Colorimetric sensing of cyanide anions in aqueous media based on functional surface modification of natural cellulose materials
摘要:
The synthesis of two new water soluble azo dyes and their optical response to different anions is reported herein. Solution studies in water indicate that cyanide induces a colour change in these dyes, whereas no changes are observed in the presence of other anions, such as CH3COOH-, HSO4-, ClO3-, ClO4-, Cl-, Br-, H2PO4-, S2O3-, F-, NO3-, I-, NO2-, SO32-, S2-, C2O42-, SO42-, N-3(-), SCN-, F-, CO32-, HCO32-. In the second part of the paper, we report the incorporation of one of these dyes onto cellulosic fibres. The dye-sensitized cellulose materials were immersed in solutions of different anions and their response studied. The material is able to detect cyanide about 0.01-0.07 mu M in aqueous solution with high selectivity over other anions. (C) 2011 Elsevier Ltd. All rights reserved.
In this communication, for the first time we have constructed a series of novel azo group fused 2H-chromene-3-carboxylate and 3-acetyl-2H-chromene derivatives via the Knoevenagel condensation reaction of active methylene compounds with aromatic 5-arylazosalicylaldehydes followed by a nucleophilic addition of the phenolic hydroxyl group to the carbonyl group of one of the ester groups. Shorter reaction
A metallo-capped polyrotaxane containing calix[4]arenes and cyclodextrins and its highly selective binding for Ca2+
作者:Yu Liu、Hao Wang、Heng-Yi Zhang、Peng Liang
DOI:10.1039/b409356a
日期:——
A water-soluble nanometer-scale metallocapped polyrotaxane has been prepared by the inclusion complexation of azo-calixarenes with metallo-bridged bis(beta-CD)s, displaying highly selective binding for Ca(2+).
We have synthesized a new series of azo‐bis antipyrine derivatives from a one‐pot multicomponent Knoevenagel/Michael addition reaction of antipyrine, with a diversity of azo aldehydes in ethanol and L‐Proline as a catalyst under reflux condition. The anti‐inflammatory activity of the final products was assessed using the inhibition of albumin denaturation technique. Compound 3f showed an inhibitory
Synthesis, DFT studies, and cytotoxicity against (HepG-2) of some hetero furan-hydrazide derivatives
作者:Ghada E. Abd El Ghani、Alaa E. Hassanien、Ghada G. El-Bana
DOI:10.1016/j.molstruc.2023.135290
日期:2023.7
coupling of active methylene 3 with arylamine diazoniumsalts 10 a-h formed the corresponding 2-(2-furan-2-ylmethylene)hydrazineyl)-N-(4-substitutedphenyl)-2-oxoaceto-hydrazonoyl cyanide derivatives 11a-h in overall good yields. Furthermore, creating molecules with pyrazole rings was prepared by coupling acetohydrazide 3 with heterocyclic amine diazoniumsalts 14–16. The structural elucidation was achieved
在此,合成子合成子氰基-(呋喃-2-基亚甲基)-乙酰肼 ( 3 ) 被合成并用于构建多种含氮杂环化合物。乙酰肼3在沸腾的 EtOH 和 0.5 ml 哌啶中环化,得到 2-氰基-(呋喃-2-基亚甲基)-3-苯基丙烯酰肼 ( 5 )。此外,在 50 °C 存在下,通过搅拌起始部分3和 2-羟基-5-(苯基二氮烯基)苯甲醛衍生物6a-d,合成了一系列新的色烯-2-亚胺衍生物8a -d哌啶作催化剂。此外,活性亚甲基3与芳基胺重氮盐10 ah的偶联形成了相应的 2-(2-furan-2-ylmethylene)hydrazineyl)-N-(4-substituted phenyl)-2-oxoaceto-hydrazonoyl cyanide 衍生物11a-h,收率良好。此外,通过将乙酰肼3与杂环胺重氮盐14-16偶联来制备具有吡唑环的分子。通过 FTIR、1 H NMR 和13等不同光谱参数对
Ultrasonic-assisted synthesis of copper(II) azo coordination polymers, new precursors for direct preparation of metalic copper nano-particles
Nanostructures of coordination polymers, (CuL1). 0.5DMF. 0.5EtOH. 1.5H(2)O (1), = [H2L1 = 5-(4-Carboxy phenyl azo) salicyilic acid], (Cu(L-2)(2)) (2), [HL2 = 5-(4-Carboxy phenyl azo) salicylaldehyde] have been synthesized by the reaction of H2L1 and HL2 with Cu(OAc)(2)center dot H2O by sonochemical process. CuO nanostructures were synthesized from calcination and thermal decomposition of compounds 1-2 nanostructures. Metalic copper nanoparticles were prepared by direct calcination of compounds 1-2 in surfactant at 180 degrees C. These nanostructures were characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). Thermal stability of compounds 1-2 was studied by thermal gravimetric (TG) and differential thermal analyses (DTA). (C) 2013 Elsevier Ltd. All rights reserved.