News

Impact Factor 2021 = 1.200 has been issued by ISI Web of Knowledge (JCR 2021).

SCImago Journal & Country Rank

ISSN 1998-9539

Electrochemical Deposition of Aggregated Cobalt Sulfophthalocyanines at Gold Surfaces in Alkaline Solutions

Mariia A. Kovanova,@ Polina D. Derbeneva, Anton S. Postnov, Tatiana V. Tikhomirova, and Arthur S. Vashurin
Ivanovo State University of Chemistry and Technology, Department of Inorganic Chemistry, 153000 Ivanovo, Russian
Federation
@Corresponding author E-mail: mariia.a.kovanova@gmail.com

 

In this paper, the method of cyclic voltammetry was used for the first time to study the electrochemical behavior of series of peripheral substituted cobalt phthalocyanines with consistently changing sulfonated fragments (cobalt phthalocyanine tetrasulfonic acid (CoPcI), cobalt tetra-4-[(6-sulfo-2-naphthyl)oxy]phthalocyanine (CoPcII), cobalt tetra-4-[(6,8-disulfo-2-
naphthyl)oxy]phthalocyanine (CoPcIII), cobalt tetra-4-[(4-sulfo-1-naphthyl)oxy]-tetra-5-(1-benzotriazolyl)phthalocyanine (CoPcIV), cobalt tetra-4-[(1,6-disulfo-2-naphthyl)oxy]-tetra-5-(1-benzotriazolyl)phthalocyanine (CoPcV), cobalt tetra-4-[(1,6-disulfo-2-naphthyl)oxy]-tetra-5-(nitro)phthalocyanine (CoPcVI), cobalt tetra-4-{4-[1-methyl-1-(4-ulfophenyl)ethyl]phenoxy}-tetra-5-(nitro)phthalocyanine (CoPcVII), and cobalt octa-4,5-{4-[1-methyl-1-(4-sulfophenyl)ethyl]phenoxy}phthalocyanine (CoPcVIII)) in an aqueous alkaline solution. Comparative analysis of the electrochemical behavior depending on the functional substitution in the macrocycle molecule was carried out. For all the compounds, central metal ion oxidation (Co2+ → Co3+) and reduction (Co2+ → Co1+) processes, as well as phthalocyanine ring activity were registered. Based on the occurrence of some peaks in the first scan numbers and the appearance/disappearance of other peaks, a hypothesis regarding the mechanism of electrodeposition of cobalt phthalocyanine derivatives at gold electrodes was formulated. It was shown that the electrodeposition process is generally independent on the nature of the substituent in the phthalocyanine macroring. It was also confirmed that reacting species are adsorbed on the electrode surface without specific diffusion.

References:

AttachmentSize
mhc224233k.pdf925.99 KB