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Synthesis and Photophysical Properties of New 2,2′‐Bipyridine‐Bridged Bis[ruthenium(II)tris‐2,2′‐bipyridine] Complexes
Author(s) -
König Burkhard,
Zieg Harald,
Cola Luisa De,
Balzani Vincenzo,
Nimtz Manfred,
Balzani Vincenzo
Publication year - 1997
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19971300413
Subject(s) - chemistry , ruthenium , 2,2' bipyridine , bipyridine , ligand (biochemistry) , tris , excited state , electrochemistry , 4,4' bipyridine , stereochemistry , medicinal chemistry , photochemistry , crystallography , molecule , crystal structure , organic chemistry , catalysis , electrode , hydrogen bond , biochemistry , physics , receptor , nuclear physics
We have synthesized a new type of tris‐2,2'‐bipyridine ligand with 4,4'‐ and 6,6'‐disubstituted 2,2'‐bipyridine (bpy) units. The terminal 4,4'‐and 6,6'‐disubstituted 2,2'‐bipyridine moieties are selectively coordinated by Ru(bpy) 2 (bpy = 2,2′‐bipyridine), whereas the central 2,2′‐bipyridine ligand does not participate in any metal ion coordination. The two Ru(bpy) 3 units of 7 and 8 do not interact appreciably, as is evident from their electrochemical and photophysical data. The lifetime of the excited state of compound 7 at 77 K is similar to that of Ru(bpy) 2 (4,4′‐dimethyl‐2,2′‐bipyridine), whereas that of compound 8 under the same conditions is comparatively long.