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Synthesis and Photophysical Properties of New 2,2′-Bipyridine-Bridged Bis[ruthenium(II)tris-2,2′-bipyridine] Complexes

✍ Scribed by König, Burkhard ;Zieg, Harald ;Cola, Luisa De ;Balzani, Vincenzo ;Nimtz, Manfred ;Balzani, Vincenzo

Publisher
Wiley (John Wiley & Sons)
Year
1997
Tongue
English
Weight
500 KB
Volume
130
Category
Article
ISSN
0009-2940

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✦ Synopsis

We have synthesized a new type of tris-2,2'-bipyridine ligand of 7 and 8 do not interact appreciably, as is evident from their with 4,4'-and 6,6'-disubstituted 2,2'-bipyridine (bpy) units. electrochemical and photophysical data. The lifetime of the The terminal 4,4'-disubstituted 2,2'-bipyridine moieties are excited state of compound 7 at 77 K is similar to that of selectively coordinated by Ru( bpy) (bpy = 2,2 'bipyridine) , Ru (bpy) ,(4,4 ' -dimethyl-2,2 ' -bip yridine) , whereas that of whereas the central 2,2'-bipyridine ligand does not partici-compound 8 under the same conditions is comparatively pate in any metdl ion coordination. The two Ru(bpy), units long.

Multimetallic assemblies of defined structure are key design targets for the study of energy-and electron transfer [']. Ruthenium complexes of polypyridinc ligands play a central properties, and favorable photophysical characteristicsr21. Most di-and oligonuclear ruthenium complexes have been synthesized by metal complexation of a multitopic ligandIsl. This procedure does not always provide full control over the final composition of the oligonuclear ~ornplex[~J. The selective synthesis of assemblies with free binding sites is especially ditficult. We report here on the preparation of new tris-2,2'-bipyridine ligands with different binding sites and their selective twofold coordination by R ~( b p y ) ~ [ ~] moieties. The redox, absorption, and luminescence properties of the 2,2'-bipyridine-bridged bis(ruthenium) complexes thus obtained have been investigated.

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