Synthesis of, Characterization of, and Photoinduced Processes in Polymetallic Triad Complexes Containing Fe(II), Ru(II), and Rh(III) Metal Centers
| Autor: | Silvia Ronco, John D. Petersen, David W. Thompson, Sean L. Gahan |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
chemistry.chemical_classification
Pyrazine Absorption spectroscopy Chemistry Electron donor Electron acceptor Photochemistry Redox Inorganic Chemistry Metal chemistry.chemical_compound Crystallography Electron transfer visual_art visual_art.visual_art_medium Moiety Physical and Theoretical Chemistry |
| Zdroj: | Inorganic Chemistry. 37:2020-2027 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/ic970270r |
| Popis: | A series of new trimetallic mixed complexes containing Fe(II), Ru(II), and Rh(III) metal centers have been prepared and characterized, and their excited-state properties in a nanosecond time domain have been investigated. These new compounds were synthesized by following a building block strategy from monomeric Rh(III) and Ru(II) polyazines and tetracyanoferrate(II) ions. The products generated in each synthetic step were fully characterized and their excited-state properties investigated. These new trimetallic complexes, [(CN){sub 4}Fe{sup II}(BL(1))Ru{sup II}(bpy)-(BL(2))Rh{sup III}(tpy)(MQ{sup +})](PF{sub 6}){sub 4} (tpy = 2,2{prime}:6{prime}:2{double_prime}-terpyridine; BL(1) = 2,3-bis(2-pyridyl)pyrazine (dpp) or 2,2{prime}-bipyrimidine (bpm); BL(2) = dpp or bpm; MQ{sup +} = N-methyl-4,4{prime}-bipyridinium (monoquat)), consist of three fundamental parts linked by bridging ligands (1) an electron donor group, the tetracyanoferrate(II) unit; (2) an antenna fragment, the Ru(II) polypyridyl moiety; and (3) an electron acceptor group. The electron acceptor group is a Rh(III) polypyridyl that contains the ligands tpy and MQ{sup +}. No emission was observed in any of the reported complexes either in fluid solutions at room temperature or in glassy solutions at 77 K. Time-resolved experiments conducted on these triads showed formation of a transient intermediate within the laser pulse. Redox properties and transient absorption observations helped the authors to identify the nature of thismore » intermediate as an Fe(III)/Ru(II) mixed-valence species that decays exponentially by following a first-order law with a lifetime of {tau} {le} 70 ns in fluid solution at room temperature.« less |
| Databáze: | OpenAIRE |
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