Abstract
The measured quantum yield of Yb-2,4-dimethoxyhematoporphyrin (Yb-DMHP) in DMSO was 0.8%. It was found that molecular oxygen did not quench luminescence of the metal ion in Yb-DMHP, which was a diagnostic advantage while using this complex in practice. The kinetic characteristics of IR luminescence of the Yb porphyrin complex in DMSO/H2O mixtures were measured. The average lifetime of Yb 3+ ( 2 F5/2) in DMSO was 9.7 ȝ s, which was an order of magnitude greater than that of the auto-fl uorescence of biological tissues. Water molecules quenched effectively IR luminescence of Yb-DMHP. The integrated luminescence intensity of Yb 3+ ( 2 F5/2) depended non-linearly on the fraction of H2O in the DMSO/H2O mixtures. This was indicative of a complex quenching mechanism of Yb luminescence by surrounding molecules.
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