Spontaneous asymmetric crystallization of a quartz-type framework from achiral precursors

Zheng, Wenxu; Wei, Yong; Xiao, Xueying; Wu, Kechen

doi:10.1039/c2dt12238c

Cited by 14 publications

(10 citation statements)

References 30 publications

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“…Chiral surfaces and nanofilms with spatial fibrous morphology can be prepared using 3D templating systems, such as fibers and helical tubes. Chiral templated-surfaces can be fabricated using different chemical processes, among are sol–gel approach, atomic layer deposition (ALD), − and chemical vapor deposition (CVD) . For example, chiral-templated single-handed helical zirconia nanotubes and chiral titania fibers were prepared by the sol–gel approach.…”

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confidence: 99%

Chiral Metal-Oxide Nanofilms by Cellulose Template Using Atomic Layer Deposition Process

et al. 2017

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In this article, we describe an advance approach for the fabrication of chiral metal-oxide nanofilms. Our approach is based on the atomic layer deposition of titania and alumina nanofilms onto cellulose microfibers, used as chiral templates, leading to the formation of chiral nanofilms with a spatial fibrous structure. The chiral nanofilms were extensively characterized by X-ray photoelectron spectroscopy and high-resolution electron microscopy. The chiral property of the produced titania nanofilms was studied by enantioselective adsorption experiments using circular-dichroism spectroscopy and chiral high-performance liquid chromatography. We demonstrate the application of the titania chiral nanofilms for enantioselective crystallization. Overall, the basic principle for the preparation of chiral nanofilms by atomic layer deposition is demonstrated, as well as their uses for several enantioselective applications.

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confidence: 99%

Chiral Metal-Oxide Nanofilms by Cellulose Template Using Atomic Layer Deposition Process

et al. 2017

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“…The Flack parameter finds widespread use in the study of novel chiral systems such as helicates, cyclic helicates and knotted systems exhibiting topological chirality and has been used to establish the absolute configuration of molecular trefoil knots assembled in self-sorting processes [152]. The use of the Flack parameter to establish the asymmetric crystallization of coordination networks and metal-organic frameworks is an interesting new development [153][154][155].…”

Section: The Influence Of Flackmentioning

confidence: 99%

When Stereochemistry Raised Its Ugly Head in Coordination Chemistry—An Appreciation of Howard Flack

Constable

Housecroft

2020

Chemistry

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Chiral compounds have played an important role in the development of coordination chemistry. Unlike organic chemistry, where mechanistic rules allowed the establishment of absolute configurations for numerous compounds once a single absolute determination had been made, coordination compounds are more complex. This article discusses the development of crystallographic methods and the interplay with coordination chemistry. Most importantly, the development of the Flack parameter is identified as providing a routine method for determining the absolute configuration of coordination compounds.

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“…Generally, CCPs could be obtained by introducing certain chiral agents to play as components, counterions, templates, or structural directing agents. − The limited species of commercial chiral agents and their high cost have hindered the development of CCPs. On the other hand, people have found that CCPs could also be prepared by adopting normal achiral starting materials, without any chiral agents (named a CCPs in the following discussion). − This phenomenon is usually called “spontaneous resolution”. However, the products of those a CCPs were always racemic mixture (conglomerates) or racemic solid solution, which makes the study of application difficult.…”

Section: Introductionmentioning

confidence: 99%

Viedma Ripening of Chiral Coordination Polymers Based on Achiral Molecules

Zhang

et al. 2019

Crystal Growth & Design

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When the chiral coordination polymers were composed of achiral molecules, the deracemization of the bulk product remains a great challenge if without any chiral induction. The Viedma ripening theory was adopted herein to help the achievement of mirror symmetry breaking for the bulk chirality of two chiral coordination polymers. The enantiomeric excess of the bulk chirality for the first compound is about 100%, which means absolute asymmetric synthesis. The deracemization degree of the bulk chirality for the second compound fluctuates occasionally. Further study has discussed the different deracemization degree of the bulk chirality for two compounds with the consideration of enantioselective incorporation in crystal cluster.

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Spontaneous asymmetric crystallization of a quartz-type framework from achiral precursors

Abstract: An enantioenriched three-dimensional quartz-type framework {[Ni(1.5)(tzdc)(H(2)O)(3)]·3H(2)O}(n) (H(3)tzdc = 4H-1,2,4-triazole-3,5-dicarboxylic acid) possessing chiral channels is obtained through spontaneous asymmetric crystallization without any enantiopure additive.

Cited by 14 publications

References 30 publications

Chiral Metal-Oxide Nanofilms by Cellulose Template Using Atomic Layer Deposition Process

Chiral Metal-Oxide Nanofilms by Cellulose Template Using Atomic Layer Deposition Process

When Stereochemistry Raised Its Ugly Head in Coordination Chemistry—An Appreciation of Howard Flack

Viedma Ripening of Chiral Coordination Polymers Based on Achiral Molecules

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