نتایج جستجو برای: calix 4 arene

تعداد نتایج: 1305219  

Journal: :Chemical communications 2017
Yue Sun Yuxiao Mei Jiaxin Quan Xuan Xiao Lin Zhang Demei Tian Haibing Li

Correction for 'The macroscopic wettable surface: fabricated by calix[4]arene-based host-guest interaction and chiral discrimination of glucose' by Yue Sun et al., Chem. Commun., 2016, 52, 14416-14418.

Journal: :Chemical communications 2011
Ching Yong Goh Thomas Becker David H Brown Brian W Skelton Franca Jones Mauro Mocerino Mark I Ogden

Solution-phase and solid-state structural studies indicate that the remarkable hydrogelation properties of a proline-functionalised calix[4]arene emerge as a result of extended helical structures formed via inclusion of a proline moiety in a neighbouring calixarene cavity.

Journal: :Supramolecular Chemistry 2021

We present the synthesis and structure-activity relationships of sulfonatocalix[4]arene hosts bearing novel substitutions. The calix[4]arenes are modified on upper rim at either one or two phenolic units, where dual modifications introduced regioselectively neighbouring opposing phenols. mono- di-functionalised with nitro formyl groups, remaining upper-rim sites in all cases occupied by sulphon...

Journal: :Journal of the Brazilian Chemical Society 2021

The differences in the macrocyclic structures lead to different flexibilities, and yet effect of solvents on conformations is not clear so far. In this work, four representational molecules (pillar[5]arene, p-tert-butyl calix[6]arene, benzylic amide macrocycle dibenzo-18-crown-6) three with distinct polarity have been studied by all-atom molecular dynamics simulations. structural features macro...

Journal: :Malaysian Journal of Science. Series B, Physical & Earth Sciences 2022

This study examined the behaviors of Langmuir-Blodgett ultrathin calixarene films at air-water interface. The Langmuir trough was used to estimate surface pressure, potential, and effective dipole moment two calixarenes, namely, calix[4]arene (THC4) calix[8]arene (THC8). band gap determined using density functional theory (DFT). DFT simulation gave a 2.28 eV for THC4, confirming that THC4 an in...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2002
Francesco Sansone Laura Baldini Alessandro Casnati Marcio Lazzarotto Franco Ugozzoli Rocco Ungaro

Two neutral macrobicyclic anion receptors 4 and 6, containing a calix[4]arene in the cone conformation, two l-alanine units, and a 2,6-diacylpyridine or a phthaloyl bridge, are described. The x-ray crystal structure of the acetone complexes of the pyridine containing macrocycle 6 shows the four amide NH groups to be in close proximity to the chiral pocket delimited by the pyridine and one aroma...

2012
Dirk Steinhilber Florian Paulus Andrew T. Zill Steven C. Zimmerman Rainer Haag

In this paper we report on the preparation of calix[8]arene functionalized polyglycerol nanogels by miniemulsion polymerization. The gel macromonomers were prepared by anionic ring-opening multibranching polymerization of glycidol using calix[8]arene as initiator. 1,1 ,3,3,3 ,3 -hexamethyl-2,2 -indotricarbocyanine iodide (HITC) red fluorescent dye was used as a guest molecule. Photobleaching up...

2016
Rahman Hosseinzadeh Mohammad Nemati Reza Zadmard Maryam Mohadjerani

Functionalization of calix[4]arene with amidofluorene moieties at the lower rim led to formation of the 1,3-diconjugate of calix[4]arene L as a novel fluorescent chemosensor for Cu(2+). The receptor molecule L exhibited a pronounced selectivity towards Cu(2+) over other mono and divalent ions. The formation of the complex between L and Cu(2+) was evaluated by absorption, fluorescence and (1)H N...

2016
O. Y. Saiapina S. G. Kharchenko S. G. Vishnevskii V. M. Pyeshkova V. I. Kalchenko S. V. Dzyadevych

The conductometric sensor based on 25,27-di-(5-thio-octyloxy)calix[4]arene-crown-6 was developed for the quantitative analysis of ammonium. The calixarene was immobilized on the surface of the planar interdigitated electrodes by attachment of its dialkyl sulfide groups to the surface of the gold electrodes. The intrinsic ability of the calixarene to capture ammonium was studied in the conductom...

Journal: :Nanoscale 2014
Xianjue Chen Kasturi Vimalanathan Wenzhe Zang Ashley D Slattery Ramiz A Boulos Christopher T Gibson Colin L Raston

Patterns of noble metal nanoparticles (NMNPs) of ruthenium and platinum are formed on p-phosphonic acid calix[8]arene stabilised graphene in water. This involves hydrogen gas induced reduction of metal ions absorbed on the stabilised graphene, with TEM revealing the patterns being comprised of domains of parallel arrays of NMNPs ∼7 nm apart. The domains are orientated in three directions on eac...

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