新しいRh2(II,II) 太陽エネルギーアプリケーションのための複合体:パンクロマティック吸収と興奮状態の反応性
Tyler J Whittemore1, Hannah J Sayre1, Congcong Xue1
1Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210, United States.
Journal of the American Chemical Society
|October 5, 2017
まとめ
新しいロジウムパドルホイール複合体は,強い紫外線可視光吸収を示し,太陽エネルギー変換および光触媒のアプリケーションのための有望な染料となっています.
科学分野:
- 無機化学
- 材料科学
- 写真化学
背景:
- パドルホイール複合体は 独特の電子と光物理的性質で知られています
- 特にロジウム複合体は,その触媒および光採集能力のために関心を集めている.
- 太陽エネルギー変換のための新しい材料を開発するには,調節可能な性質を持つ効率的な光吸収器が必要です.
研究 の 目的:
- 新しいヘテロレプティックなパドルホイールロジウム複合体を合成し,特徴づけること.
- これらの複合体の光物理学的および電気化学的性質を調査する.
- 太陽エネルギー変換と光触媒の染料としての可能性を評価する.
主な方法:
- cis-[Rh2(μ-form) 2(μ-np) 2[BF4]2およびcis-Rh2(μ-form) 2(μ-npCOO) 2複合体の合成と特徴付け
- UV-Visの吸収スペクトロスコーピーは,光の吸収プロフィールを決定します.
- 超高速およびナノ秒間断吸収および時間解像度の赤外線スペクトロスコピーは,興奮状態のダイナミクスを研究します.
- 三重興奮状態のエネルギーを推定するエネルギー移転 quenching 実験.
- レドックスポテンシャルを決定する電気化学的方法.
主要な成果:
- 4つの新しいヘテロレプティックなパドルホイールロジウム複合体が成功して合成され,特徴づけられました.
- 複合体は,UVから可視領域 (最大640 nm) への強力なパンクロマティック光吸収を示します.
- シングレットおよびトリプレット金属/リガンド対リガンド電荷移転 (ML-LCT) の興奮状態が観察されました.
- npCOO-複合体は近赤外線に赤色シフト吸収を示し,光誘発電子移転を経験する.
- 三重興奮状態のエネルギーは1.83から0.78 eVの範囲で,決定された酸化還元電位を持つ.
結論:
- これらの新しいロジウム複合体は,新しいクラスの光吸収体を表しています.
- 幅広い吸収と好ましい興奮状態の特性により,太陽エネルギーアプリケーションに適しています.
- 潜在的用途には,太陽電池に電荷を注入するための染料と,光触媒における感受剤が含まれます.
- 複合体は,UVから約800nmまでの照射で効果的に動作します.
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