Changing the Role of 2,2′-Bipyridine from Secondary Ligand to Protagonist in [Ru(bpy)2(N−N)]2+ Complexes: Low-Energy, Red Emission from a Ruthenium(II)-to-2,2′-Bipyridine 3MLCT State
Two new bidentate ligands (1 and 2) with bicyclic guanidine moieties were synthesized and attached to a RuII(bpy)2 core (bpy = 2,2′-bipyridine) to afford complexes 3 and 4, which were characterized by spectroscopic and electrochemical methods. Complex 4 was further characterized by X-ray crystallogr...
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Published in | Inorganic chemistry Vol. 50; no. 1; pp. 7 - 9 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Chemical Society
03.01.2011
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Online Access | Get full text |
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Summary: | Two new bidentate ligands (1 and 2) with bicyclic guanidine moieties were synthesized and attached to a RuII(bpy)2 core (bpy = 2,2′-bipyridine) to afford complexes 3 and 4, which were characterized by spectroscopic and electrochemical methods. Complex 4 was further characterized by X-ray crystallography. In cyclic voltammetric studies, both complexes show a RuII/III couple, which is 500 mV less positive than the RuII/III couple of Ru(bpy)3 2+. The 1MLCT and 3MLCT states of 3 (560 nm/745 nm) and 4 (550 nm/740 nm) are significantly red-shifted with respect to Ru(bpy)3 2+ (440 nm/620 nm). Compounds 3 and 4 exhibit emission from a RuII-to-bpy 3MLCT state, which is rarely the emitting state at λ > 700 nm in [Ru(bpy)2(N−N)]2+ complexes. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0020-1669 1520-510X |
DOI: | 10.1021/ic101986a |