結合オリゴマーの固体包装:パイスタックからヘーリングボーン構造まで
M David Curtis1, Jie Cao, Jeff W Kampf
1Department of Chemistry, and the Macromolecular Science and Engineering Program, The University of Michigan, Ann Arbor, Michigan, USA. mdcurtis@umich.edu
Journal of the American Chemical Society
|April 1, 2004
まとめ
ビチアゾール,チオフェン,ペンタゼンなどの有機半導体における分子包装は",ピッチ・アンド・ロール"運動によって説明される. 大規模なロール歪みは,負荷輸送に不可欠な pi-pi 相互作用を妨げます.
科学分野:
- マテリアルサイエンス 材料科学
- 固体化学 固体化学
- オーガニック・エレクトロニクス
背景:
- オーガニック半導体の分子パッキングを理解することは,電子特性を最適化するために不可欠です.
- 以前のモデルは,固体構造の分子における複雑な3次元の配列をしばしば簡素化している.
- ビチアゾールとチオフェンのオリゴーマーと代替ペンタセンは,有機電子学の重要な材料です.
研究 の 目的:
- ビチアゾール,チオフェンオリゴーマー,および代替ペンタセンの固体構造を合理化するために.
- 理想的なコファシアルパイスタックからの"ピッチ・アンド・ロール"の傾きを使用して分子包装を定義し,分析する.
- 分子パッキングの歪みを分子間PI-PI相互作用と潜在的電荷輸送特性と相関させるため.
主な方法:
- 結晶学データを用いて固体構造の分析.
- "ピッチ" (長い軸に沿って) と"ロール" (短い軸に沿って) の角度で分子移動の定量化.
- 有機半導体の異なるクラスにおけるパッケージングモチーフの比較.
主要な成果:
- ピッチとロールの傾きは,理想的なコファシアルパイスタッキングからの偏差を記述するための枠組みを提供します.
- 適度なピッチの歪みはpi-piの相互作用を維持し,2.5 Åを超えるロールの歪みはpiの重複を妨げます.
- チオフェンは大きなロール変換,チアゾールは小さなロール,大きなピッチ変換,ペンタセンは中程度のピッチとロールを発揮します.
結論:
- "ピッチ・アンド・ロール"モデルは,有機半導体における多様な包装装置を効果的に合理化します.
- ヘリングボーン包装は,大きなロール歪みによって特徴付けられています.
- 分子パッキングの歪みの程度は,分子間相互作用に直接影響し,電荷輸送特性の重要な要因である.
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