シリコンを含む種の電子,ヒドリド,およびフッ化物の相性: 計算的研究
Robert Damrauer1, April J Crowell, Colleen F Craig
1Chemistry Department, University of Colorado at Denver, Denver, CO 80217-3364, USA. robert.damrauer@cudenver.edu
Journal of the American Chemical Society
|August 28, 2003
まとめ
シリコンの置換は,炭素基の電子相性 (EA) に著しく影響する. EAsは短い距離では大きいが,シリコンを含むアニオンがペンタコーディネート構造にサイクルするにつれて急速に減少する.
科学分野:
- コンピューティング・ケミストリー
- 量子化学とは,量子化学である.
- 有機シリコン化学 有機シリコン化学
背景:
- 電子相性 (EA) を理解することは,化学反応性と安定性を予測するために極めて重要です.
- 有機基の特性に対するシリコン置換効果は,特に電子結合に関して,十分に理解されていません.
- 以前の研究では,シリコンの影響を調査しましたが,サイクリングなどの特定の構造変化の影響については,さらなる調査が必要です.
研究 の 目的:
- 炭素基の電子親和性に対するシリコン置換の距離依存の影響を調査する.
- シリコン含有アニオンの構造変容,特にペンタコーディネーションとそのEAへの影響を分析する.
- 計算方法の検証は,計算されたEA値を,関連する種の実験データと比較することによって行う.
主な方法:
- SiH3(CH2) nCH2およびSiH2F(CH2) nCH2システムにおける電子親和性を研究するために,計算化学の方法を使用しました.
- 異なる鎖長 (n) の電子相性および垂直結合エネルギーを計算した.
- 三角二ピラミッド形状の三角形二ピラミッド形状のペンタコーディネートシリコンアニオンの形成を含む幾何学的変化を分析した.
主要な成果:
- 電子の親和性は,n=0のとき,両方の研究システムで大きいことが判明しました.
- n > 1の場合,アニオンは,ペンタコーディネートシリコン構造にサイクリングされ,EA.を大幅に変化させました.
- 非サイクルアニオンと垂直結合エネルギーの計算されたEAは,n > 1のEAの急速な衰弱を示し,メチル基 (CH3) に近い.
結論:
- シリコンの置換は,炭素根の電子相性に影響を及ぼし,その影響は距離に依存する.
- シリコンアニオンにおけるペンタコーディネーションは,EAの解釈を複雑にする深い幾何学的な変化につながります.
- 実験データで検証された計算アプローチは,EA値は,n=1.1を超える鎖の長さの増加とともに急速に減少することを明らかにします.
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