Two　unsymmetrical　phthalocyanines　(Pcs)　having　a　strong　tendency　toward　forming　aggregations　were　synthesized　and　the　electronic　absorption　spectral　studies　revealed　that　their　monomers　are　much　easier　to　be　protonated　or　decomposed　than　the　aggregations　in　acidic　or　oxidative　conditions.　Before　being　protonated　or　decomposed,　the　aggregations　are　always　disassembled　into　the　monomers　in　the　solutions.　This　conclusion　is　undoubtedly　of　considerable　realistic　significance　for　the　practical　application　as　molecular　catalysis.　©　2013　Elsevier　B.V.