoethyl)imides of the 3,6-dinitro- and 3,6-diamino-1,8-naphthalic acid system possessed prominent antileukemia and antimelanoma activity in both in vitro and in vivo experimental tumor systems.
Accelerating the Shuttling in Hydrogen-Bonded Rotaxanes: Active Role of the Axle and the End Station
作者:Tatu Kumpulainen、Matthijs R. Panman、Bert H. Bakker、Michiel Hilbers、Sander Woutersen、Albert M. Brouwer
DOI:10.1021/jacs.9b10005
日期:2019.12.4
The relation between the chemical structure and the mechanical behavior of molecularmachines is of paramount importance for a rational design of superior nanomachines. Here, we report on a mechanistic study of a nanometer scale translational movement in two bistable rotaxanes. Both rotaxanes consist of a tetra-amide macrocycle interlocked onto a polyether axle. The macrocycle can shuttle between an
Calix[4]arene-Functionalized Naphthalene and Perylene Imide Dyes
作者:Myroslav O. Vysotsky、Volker Böhmer、Frank Würthner、Chang-Cheng You、Kari Rissanen
DOI:10.1021/ol026402o
日期:2002.8.1
[reaction: see text] Calix[4]arenes bearing one, two, or four 1,8-naphthyl imide groups at the wide rim and bis-calix[4]arenes connected via perylene-bisimide dye spacers have been synthesized. The low-temperature NMR spectrum of the tetranaphthylimide suggests, in agreement with a crystal structure, a C2-symmetrical pinched cone conformation stabilized via face-to-face pi-pi interactions between opposite
Complexes of a naphthalimide photoacid with organic bases, and their excited-state dynamics in polar aprotic organic solvents
作者:Tatu Kumpulainen、Bert H. Bakker、Albert M. Brouwer
DOI:10.1039/c5cp02556g
日期:——
groups resulting in strong negative cooperativity (K1 ≫ 4K2) in the formation of the 1 : 2 complex. Time-resolved fluorescence studies of the complexes provide strong indications of a three-step dissociation process. The species involved in the model are: a hydrogen-bonded complex, a hydrogen-bonded ion pair, a solvent separated ion pair, and a free ion pair.
7H-benzimidazo[2,1-a]benz[de]isoquinoline-7-ones, or a pharmaceutically-acceptable salt thereof, are useful immunosuppressives in the treatment of warm-blooded animals.