Determination of the phosphorescence quantum yield of singlet molecular oxygen (1.DELTA.g) in five different solvents

1989 ◽  
Vol 93 (11) ◽  
pp. 4507-4511 ◽  
Author(s):  
R. Schmidt ◽  
K. Seikel ◽  
H. D. Brauer
Keyword(s):  
Quantum Yield ◽  
Molecular Oxygen ◽  
Singlet Molecular Oxygen ◽  
Phosphorescence Quantum Yield

Determination of the phosphorescence quantum yield of singlet molecular oxygen (1Δg) in benzene

1987 ◽  
Vol 138 (1) ◽  
pp. 18-22 ◽  
Author(s):  
R. Schmidt ◽  
H.-D. Brauer ◽  
K.H. Drexhage
Keyword(s):  
Quantum Yield ◽  
Molecular Oxygen ◽  
Singlet Molecular Oxygen ◽  
Phosphorescence Quantum Yield

PDT-related photophysical properties of conformationally distorted palladium(II) porphyrins

2001 ◽  
Vol 05 (12) ◽  
pp. 853-860 ◽  
Author(s):  
A. WIEHE ◽  
H. STOLLBERG ◽  
S. RUNGE ◽  
A. PAUL ◽  
M. O. SENGE ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Molecular Oxygen ◽  
Photophysical Properties ◽  
Bathochromic Shift ◽  
Luminescence Spectroscopy ◽  
Quantum Yields ◽  
Triplet States ◽  
Singlet Molecular Oxygen ◽  
Time Resolved ◽  
Phosphorescence Quantum Yield

The photodynamic therapy (PDT) related photophysical properties of five palladium(II) porphyrins with increasing steric demand of the meso-substituents were investigated by steady state and time-resolved absorption and luminescence spectroscopy. The steric strain of the meso-substituents is reflected in a bathochromic shift of the B-band in the absorption spectra. In contrast to free-base porphyrins, the palladium(II) complexes exhibit only a very weak fluorescence with Φ Fl ~ 10-4. Instead, the corresponding triplet states of the porphyrins are formed via inter system crossing (ISC) with a quantum yield ΦISC of nearly unity. A phosphorescence quantum yield ΦISC of 10-4 was determined assuming dynamic quenching. The triplet state of all compounds is efficiently quenched by molecular oxygen, generating singlet molecular oxygen with a quantum yield of ΦΔ ~ 0.85. The various substitution patterns exerted no significant influence on the ISC rates or singlet oxygen quantum yields. Significant differences, on the other hand, were observed with respect to the triplet lifetimes, with a tendency of longer lifetimes for the porphyrins with sterically more demanding substituents (in air-saturated solution). All porphyrins were successfully incorporated into liposomes. The phototoxic activity of three compounds was investigated in cell suspensions. The use of the new porphyrinato-palladium(II) in PDT applications is discussed.

Autosensitized Photooxidation of the Rose Hip (Wild Rose) Oil - Mechanism and Quantum Yield for Singlet Molecular Oxygen O2 (1 Δg) Generation

Lipid / Fett ◽  
1994 ◽  
Vol 96 (2) ◽  
pp. 77-80
Author(s):  
Sandra Miskoski ◽  
Viviana Nicotra ◽  
E. Saavedra ◽  
Vilma Balsaretti ◽  
N. A. Garcia
Keyword(s):  
Quantum Yield ◽  
Molecular Oxygen ◽  
Singlet Molecular Oxygen ◽  
Rose Oil ◽  
Rose Hip ◽  
The Rose

Evidence for the Generation of Singlet Molecular Oxygen during Dopa and Dopamine Peroxidation

1989 ◽  
Vol 44 (1-2) ◽  
pp. 39-44 ◽  
Author(s):  
Irena Kruk ◽  
Krzysztof Lichszteld ◽  
Teresa Michalska ◽  
Michel Bounias
Keyword(s):  
Quantum Yield ◽  
Molecular Oxygen ◽  
Singlet Molecular Oxygen ◽  
Influence Of Solvents

Abstract Participation of singlet molecular oxygen (1O2) in peroxidation of dopa and dopamine was studied by measurements of chemiluminescence spectra, the influence of solvents with various lifetime of O2 (1Δg) and O2 (1Δg)-quenchers on quantum yield of chemiluminescence. A decrease of absorption and fluorescence intensities of 1,3-diphenylizobenzofuran (DPBF) was also studied in the presence of dopa and dopamine oxidized with alkaline H2O2 as a criterion for the involvement of 1O2.

Determination of Phosphorescence Quantum Yield of Singlet Oxygen O 2( 1Δ g) Photosensitized by Phenalenone in Air-Saturated Carbon Tetrachloride

1998 ◽  
Vol 67 (11) ◽  
pp. 3664-3667 ◽  
Author(s):  
Okiyasu Shimizu ◽  
Jun Watanabe ◽  
Keiichi Imakubo ◽  
Shizuo Naito
Keyword(s):  
Carbon Tetrachloride ◽  
Quantum Yield ◽  
Singlet Oxygen ◽  
Phosphorescence Quantum Yield

Quantum yield of singlet molecular oxygen sensitization by copper(II) tetracarboxyphthalocy anine

1989 ◽  
Vol 3 (4) ◽  
pp. 615-624 ◽  
Author(s):  
M.Gabriela Lagorio ◽  
Lelia E. Dicelio ◽  
Enrique A. San Román ◽  
Silvia E. Braslavsky
Keyword(s):  
Quantum Yield ◽  
Molecular Oxygen ◽  
Singlet Molecular Oxygen
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