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Photo-isomerisation, Triplet Formation, and Photo-degradation Dynamics of Indocyanine Green Solutions by H. Gratz; A. Penzkofer; C. Abels; R.-M. Szeimies; M. Landthaler; W. Bäumler is a Materials Science article available to read on EtoBox.

What is Photo-isomerisation, Triplet Formation, and Photo-degradation Dynamics of Indocyanine Green Solutions about?

Indocyanine green sodium iodide (ICG-NaI) in dimethylsulfoxide (DMSO), methanol, water, and human plasma is excited with a chopped powerful diode laser at 812.5 nm (time resolution 20 s). Small transmission changes observed are analysed in terms of triplet formation, photo-isomerisation, photo-degradation, and thermal heating. Quantum yields of P-isomer formation and T 1 -triplet formation as well as P-isomer and T 1 -triplet lifetimes are determined. For nitrogen-bubbled ICG-NaI in DMSO a quantum yield of triplet formation of φ T ≈ 5 × 10 -5 and a triplet-state lifetime of τ T ≈ 700 s are determined. For ICG-NaI in methanol a quantum yield of P-isomer formation of φ P ≈ 2.4 × 10 -4 and a P-isomer lifetime of t P ≈ 430 s are obtained.

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Author

H. Gratz; A. Penzkofer; C. Abels; R.-M. Szeimies; M. Landthaler; W. Bäumler

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1010-6030)

Published

1999

Language

EN

Field

Materials Science (Physical Sciences)