Multiple Charge-Transfer Emissions from Different Metal-Ligand Pairs in Ruthenium Diimines

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• 作者：Jos&eacute ; L. Zambrana ; Jr. ; Elena X. Ferloni ; Julie C. Colis ; Harry D. Gafney
• 刊名：Inorganic Chemistry
• 出版年：2008
• 出版时间：January 7, 2008
• 年：2008
• 卷：47
• 期：1
• 页码：2 - 4
• 全文大小：58K
• 年卷期：v.47,no.1(January 7, 2008)
• ISSN：1520-510X

文摘

Ruthenium diimines are unique in their emissivity. Optical excitationwith light of less than 500 nm leads to a strong emission in the600-700 nm range. All emissive ruthenium complexes appear toundergo intersystem crossing from the absorptive singlet metal-to-ligand charge-transfer (MLCT) state to an emissive triplet MLCTstate localized on the lowest-energy metal-ligand pair. In contrastto this currently accepted model, in which a single emissive stateis populated and then equilibrates among other states based ona particular set of conditions, the excitation-wavelength dependenceof the [(bpy)₂RudppH]³⁺ emission suggests two emissive pathways.One populates an emissive MLCT state localized on a bpy-Rupair, and the other populates a lower-energy MLCT state localizedon the dpp-Ru pair.