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ISSN 1998-9539

Effect of pH on Acid-Base and Photophysicochemical Properties of 2,3,9,10,16,17,23,24-Octacarboxyphthalocyanines in Aqueous Media

Oleg L. Kaliya,a,b Nina A. Kuznetsova,b@ Roman A. Bulgakov,b Ludmila I. Solovyova,b Ekaterina N. Shevchenko,b Ludmila K. Slivka,b and Evgeny A. Lukyanetsb
aMoscow Technological University, Institute of Fine Chemical Technology, 119571 Moscow, Russia
bOrganic Intermediates and Dyes Institute, 123001 Moscow, Russia
@Corresponding author E-mail: lab32@niopik.ru
 
DOI: 10.6060/mhc160646k
Macroheterocycles 2016 9(2) 186-192
 
The results of study of pH effect on the aggregation, acid-base and photophysicochemical properties of 2,3,9,10,16,17,23,24-octacarboxy substituted Zn, Al, Co, Pt and Pd phthalocyanines (MPcoc) in aqueous media are presented. The ionization of peripheral carboxyl groups and axial ligation of central metal atom are the principal factors, governing aggregation. The multi-step ionization of MPcocs, induced by change of pH, was considered as pseudo two-step process affecting four carboxyl groups on each step. The photophysicochemical properties of three differently ionized forms of ZnPcoc (unionized, tetra- and octacarboxylated) were studied..

 

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