已经报道了以均三甲苯/三乙苯作为核心部分、尿素/硫脲作为结合基团和对硝基苯作为信号单元的七种中性三足和双足受体。受体充当用于小型和球形F离子的选择性比色,肉眼传感器,其来自四面体离子的干扰。硫脲衍生物与 F− 阴离子形成稳定的 1:1 H 键配合物,并在一定程度上与阴离子形成稳定的 1:1 H 键配合物,而对于尿素衍生物,识别仅基于脲酸质子和碱性 F− 离子之间的酸碱反应,并且是完全可逆的现象。硫脲衍生物的预组织及其高内在酸度应该有助于它们与 F-阴离子形成强 H 键复合物。尿素基受体在较低浓度的阴离子时不响应,
Mesitylene based azo-coupled chromogenic tripodal receptors—a visual detection of Ag(I) in aqueous medium
作者:Vimal K. Bhardwaj、Narinder Singh、Maninder Singh Hundal、Geeta Hundal
DOI:10.1016/j.tet.2006.05.047
日期:2006.8
ligands 3a–d, based on a mesitylene anchor, containing aza-thioethers as donor atoms and coupled with 4-(4/3/2-nitrophenyl)azophenol or 4-(2-chlorophenyl)azophenol have been synthesized as chromogenicreceptors, which are highly selective for silver(I). The complexation behavior of 3a–d with various metal ions has been evaluated by UV–vis spectrometry in dioxane/water (1:9/v:v) solution at 25 °C. The
This invention pertains to novel aromatic, sulfur-containing triamines of the general formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are each alkyl containing from 1 to 3 carbon atoms and Y is ##STR2## The present compounds are useful crosslinking agents that significantly decrease the curing time of elastomeric urethane/urea copolymers.
A new series of tripodal receptors bearing imine linkages have been prepared in high yields, by a single step condensation reaction between tripodal aromatic amines and aldehydes, using zinc perchlorate as a template. The template cation leaves the pseudo cavity after the Schiff base condensation to give metal free multidentate ligands. These products have been characterized by H-1, C-13 NMR, IR, elemental analysis, UV-vis absorption spectroscopy and X-ray crystallographic studies. It has been seen that the presence of a coordinating atom such as 0, S, and N at position-2 with respect to the carbonyl group, is mandatory for the reaction to proceed. The template reaction has been also successfully employed to synthesize a lariat type coronand by reacting the tripodal amine with a dialdehyde. (c) 2005 Elsevier Ltd. All rights reserved.
A Multifunctional Tripodal Fluorescent Probe: “Off−On” Detection of Sodium as well as Two-Input AND Molecular Logic Behavior
作者:Navneet Kaur、Narinder Singh、Donald Cairns、John F. Callan
DOI:10.1021/ol900388x
日期:2009.6.4
A simple tripodal sensor (3) with multifunctional capability has been synthesized in three steps. The sensor, a naphthalene-functionalized Schiff base, displays selectivity for sodium over other important physiological and environmentally important cations through changes in the emission spectra at lambda(max) 355 nm when excited at 270 nm. Interestingly, the combined addition of both sodium and potassium produced a new band at lambda(max) 445 nm, while the addition of sodium or potassium alone produced negligible changes at this wavelength. Therefore, the conditions of a two-input AND logic operator were also satisfied.
A tripodal receptor bearing catechol groups for the chromogenic sensing of F− ions via frozen proton transfer
作者:Vimal K. Bhardwaj、Maninder Singh Hundal、Geeta Hundal
DOI:10.1016/j.tet.2009.08.023
日期:2009.10
A neutral tripodal Schiff base receptor (3) having catechol as end groups has been synthesized and characterized with the help of spectroscopic and single crystal X-ray crystallographic studies. The receptor behaves as a visually detectable optical sensor for F- ions in DMSO, sensitive enough to recognize the ions up to a concentration 1 x 10(-5) M with naked eye. The chromogenic response is based upon the deprotonation of the highly acidic catechol moieties in the presence of highly basic F- ions in a polar solvent like DMSO. (C) 2009 Elsevier Ltd. All rights reserved.