研究目的
Investigating the effect of the medium on fluorescence parameters and photostability of porphyrins of different structure.
研究成果
The UV photostability and thermal stability of porphyrins are determined by modifications to the macroheterocyclic scaffold. The formation of acid-base H-associates or asymmetric protonated forms reduces photostability, while symmetrical cationic forms can stabilize the molecule. The Stokes shift value characterizes the degree of nonplanarity of the macrocycle and its NH-activity.
研究不足
The study focuses on a specific set of porphyrins and solvents, potentially limiting the generalizability of the findings to other compounds or conditions.
1：Experimental Design and Method Selection:
The study involved measuring fluorescence and photostability of porphyrins in different solvents (benzene, DMF, acetic acid) under UV irradiation. Thermogravimetric analysis was used to study thermal decomposition under inert atmosphere.
2：Sample Selection and Data Sources:
A series of Н2Р compounds (1–15) with different structural types were selected.
3：List of Experimental Equipment and Materials:
SM2203 spectrofluorimeter, UV-1800 Shimadzu spectrophotometer, DRT 125 mercury-quartz lamp, DSC 204 F1 differential scanning calorimeter with TG 209 F1 Iris balance.
4：Experimental Procedures and Operational Workflow:
Fluorescence emission spectra were measured at 90° angle with respect to the excitation source. Photostability was studied by irradiating solutions with UV light and measuring absorption spectra at regular intervals. Thermogravimetric studies were performed under static argon atmosphere.
5：Data Analysis Methods:
Stokes shift was calculated using a specific equation. The degree of photodecomposition was estimated from the decrease in absorbance.
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