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  • Title: Interaction between certain porphyrins and CdS colloids: a steady state and time resolved fluorescence quenching study.
    Author: Jhonsi MA, Kathiravan A, Renganathan R.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2008 Dec 15; 71(4):1507-11. PubMed ID: 18583183.
    Abstract:
    The interaction between porphyrins namely, meso-tetrakis (4-methoxyphenyl)porphyrin (TMeOPP), protoporphyrin IX (PPIX) and Zinc(II) meso-tetraphenylporphyrin (ZnTPP) with colloidal CdS has been studied by using steady state and time resolved fluorescence quenching measurements. The porphyrins adsorbed on the surface of colloidal CdS due to electrostatic interaction. This adsorption leads to changes in the absorption spectra related to the complex formation. The apparent association constant (Kapp) was in the order of 4.34-5.58 x 10(5) M(-1) from the effect of colloidal CdS on the absorption spectra and 0.64-1.6 x 10(5) M(-1) from fluorescence quenching data. Quenching is attributable mainly to static mechanism through ground state complex formation as confirmed by lifetime measurements.
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