Stereospecific diaza-Cope rearrangement as an efficient tool for the synthesis of DPEDA pyridine analogs and related C<sub>2</sub>-symmetric organocatalysts
作者:A. S. Kucherenko、A. A. Kostenko、V. V. Gerasimchuk、S. G. Zlotin
DOI:10.1039/c7ob01852e
日期:——
A simple and efficientsynthesis of enantiomericallypure (1S,2S)-1,2-di(pyridin-2-yl)- and (1R,2R)-1,2-di(pyridin-4-yl)-ethane-1,2-diamines from commercial picolinaldehyde or isonicotinaldehyde and 2,2′-((1S,2S)-1,2-diaminoethane-1,2-diyl)diphenol (HPEN) via a stereospecific diaza-Cope rearrangement has been developed. Diamine (R,R)-2b was readily converted to novel diastereomeric ionic group-supported
Two isostructural polyoxometalate-based inorganic–organic hybrids with 1D helical chain, [CuH3L2(GeMo12O40)]·2H2O (1) and [CuH3L2(SiMo12O40)]·2H2O (2), where L=2,4,5-tri(4-pyridyl)-imidazole have been synthesized under hydrothermal conditions. It is the first time to use the L ligand to synthesis the Keggin-type polyoxometalate-based inorganic–organic hybrids. The twocompounds possess the left- and
两个具有一维螺旋链的基于多金属氧酸盐的异结构杂化体,[CuH 3 L 2(GeMo 12 O 40)]·2H 2 O(1)和[CuH 3 L 2(SiMo 12 O 40)]·2H 2 O (2),其中L= 2,4,5-三(4-吡啶基)-咪唑是在水热条件下合成的。这是第一次使用L配体来合成基于Keggin型多金属氧酸盐的无机-有机杂化物。这两种化合物均具有左旋和右旋螺旋链,而POM则通过Cu-O键连接到悬垂的螺旋链中。这两种化合物已通过元素分析,红外(IR)光谱,粉末X射线衍射(PXRD),X射线光电子能谱(XPS),热重分析(TGA)和光致发光光谱进行了表征。此外,已经研究了氮吸附-解吸测量,在化合物1的UV辐射下降解亚甲基蓝(MB)的电化学和光催化性能。
Modulated preparation and structural diversification of metal–organic frameworks based on 4,4′,4″-(1H-imidazole-2,4,5-triyl)tripyridine ligand
作者:Jun-Jie Wang、Ren-Chun Zhang、Dao-Jun Zhang、Yun-Feng Shi、Ying-Hui Zhang、Xiao-Li Lu、Er-Ni Wang、Feng Jin
Luminescent coordination polymers constructed using a mixed-ligand strategy for highly selective luminescence sensing of nitrobenzene, Fe<sup>3+</sup> and Cr<sub>2</sub>O<sub>7</sub><sup>2−</sup> ions and photodegradation of rhodamine B
5-benzenetetracarboxylic acid) were constructed. Compounds 1–4 and 7–9 have similar 2D 44 networks, while 5, 6 and 10 show 1D chain structures. The results reveal that the coordination configuration of M(II), carboxylic acids, and coordinated water molecules play pivotal roles in the formation of the final structures. Moreover, the selective luminescence sensing and photocatalytic performances of 1–10 were
Supramolecular isomerism, single-crystal to single-crystal transformation induced by release of in situ generated I2 between two supramolecular frameworks
Two supramolecular isomers, [H2tpim·H4betc]·I (1) and [H2tpim·H4betc]·I3·2H2O (2), have been synthesized by one-pot reactions. Single-crystal to single-crystal transformations are observed between the two supramolecular isomers which are induced by release of in situ generated I2.