نتایج جستجو برای: achiral

تعداد نتایج: 1375  

Journal: :Soft matter 2014
L Lascialfari D Berti A Brandi S Cicchi M Mannini G Pescitelli P Procacci

The purpose of this study is to compare the gelling behavior of two molecules: a chiral compound and its achiral counterpart. The chiral partner is characterized by a rigid, chiral pyrrolidine nucleus, while the achiral one contains a flexible diethanolamine moiety. The chiral compound is an already known good organogelator, but also the achiral compound shows remarkable gelling properties. Ver...

2017
Ayman L. Hemasa Nenad Naumovski William A. Maher Ashraf Ghanem

Carbon nanotubes (CNTs) possess unique mechanical, physical, electrical and absorbability properties coupled with their nanometer dimensional scale that renders them extremely valuable for applications in many fields including nanotechnology and chromatographic separation. The aim of this review is to provide an updated overview about the applications of CNTs in chiral and achiral separations o...

Journal: :Chemical communications 2012
Fei Wang Yan-Xi Tan Hui Yang Yao Kang Jian Zhang

Solvent-induced chiral single-crystal to achiral single-crystal structural transformation is presented by two isomeric amino-functionalized metal-organic frameworks with 2-fold interpenetrating diamond topology, and the achiral form has high CO(2) uptake capacity.

Journal: :Chemical communications 2006
Manfred T Reetz Xiaoguang Li

A chiral diphosphonite, derived from BINOL and with an achiral diphenyl ether backbone, is an excellent ligand for the Ir-catalyzed asymmetric hydrogenation of quinolines; achiral P-ligands serving as possible additives (ee = 73-96%).

2005
JOHN B. ETNYRE

We show that any 4-manifold, after surgery on a curve, admits an achiral Lefschetz fibration. In particular, if X is a simply connected 4-manifold we show that X#S × S and X#S×̃S both admit achiral Lefschetz fibrations. We also show these surgered manifolds admit near-symplectic structures and prove more generally that achiral Lefschetz fibrations with sections have near-symplectic structures. A...

Journal: :Chemical communications 2014
Romina Wechsel Julien Maury Juliette Fremaux Scott P France Gilles Guichard Jonathan Clayden

The ability of urea-linked oligomers of achiral diamines (achiral analogues of the well-established chiral oligourea foldamers) to adopt helical conformations was explored spectroscopically. Up to four achiral units were ligated either to a well-formed helical trimer or to a single chiral diamine, and the extent to which they adopted a screw-sense preference was determined by NMR and CD. In the...

Journal: :Nanoscale 2015
Xiaoyang Duan Song Yue Na Liu

Chiral nanoplasmonics exhibits great potential for novel nanooptical devices due to the generation of a strong chiroptical response within nanoscale metallic structures. Recently, a number of different approaches have been utilized to create chiral nanoplasmonic structures. However, particularly for tailoring nanooptical chiral sensing devices, the understanding of the resulting chiroptical res...

2014
Christian Dressel Feng Liu Marko Prehm Xiangbing Zeng Goran Ungar Carsten Tschierske

Chiral segregation of enantiomers or chiral conformers of achiral molecules during self-assembly in well-ordered crystalline superstructures has fascinated chemists since Pasteur. Here we report spontaneous mirror-symmetry breaking in cubic phases formed by achiral multichain-terminated diphenyl-2,2'-bithiophenes. It was found that stochastic symmetry breaking is a general phenomenon observed i...

2008
A. Stoimenow

We examine and partially confirm some questions on properties of the the Alexander and HOMFLY polynomial of achiral knots. In particular we show that determinants of achiral knots are exactly the odd numbers representable as sums of two squares.

Journal: :Chemical communications 2013
Hao Wang Ze Chang Yue Li Rong-Mei Wen Xian-He Bu

Influenced by different cations in the self-assembly of chiral units, achiral (UOC-NH4, UOC-Ca) and chiral (UOC-Na) uranyl-organic compounds were obtained from achiral reactants. The photocatalytic activity of UOC-Na was also investigated.

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