Photobleaching-Electron Density for the Molecular Structures of Pyropheophorbide a and Pyropheophorbide Methyl Ester in Dimethylformamide Solution

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Comparative spectroscopic study and quantum calculations were performed on the photobleaching of pyropheophorbide methyl ester (PPME) and pyropheophorbide a (PPa) in dimethylformamide (DMF) organic solvent. The photobleaching efficiency of PPa was found to be higher than that of PPME. Quantum calculations on the molecular structures of the investigated compounds revealed that the outer carbon atoms were susceptible to the attack by singlet oxygen molecule ( 1O2)
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Electron density; Singlet Oxygen; Tumor; Hamiltonian Operator; Photobleaching

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