固体 (63) Cuおよび (65) Cuの無機および有機金属銅 (((I) 複合体の固体 (63) Cuおよび (65) CuのNMRスペクトロスコーピー
Joel A Tang1, Bobby D Ellis, Timothy H Warren
1Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4.
Journal of the American Chemical Society
|October 11, 2007
まとめ
固体銅-63/65核磁気共振 (NMR) は,電場グラデーションが銅 (I) 複合体にどのように影響するかを明らかにしています. この研究では,四極結合定数と化学遮断アニソトロピーを様々な調整環境で特徴づけています.
科学分野:
- 固体無機および有機金属化学.
- 核磁共振 (NMR) スペクトロスコーピー. 核磁共振 (NMR) スペクトロスコーピー. 核磁共振 (NMR) スペクトロスコーピー.
- 量子化学とコンピューティングモデリング.
背景:
- 銅 ((I) 複合体は,様々な協調幾何学を示している.
- 電場グラデーション (EFG) は,四極核のNMRスペクトルに大きく影響します.
- 分子構造とNMRパラメータの関係を理解することは極めて重要です.
研究 の 目的:
- 各種銅 ((I) 調整環境における63Cuと65Cuの固体NMRを調査する.
- 構造的変化と対称性を電場梯度 (EFG) テンソールと相関させるため.
- 四極結合定数 (CQ) と非対称な銅部位に対する化学シールドアニゾトロピー (CSA) を決定する.
主な方法:
- ハーン・エコーとQCPMGパルス配列を用いた固体63Cuと65CuのNMR実験.
- 高信号からノイズへの粉末パターンの周波数段階的取得.
- 31Pクロス・ポラライゼーション・マジック・アングル・スピニング (CP/MAS) Cu-PスピンペアのためのNMR.
- X線結晶学と理論的計算 (ハートリー・フォック,DFT).
主要な成果:
- 観察されたCQ値は,非対称なCuサイトで22.0から71.0MHzの範囲です.
- Spectraは,大きな四極の相互作用により,広範な中央移行パターン (760 kHzから6.7 MHz) を示した.
- 重要なCSA (1000〜1500ppm) は,いくつかの複合体で検出されました.
- NMRデータは,結晶学と理論と組み合わせて,EFGテンソール方向とCQサインの決定を可能にしました.
結論:
- 固体NMRは,様々な銅の調整環境を特徴付けるのに有効です.
- NMR相互作用テンソールパラメータは,分子構造と対称性と直接関係しています.
- この研究は,詳細なNMR分析を通じて,銅 (I) 複合体の電子構造についての洞察を提供します.
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