Synthesis and Properties of Tetrasubstituted 1,10-Phenanthrolines and Their Ruthenium Complexes

✍ Scribed by Bernhard Schäfer; Helmar Görls; Susann Meyer; William Henry; Johannes G. Vos; Sven Rau

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 158 KB
• Volume: 2007
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200600933

✦ Synopsis

Abstract

The synthesis and the photophysical properties of a series of tetrasubstituted phenanthroline (phen) ruthenium complexes of the type [Ru(tbbpy)~2~(phen‐R~4~)]^2+^ (tbbpy = 4,4′‐di‐tert‐butyl‐2,2′‐bipyridine; phen = 1,10‐phenanthroline; R represents the substitution at 3‐, 5‐, 6‐ and 8‐positions with phenyl, 4‐tert‐butylphenyl and para‐biphenyl) and of a homoleptic [Ru(phen‐R′~4~)~3~]^2+^ (R′ = 4‐tert‐butylphenyl) are described. The phen‐R~4~ ligands were obtained in high yields usingSuzuki‐type coupling reactions. The solid‐state structure of 3,5,6,8‐tetraphenylphenanthroline is reported. The investigation of the photophysical properties of the free ligands reveals a pronounced effect of the aryl substitution on absorption and emission properties. These properties are mirrored in the corresponding complexes, which possess room‐temperature emission lifetimes of up to 2833 ns.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)