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Proceedings Paper

DNA dynamics by using highly luminescent phosphine complex of osmium (II)
Author(s): Zakir Murtaza; Henryk M. Malak; Joseph R. Lakowicz
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Paper Abstract

A new highly luminescent 'molecular light switch' has been prepared using osmium (II) metal and nonchromophoric phosphine (dppe) and chromophoric (dppz) ligands to study the dynamics of DNA, where dppe is cis-1,2-bis(diphenylphosphino)-ethylene and dppz is dipyrido[3,2-a:2',3'-c]phenazine. The complex, [Os(dppe)2(dppz)]2+, shows a quantum yield in acetonitrile about twofold larger than analogous ruthenium compound, [Ru(bpy)2(dppz)]2+. The anisotropy of [Os(dppe)2(dppz)]2+ was found to be near 0.2 at -60 degrees Celsius in glycerol. This compound emits at 610 nm on exciting at metal to ligand charge transfer (MLCT) band (390 nm). The lifetimes are 550 and 315 ns in argon and air equilibrated acetonitrile samples respectively. This new class of fluorophore using MLCT complex is useable for measurement of DNA dynamics over a larger time scales, which is not possible with conventional DNA dyes, such as ethidium bromide or acridine derivatives.

Paper Details

Date Published: 3 May 1999
PDF: 10 pages
Proc. SPIE 3602, Advances in Fluorescence Sensing Technology IV, (3 May 1999); doi: 10.1117/12.347550
Show Author Affiliations
Zakir Murtaza, Univ. of Maryland School of Medicine/Baltimore and FluorRx Inc. (United States)
Henryk M. Malak, 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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