Ruthenium Complexes That Break the Rules: Structural Features Controlling Dual Emission
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- 作者：Edith C. Glazer ; Douglas Magde ; Yitzhak Tor
- 刊名：Journal of the American Chemical Society
- 出版年：2007
- 出版时间：July 11, 2007
- 年：2007
- 卷：129
- 期：27
- 页码：8544 - 8551
- 全文大小：211K
- 年卷期：v.129,no.27(July 11, 2007)
- ISSN：1520-5126
文摘
A family of heteroleptic RuII coordination complexes containing substituted 1,10-phenanthroline(phen) ligands with extended conjugation was found to exhibit two simultaneously emissive excited statesat room temperature in fluid solution. These systems demonstrate a breakdown of the standard nonradiativedecay pathways that normally lead to a single, dominant, lowest energy emissive excited state in RuIIcomplexes and most other chromophores. The structural requirements for dual emission were exploredthrough the synthesis and characterization of isomeric systems. Two features were found to be primarilyresponsible for resolvable dual emission. Extended conjugation at the 4-position of the 1,10-phenanthrolineligand was identified as an essential feature, and asymmetry in the phenanthroline ligand substitutionsappears to greatly facilitate the production of these two nonequilibrated emissive states. Additional complexeswere studied which displayed "tunable" emissive characteristics for the two excited states as a function ofcovalent and noncovalent modification.