نتایج جستجو برای: crown ether addition

تعداد نتایج: 750363  

Journal: :Journal of hazardous materials 2009
P K Mohapatra D S Lakshmi A Bhattacharyya V K Manchanda

Transport behaviour of (137)Cs from nitric acid feed was investigated using cellulose triacetate plasticized polymer inclusion membrane (PIM) containing several crown ether carriers viz. di-benzo-18-crown-6 (DB18C6), di-benzo-21-crown-7 (DB21C7) and di-tert-butylbenzo-18-crown-6 (DTBB18C6). The PIM was prepared from cellulose triacetate (CTA) with various crown ethers and plasticizers. DTBB18C6...

Journal: :Chemical communications 2007
Dario Braga Marco Polito Elena Dichiarante Katia Rubini Fabrizia Grepioni

On heating the hydrated complexes 18-Crown[6].M[H(2)PO(4)].xH(2)O (x= 2 for M = K, Rb; x= 1.5 for M = Cs), quantitatively prepared by mechanical mixing of crystalline 18-Crown[6] and M[H(2)PO(4)], to ca. 60 degrees C, water loss takes place, accompanied by the extrusion of the crown ether from the crystalline complex and followed by reconstruction of the inorganic phase M[H(2)PO(4)](M = K, Rb, ...

Journal: :Advanced Functional Materials 2023

Selective Proton Transport In article number 2215109, Tongwen Xu, Liang Ge, Xingya Li, and co-workers report a series of dibenzo-18-crown-6 functionalized sulfonated poly(biphenyl alkylene) membranes. The membranes possess synergistic hydrophilic networks induced by bi-functional sites (crown ether sulfonic-acid group), increasing selective proton transport, providing efficient acid recovery in...

Abbas Ali Zamani Mohammad Reza Yaftian Naser Dallali

The extraction-separation of lanthanum and europium ions with bis(2-ethylhexyl) phosphoric acid (DEHPA) in cyclohexane was improved by adding 12-crown-4 (12C4) to the aqueous phase as a masking agent. In the presence of this crown ether the extraction curve of lanthanum ions versus pH shifts to the higher pH region, while the curve is not influenced for the europium ions. Consequently the s...

Journal: :Journal of the Japan Institute of Metals and Materials 1995

Journal: :ACS Medicinal Chemistry Letters 2012

Journal: :Journal of Porphyrins and Phthalocyanines 2011

2001
SARI KIVINIEMI Harri Lönnberg Jouko Vepsäläinen

Study was made of host-guest complexation of neutral crown ethers with fiveand six-membered Nheteroaromatic cations and purinium cation. Complexation of tetraphenylborate with selected Nheteroaromatic cations and tropylium cation also was studied. Crown ether complexes were characterized by mass spectrometric and 1H NMR spectrometric methods and by X-ray crystallography. Fast atom bombardment m...

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