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Proceedings Paper

Long-lifetime and long-wavelength osmium (II) metal complexes containing polypyridine ligands: excellent red fluorescent dyes for biophysics and for sensors
Author(s): Zakir Murtaza; Joseph R. Lakowicz
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Paper Abstract

Several luminescent complexes of osmium (II) containing polypyridine ligands have been prepared. The syntheses, photophysical and fluorescence polarization properties of [Os(phen)2(aphen)]2+, [Os(tpy)(mcbpy)(py)]2+, [Os(ttpy)2]2+, [Os(tpy)(triphos)]2+ and [Os(tppz)2]2+ are reported. Where phen is 1,10-phenanthroline, aphen is 5-amino-1,10-phenanthroline, tpy is 2,2':6,2'-terpyridine, mcbpy is 4-methyl-2,2'- bipyridine-4'-carboxylic, py is pyridine, triphos is bis(2-diphenylphosphinoethyl)-phenyl phosphine, ttpy is 4- tolyl,2,2':6,2'-terpyridine, and tppz is 2,3,5,6- tetrakis(2-pyridyl)pyrazine. The complexes absorb light at above 550 nm, emit above 700 nm, and have emission lifetimes longer than 50 ns in water. The emission of all the complexes is polarized, so they can have applications as red light excitable dyes for biophysical studies of macromolecules and for polarization immunoassays. The complexes can also be used for lifetime-based oxygen sensing using low-cost phase fluorometry and a LED light source.

Paper Details

Date Published: 3 May 1999
PDF: 7 pages
Proc. SPIE 3602, Advances in Fluorescence Sensing Technology IV, (3 May 1999); doi: 10.1117/12.347549
Show Author Affiliations
Zakir Murtaza, Univ. of Maryland School of Medicine/Baltimore (United States)
Joseph R. Lakowicz, Univ. of Maryland School of Medicine/Baltimore (United States)

Published in SPIE Proceedings Vol. 3602:
Advances in Fluorescence Sensing Technology IV
Joseph R. Lakowicz; Steven A. Soper; Richard B. Thompson, Editor(s)

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