密度関数理論は,キラル表面でのエナチオスペシフィック吸着の研究である

Zeljko Sljivancanin¹, Kurt V Gothelf, Bjørk Hammer

¹Interdisciplinary Nanoscience Center (iNANO), Institute of Physics and Astronomy, and Center for Catalysis, Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark.

Journal of the American Chemical Society

|December 6, 2002

まとめ

チラルの表面は,エナティオスペシフィック結合を示し,あるエナティオメアが他のエナティオメアよりも強く結合する. この選択的吸収は,キラル分子と表面の間の複数の局所結合の最適化から生じる.

科学分野:

表面科学とは,地表科学のことである.
計算化学はコンピュータ化学である.
チラリティ研究とは

背景:

チラルの分子は,重複できない鏡像 (エナティオマー) として存在します.
エナチオセレクティブ相互作用は,化学と生物学において極めて重要です.
表面でのキラル分子吸収を理解することは,触媒と材料科学の鍵です.

研究の目的:

キラルゴールド表面上のキラル分子のエナチオスペシフィック吸収を調査する.
エナンティオメアの選択結合を左右する要因を決定する.
観察された吸附現象を説明するための局所結合モデルを開発する.

主な方法:

密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.
(S) -および (R) -エナンチオメアの吸附エネルギー計算
ローカル・バインディングモデルの開発と分析.

主要な成果:

HSCH2CHNH2CH2P ((CH3) 2) の (S) -エナティオメアは,Au ((17 11 9) 表面の (R) -エナティオメアよりも 8.8 kJ/mol 強く結合する.
エナチオスペシフィック結合は,表面キンクサイトのキラルな性質に起因する.
関連するキラル分子 (システイン,ダイアミン) は,同様の条件下ではエナチオスペシフィック結合を示さなかった.
ローカル・バインディング・モデルは,3つのコンタクト・ポイントの同時最適化をエナティオ・スペシフィシティの起源として強調している.
分子は結合を最適化するために著しい変形を経験しますが,表面の変形は少なくなります.

結論:

クイラルAu ((17 11 9) 表面は,特定のキラル分子に対するエナチオスペシフィック吸収を示しています.
Enantiospecificityは,複数の局所的な相互作用の協力的な最適化から生じる.
局所結合モデルは,キラル吸附現象を理解するための枠組みを提供します.

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