| Autor: |
Ben Brahim N; Laboratoire des Interfaces et Matériaux Avancés, Faculté des Sciences de Monastir, Bd. de l'Environnement, 5019 Monastir, Tunisia., Touaiti S; Laboratoire de Chimie Organique et Analytique, Institut Supérieur de l'Education et de la Formation Continue, 2000 Bardo, Tunisia., Sellés J; Laboratoire de Biologie du Chloroplaste et Perception de la Lumière chez les Micro-Algues, UMR 7141 CNRS-Sorbonne Université, Institut de Biologie Physico-Chimique, 75005 Paris, France., Lambry JC; Laboratoire d'Optique et Biosciences, INSERM U-1182, CNRS UMR-7645, Ecole Polytechnique, Palaiseau, France. michel.negrerie@polytechnique.edu., Negrerie M; Laboratoire d'Optique et Biosciences, INSERM U-1182, CNRS UMR-7645, Ecole Polytechnique, Palaiseau, France. michel.negrerie@polytechnique.edu. |
| Abstrakt: |
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. |
