Papkovsky, Dmitri B. and Ponomarev, Gelii V. and Wolfbeis, Otto S. (1996) Longwave luminescent porphyrin probes. Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 52 (12), pp. 1629-1638.
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A set of luminescent dyes, namely the porphyrin-ketones and their zinc(II), platinum(II) and palladium(II) complexes, are described. The probes are derived from a partially oxidized porphyrin ring and have been studied by absorption and luminescence spectroscopy including time-resolved measurements. The metal-free porphyrin-ketones display strong and pH-dependent fluorescence due to a protolytic equilibrium that exists between the free base and the dication. The zinc(II) complexes also give strong fluorescence along with a weak long-decay emission at room temperature which are attributed to delayed fluorescence and phosphorescence, respectively. Platinum(II) and palladium(II) complexes exhibit room-temperature phosphorescence without any detectable fluorescence. Compared to existing porphyrins, the new dyes display a considerably longwave-shifted luminescence along with substantially improved (photo)chemical stability. They are considered to be promising probes for very near-infrared luminescence studies, and to be particularly useful for applications such as labelling of biomolecules, pH-sensing, and detection of quenching species such as molecular oxygen.
|Institutions:||Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Otto S. Wolfbeis)|
|Keywords:||Fluorescence; Luminescent probes; NIR dyes; Phosphorescence; Porphyrins|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||19 Jul 2011 07:37|
|Last Modified:||21 Jul 2011 02:16|