Related Experiment Video
Updated: Jul 20, 2025
10:37
Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
9.0K
Spin-Based Chiral Separations and the Importance of Molecule-Solvent Interactions
Yiyang Lu1, Tian Qiu2, Brian P Bloom1
1Chemistry Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States.
Summary
This study reveals that chiral molecule adsorption kinetics depend on adsorbate charge and geometry, not thermodynamics. An applied magnetic field influences this preference through adsorbate-solvent interactions.
Area of Science:
- Surface science
- Electrochemistry
- Chirality studies
Background:
- Enantioselective adsorption is crucial for chiral separations and asymmetric synthesis.
- Understanding the factors governing enantiospecificity on surfaces is key to designing efficient chiral technologies.
Purpose of the Study:
- To investigate the enantiospecific adsorption of chiral molecules on a ferromagnetic substrate.
- To elucidate the kinetic and thermodynamic contributions to enantiospecificity under varying conditions.
- To explore the role of magnetic fields and adsorbate-solvent interactions in chiral recognition.
Main Methods:
- Magneto-electrochemical quartz crystal microbalance (QCM) was employed to monitor adsorption.
- Solution conditions, pH, and solvent isotope composition were systematically varied.
- Density functional theory (DFT) calculations were performed to model interactions.
Main Results:
- Adsorption kinetics were found to be highly dependent on adsorbate charge state and geometry.
- No thermodynamic contributions to enantiospecificity were observed.
- DFT calculations highlighted the importance of adsorbate-solvent interplay in magnetic field-induced enantiospecific preference.
Conclusions:
- The kinetics, not thermodynamics, govern enantiospecific adsorption under the studied conditions.
- Magnetic fields can influence chiral recognition through adsorbate-solvent interactions.
- Further research is needed to clarify the role of intermolecular vibrational couplings.
Related Concept Videos
02:30Racemic Mixtures and the Resolution of Enantiomers
18.5K
A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
18.5K
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
5.8K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
5.8K
01:08Size-Exclusion Chromatography
646
In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
Silica particles offer advantages such as rigidity,...
646
01:10Chromatography: Introduction
4.4K
Chromatography is a technique used to separate compounds based on differences of partitioning between two phases, the stationary phase and the mobile phase.
The phase in which the compounds linger or on which the compounds adsorb is called the stationary phase, whereas the mobile phase is the solvent that carries the solutes to be analyzed. In traditional column chromatography, the mixture flows through the stationary phase, and the compounds partition between the stationary and mobile phases...
The phase in which the compounds linger or on which the compounds adsorb is called the stationary phase, whereas the mobile phase is the solvent that carries the solutes to be analyzed. In traditional column chromatography, the mixture flows through the stationary phase, and the compounds partition between the stationary and mobile phases...
4.4K
02:25Molecules with Multiple Chiral Centers
11.8K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
11.8K
02:25Chirality
24.4K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
24.4K