The control of nitric oxide dynamics and interaction with substituted zinc-phthalocyanines

Phthalocyanines are artificial macrocycles that can harbour a central metal atom with four symmetric coordinations. Similar to metal-porphyrins, metal-phthalocyanines (M-PCs) may bind small molecules, especially diatomic gases such as NO and O 2 . Furthermore, various chemical chains can be grafted...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2024-01, Vol.53 (2), p.772-78
Main Authors: Ben Brahim, Nassim, Touaiti, Sarra, Sellés, Julien, Lambry, Jean-Christophe, Negrerie, Michel
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Chemical Sciences
Diatomic gases
Life Sciences
Nitric oxide
Pharmaceutical sciences
Porphyrins
Potential energy
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Summary:Phthalocyanines are artificial macrocycles that can harbour a central metal atom with four symmetric coordinations. Similar to metal-porphyrins, metal-phthalocyanines (M-PCs) may bind small molecules, especially diatomic gases such as NO and O 2 . Furthermore, various chemical chains can be grafted at the periphery of the M-PC macrocycle, which can change its properties, including the interaction with diatomic gases. In this study, we synthesized Zn-PCs with two different substituents and investigated their effects on the interaction and dynamics of nitric oxide (NO). Time-resolved absorption spectroscopy from picosecond to millisecond revealed that NO dynamics dramatically depends on the nature of the groups grafted to the Zn-PC macrocycle. These experimental results were rationalized by DFT calculations, which demonstrate that electrostatic interactions between NO and the quinoleinoxy substituent modify the potential energy surface and decrease the energy barrier for NO recombination, thus controlling its affinity. Time-resolved spectroscopy from picosecond to millisecond reveals that nitric oxide (NO) dynamics dramatically depends on the nature of external groups grafted to Zn-phthlalocyanine. The experimental results were rationalized by DFT calculations.
ISSN:1477-9226
1477-9234
DOI:10.1039/d3dt03356b