Noncovalent Stabilization of Water-Soluble Zinc Phthalocyaninate in Graphene Oxide Hydrosol

• Published in: Colloid journal of the Russian Academy of Sciences 2023-12, Vol.85 (6), p.961-974
• Main Authors: Nugmanova, A. G., Gorshkova, A. I., Yagodin, A. V., Averin, A. A., Kalinina, M. A.
• Format: Article
• Language: English
• Subjects: Absorption spectroscopy; Aqueous solutions; Binding; Chemistry; Chemistry and Materials Science; Colloid chemistry; Coordination; Functional groups; Graphene; Metal clusters; Microscopy; Nitrophenol; Oxidation resistance; Photodegradation; Polymer Sciences; Raman spectroscopy; Rhodamine 6G; Spectrum analysis; Stabilization; Substrates; Surfaces and Interfaces; Thin Films; Water chemistry; X ray powder diffraction; Zinc; Zinc acetate
• ISSN: 1061-933X; 1608-3067
• DOI: 10.1134/S1061933X23600859

The possibility of stabilization of zinc(II) 2,3,9,10,16,17,23,24-octa[(3,5-sodium biscarboxylate)phenoxy] phthalocyaninate (ZnPc 16 ) by its hybridization with the surface of graphene oxide (GO) sheets via van der Waals or coordination bonds with functional groups of the carbon matrix in the GO hydrosols has been investigated. A combination of physicochemical analysis methods (scanning electron microscopy, fluorescence microscopy, powder X-ray diffraction, and Raman spectroscopy) has been employed to confirm the integration of ZnPc 16 with GO nanosheets and to study the morphology and structure of the obtained hybrid materials. Using electronic absorption spectroscopy, it has been found that, regardless of the hybridization method, the binding of the macrocycles to the inorganic particles increases the stability of ZnPc 16 in an aqueous medium being irradiated with visible light. The analysis of spectral kinetic data has shown that, in contrast to the system obtained by direct integration of ZnPc 16 and GO, the hybrid material formed by coordination bonding of the components via zinc acetate (Zn(OAc) 2 ) as a binding metal cluster is able to exhibit photocatalytic properties in oxidative photodegradation of some model organic pollutant substrates (rhodamine 6G, 1,5-dihydroxynaphthalene, and 1,4-nitrophenol). The proposed colloid-chemical approach to the stabilization of photoactive water-soluble phthalocyaninates makes it possible to increase their resistance to photoinduced self-oxidation and can be adapted for various derivatives of tetrapyrrole compounds possessing photosensitizing properties.