分子棒のキラル組織を分子設計によってAu(111) 上に制御する
Martin M Knudsen1, Nataliya Kalashnyk, Federico Masini
1Danish National Research Foundation: Center for DNA Nanotechnology (CDNA), Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark.
Journal of the American Chemical Society
|March 16, 2011
まとめ
研究者は,表面上の特定のパターンに自己組み立てられるキラル分子を設計しました. この突破は,触媒と生命の起源の理解に不可欠なキラル組織を制御することを可能にします.
科学分野:
- 表面科学とは,地表科学のことである.
- 超分子化学とは
- オーガニック・ケミストリー オーガニック・ケミストリー
背景:
- キラルの自己組み立て構造は,触媒とホモキラリティの理解に不可欠です.
- アキラル分子に関する以前の研究では,対称的な風車パターンが示されました.
- アキラル分子は,対極的に指向した構造の等しい比率をもたらした.
研究 の 目的:
- 表面の自己組み立てのためのキラル分子のエナチオセレクティブ合成を達成するために.
- 分子キラリティの超分子構造への移転を調査する.
- 合理的な分子設計を通じて表面のキラル組織を制御する.
主な方法:
- キラル分子のエナチオセレクティブ化学合成.
- 超高真空条件下でのスキャニングトンネル顕微鏡 (STM).
- 高解像度のSTM画像の統計分析.
主要な成果:
- (S) -sec-ブチル置換剤を併用したキラル分子が合成されました.
- キラル分子は,以前のアキラル化合物と同様の構造を形成した.
- 1つの風車モチーフの指向に対する強い好みが観察され,キラル制御が示されました.
結論:
- 合理的な分子設計は,自己組み立てられた表面構造におけるキラル組織を制御することができます.
- キラル置換剤の導入は,実質的に超分子キラル性を決定する.
- この研究は,潜在的なアプリケーションのために,エナチオセレクティブ表面組立を進歩させる.
関連する概念動画
02:05Prochirality
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
02:30Chirality in Nature
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid. The...
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
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...
02:25Molecules with Multiple Chiral Centers
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...
02:25Chirality
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...
02:18Fischer Projections
Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...