DNA dynamics by using highly luminescent phosphine complex of osmium (II)

Zakir Murtaza; Henryk M. Malak; Joseph R. Lakowicz

doi:10.1117/12.347550

3 May 1999 DNA dynamics by using highly luminescent phosphine complex of osmium (II)

Zakir Murtaza, Henryk M. Malak, Joseph R. Lakowicz

Proceedings Volume 3602, Advances in Fluorescence Sensing Technology IV; (1999) https://doi.org/10.1117/12.347550
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

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.

Citation Download Citation

Zakir Murtaza, Henryk M. Malak, and Joseph R. Lakowicz "DNA dynamics by using highly luminescent phosphine complex of osmium (II)", Proc. SPIE 3602, Advances in Fluorescence Sensing Technology IV, (3 May 1999); https://doi.org/10.1117/12.347550

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