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Long-wavelength long-lifetime luminophores.

B P Maliwal1, Z Gryczynski, J R Lakowicz

  • 1Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland at Baltimore, 21201, USA.

Analytical Chemistry
|September 25, 2001
PubMed
Summary

Researchers developed novel luminophores using resonance energy transfer (RET) between a ruthenium complex donor and Texas Red acceptor. This approach yields long-wavelength emission, extended decay times, and high quantum yields for diverse applications.

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ADVANCES IN FLUORESCENCE SPECTROSCOPY: MULTI-PHOTON EXCITATION, ENGINEERED PROTEINS, MODULATION SENSING AND MICROSECOND RHENIUM METAL-LIGAND COMPLEXES.

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Area of Science:

  • Photochemistry
  • Biophysical Chemistry
  • Materials Science

Background:

  • Metal-ligand complexes and organic dyes are widely used as luminophores.
  • Achieving long emission wavelengths, long decay times, and high quantum yields simultaneously in luminophores remains a challenge.
  • Resonance energy transfer (RET) is a mechanism for energy transfer between molecules.

Purpose of the Study:

  • To develop a new class of luminophores with tunable spectral properties, including long emission wavelengths, long decay times, and high quantum yields.
  • To demonstrate the utility of covalently linked donor-acceptor pairs for creating efficient luminophores.
  • To explore the potential applications of these novel luminophores in various scientific fields.

Main Methods:

  • Synthesized covalently linked donor-acceptor pairs using a ruthenium (Ru) metal-ligand complex as the donor and Texas Red as the acceptor.

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  • Employed polyproline spacers to control the distance between the donor and acceptor moieties.
  • Investigated the photophysical properties, including emission spectra, decay times, and quantum yields, of the synthesized luminophores.

    • Main Results:

    • The developed luminophores exhibited long emission wavelengths and significantly long decay times due to the long-lifetime donor facilitating RET.
    • The quantum yields of the tandem luminophores approached that of the acceptor, overcoming the typical limitations of metal-ligand complexes.
    • Emission maxima and decay times were tunable by altering the donor, acceptor, and the distance between them.

    Conclusions:

    • Covalently linking long-lifetime donors with long-wavelength acceptors via spacers provides a versatile strategy for creating high-performance luminophores.
    • These novel luminophores offer adjustable spectral properties and high quantum yields, making them suitable for advanced applications.
    • The described approach opens possibilities for designing luminophores that can be activated by biochemical association reactions for targeted applications.