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http://nopr.niscpr.res.in/handle/123456789/33768| Title: | Synthesis of zinc porphyrins and effect of peripheral substituents on the coordination reaction |
| Authors: | Wang, Shujun Peng, Yuling Zhang, Chenggen Li, Yongbing Liu, Chao |
| Keywords: | Coordination chemistry;Theoretical chemistry;Porphyrins;Zinc porphyrins;UV-visible spectroscopy;Fluorescence quenching |
| Issue Date: | Feb-2016 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Three free-base porphyrins, modified with Boc-D-threonine and their zinc porphyrins have been synthesized using benzaldehyde, 4-chlorobenzaldehyde, and 4-methoxybenzaldehyde. The effects of peripheral substituents on the coordination reactions between zinc porphyrins and imidazole derivatives have been studied by UV-visible spectroscopy, fluorescence spectrometry, and theoretical calculations. The results show that the coordination reaction forms a Zn-N bond between zinc porphyrins involving different peripheral substituents and imidazole derivatives. The association coordination constants decrease (N-MeIm > Im) due to the change in enthalpy; the zinc porphyrin synthesized using 4-chlorobenzaldehyde and N-methylimidazole shows the largest association constant. Fluorescent quenching is observed during the coordination process with the zinc porphyrin synthesized using 4-methoxybenzaldehyde and N-methylimidazole showing the largest Stern-Volmer quenching rate constant. In addition, theoretical calculations have been used to investigate essential characteristics of the reaction, charges, bond lengths, and bond energies for each system. |
| Page(s): | 145-152 |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Appears in Collections: | IJC-A Vol.55A(02) [February 2016] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 55A(2) 145-152.pdf | 550.17 kB | Adobe PDF | View/Open |
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