Physico-chemical characteristics of molecular complexes for water-soluble metallophthalocyanines with alcohol were obtained by the method of thermogravimetric analysis. The change of aggregation state of metallophthalocyanines in aqueous alkaline solutions which is due to the ethanol additions was explained taking into consideration the results of thermogravimetric analysis of metallophthalocyanines crystallosolvates with ethanol. (C) 2004 Elsevier B.V. All rights reserved.