Photophysical properties and excitation polarization of fac/mer-ruthenium complexes with 5'-amino-2,2'-bipyridine-5-carboxylic acid derivatives

Inorganic Chemistry
Masato KyakunoHitoshi Ishida

Abstract

Novel ruthenium(II) complexes, fac/mer-[Ru(MeCO-5Bpy-R)3]2+ (H-5Bpy-OH = 5'-amino-2,2'-bipyridine-5-carboxylic acid; R = -NHtBu, -NH(cHex), -N(cHex)2), have been synthesized. The fac and mer isomers have been successfully separated using HPLC techniques, and their photophysical/electrochemical properties have been investigated. In the absorption and emission spectra of fac/mer-[Ru(MeCO-5Bpy-R)3]2+ with secondary amines (R = -N(cHex)2) in acetonitrile at room temperature, the maximum wavelengths based on the MLCT are longer than those for the amide derivatives with primary amines (R = -NHtBu, -NH(cHex)). A small solvent effect on the photophysical properties between fac- and mer-[Ru(MeCO-5Bpy-NHtBu)3]2+ has been observed. The excitation polarization spectra, giving P values reflecting the relation between the absorption and the emission oscillators, for the fac- and mer-ruthenium(II) complexes (C3 and C1 symmetry, respectively) have been measured for the first time. Almost no difference in the excitation polarization spectra between the fac and mer complexes is found, and these spectra are similar to that for [Ru(bpy)3]2+ with D3 symmetry. This finding suggests that the orientations of the absorption and emission oscillators, in...Continue Reading

References

Dec 13, 1996·The Journal of Organic Chemistry·Alicia Torrado, Barbara Imperiali
May 2, 1997·The Journal of Organic Chemistry·George R. NewkomeAnil K. Patri
Aug 9, 2002·Journal of the American Chemical Society·Takaki KoideHiroyuki Konno

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Citations

Jan 21, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Serin L Dabb, Nicholas C Fletcher
Aug 18, 2006·Chembiochem : a European Journal of Chemical Biology·Hitoshi IshidaShigero Oishi
Jul 15, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Gareth CookeSylvia M Draper
Aug 15, 2013·Chemistry : a European Journal·Ilaria GambaM Eugenio Vázquez
Dec 25, 2012·Chemical Communications : Chem Comm·Alexandrina SchrammMarcel Mayor
May 5, 2012·Chemistry : a European Journal·Gustavo RamaMiguel Vázquez López
Dec 7, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Leila MotieiMilko E van der Boom

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