NHC Tetranuclear Silver(I) Complexes and Intramolecular Extended π–π Interactions
摘要:
A series of new acyclic tetrazolium salts featuring a central anthracence building block which were 9,10-substituted with (N-R-azolium CH2CH2)(2)NCH2-groups were prepared (azolium = benzimidazolium or imidazolium, R = picolyl, ethyl, butyl, or benzyl). These tetrazolium salts were metalated with silver(I) leading to four novel NHC tetranuclear complexes 1-4. Molecular structures of 1-4 and one tetraimidazolium salt (LH4)-H-1 center dot(HgI4)(2) were established by H-1 NMR, C-13 NMR spectroscopy and X-ray crystallography. Silver(I) eta(3)-arene interactions exist in complex 1. Each molecule of complexes 2-4 contains one 42-membered and two 21-membered macrometallocycles. It was interesting to observe intramolecular extended pi-pi interactions originated from imidazole anthracene anthracene imidazole in complexes 3 and 4. In addition, the fluorescence emission spectra of the complexes and the tetrazolium salts were studied.
A novel anthracene-based tetraperimidine hexafluorophosphate 3 was prepared, and its structure was determined through X-ray analysis, HRMS as well as 1H and 13C NMR spectroscopy. In the cationic moiety of 3, two (N-ethylperimidinyl-C2H4)2NCH2- arms were attached to the 9- and 10-positions of anthracene. In addition, compound 3 was used as a chemosensor to research the ability to recognize Cr3+ through
制备了一种基于蒽的新颖的四亚丙基六氟磷酸酯3,并通过X射线分析,HRMS以及1H和13C NMR谱确定了其结构。在3的阳离子部分中,两个(N-乙基亚丙基-C 2 H 4)2 NCH 2-臂连接至蒽的9位和10位。此外,化合物3用作化学传感器,以研究通过荧光和UV滴定,HRMS以及1H NMR和IR光谱识别Cr3 +的能力。结果表明3是有效的Cr3 +化学传感器。
Nitrogen Mustards
作者:Evelyn Wilson、Max Tishler
DOI:10.1021/ja01152a023
日期:1951.8
Rapp; Kornew, Ukrainskij Khimicheskij Zhurnal, 1957, vol. 23, p. 637,639
作者:Rapp、Kornew
DOI:——
日期:——
A simple and robust PET-based anthracene-appended O-N-O chelate for sequential recognition of Fe3+/CN– ions in aqueous media and its multimodal applications
作者:Anup Pandith、Jun-Hyeak Choi、Ok-Sang Jung、Hong-Seok Kim
DOI:10.1016/j.ica.2018.07.007
日期:2018.10
A very simple, robust, and pico/nanomolar-sensitive 9,10-diethanolamine-substituted fluorescent Fe3+/CN- probe (PD) was synthesised, and its sensing abilities towards various ions were studied in mixed aqueous media. PD selectively recognised Fe3+ ions through a 'turn on' response with an excellent binding constant (K-a, 9.29x10(6)M(-1)) in 1:2 binding stoichiometry at pH 7.0 in phosphate-buffered saline (PBS). The in situ generated Fe3+center dot PD ensemble sequentially recognised CN- ions with an excellent binding constant (K-a 1.72x10(8)M(-1)) via a 'turn off' mode by extruding Fe3+ ions from the ensemble. The highly selective sequential 'on-off' responses towards Fe3+ and CN- ions were attributed to inhibition and restoration of photoinduced electron transfer (PET) and chelation-induced enhanced fluorescence (CHEF) effects from the chelating N and O heteroatoms. PD was able to detect Fe3+ and CN- ions in real water samples satisfactorily at picomolar to sub-nanomolar levels. A colorimetric assay based on pyrocatechol violet (PCV) was also able to detect Fe3+/CN- in a sequential manner (up to sub-micromolar level) by a change in colour from colourless to yellow/pale green without any interferences from other ions. Based on the complexation and decomplexation mechanism, bio-imaging photonic INHIBIT logic circuit strips were prepared for use under physiological conditions. In addition, solid-phase recognition of Fe3+/CN- ions was demonstrated using cost-effective paper-based strips.