NDLI: Synthesis of zinc porphyrins and effect of peripheral substituents on the coordination reaction

Content Provider	CSIR - National Institute of Science Communication and Policy Research (NISCPR)
Author	Zhang, Chenggen Wang, Shujun Li, Yongbing Liu, Chao Peng, Yuling
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.
Ending Page	152
Starting Page	145
ISSN	03764710
e-ISSN	09750975
Journal	Indian Journal of Chemistry -Section A (IJC-A)
Issue Number	02
Volume Number	55A
Language	English
Publisher	CSIR-NISCAIR, India
Publisher Date	2016-02-01
Access Restriction	Open
Rights License	CC Attribution-Noncommercial-No Derivative Works 2.5 India
Subject Keyword	Zinc porphyrins UV-Visible Spectroscopy Coordination Chemistry Theoretical Chemistry Porphyrins Fluorescence quenching
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry Physical and Theoretical Chemistry

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