کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1233936 | 968819 | 2010 | 9 صفحه PDF | دانلود رایگان |

Effects of solvent polarity on the photophysical behaviour of meso-tetra-2-chlorophenylporphyrin have been studied by means of steady-state absorption and fluorescence, as well as time-resolved fluorescence techniques. A non-mirror symmetric absorption and emission spectra due to vibronic borrowing were obtained. Time-resolved fluorescence study indicated the bi-exponential decay kinetics for both the emission bands, observed in steady-state emission spectra. Such findings implied that there exists two emitting species on the photoinduced conformational excursions of the excited-state equilibrium and also that their relative contributions to emission change with solvent polarity. Monte Carlo conformational search based on force-field molecular mechanics was performed to locate equilibrium conformers in the ground state which enable evaluation of the ground-state barrier energies. This was followed by CIS and ZINDO calculations to explore the excited-state barriers.
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 76, Issue 2, July 2010, Pages 230–238