Spectral studies of zinc octacarboxyphthalocyanine aggregation

Photophysical and Photochemical Properties and Aggregation Behavior of Phthalocyanine and Naphthalocyanine Derivatives

“…10,11 However, detailed studies comparing Pc and Nc aggregation in solution are lacking. 12,13 In the current study, we investigate the impact of the extended π-conjugation in macrocycles with same peripheral substituents ( Figure 1). We evaluated the photophysical and photochemical properties in DMSO solution, and their aggregation in DMSO:water mixtures.…”

Synthesis of 4,5-Dicyanophthalic Acid and Its Functional Derivatives

“…Only few examples of preparation of monomeric free ligand OCPcH 2 starting from 1,2,4,5-tetracyanobenzene in mild conditions with moderate yields are reported. [26,27] A much more attractive way which allows to obtain both metal complexes and free ligand and avoids formation of polymeric by-products is the tetramerization of 4,5-dicyanophthalic acid derivatives, mainly its alkyl esters [28][29][30][31] followed by hydrolysis if the acids are target compounds. Only a few reports on the synthesis of N-unsubstituted imide [32,33] and N,N-dialkylamides [33,34] of 4,5-dicyanophthalic acid were found in the literature.…”

Synthesis and selected properties of metallo and metal-free 2,3,9,10,16,17,23,24 –octacarboxyphthalocyanines

“…30 The locations of the bands in UV-Vis absorption spectra for H 2 PcOC, i.a. in aqueous solutions, in solutions with different pH values, in mixed solutions (water-ethanol, watermethanol) and in solutions containing surfactants are presented by Suchan et al 44 In water the location of the Q and B bands changes and the concentration of the studied phthalocyanine has a strong effect on the location. In solutions with pH of 7.12 the following  max (the Q band) for H 2 PcOC have been obtained: 674; 706 nm.…”

“…The cationic surfactant interacts with H 2 PcOC molecule and this leads to the enrichment of the chromophoric system. 44 UV-Vis absorption spectra for ZnPcOC, Al(OH)PcOC, (OH) 2 SiPcOC and (OH) 2 GePcOC in the phosphate buffer with pH of 7.4 and solution with pH of 10 have been shown by Idowu and Nyokong. 45,46 Those complexes show a characteristic absorption with the Q band at the wavelength of about 690 nm ( Table 2).…”

“…the type of complexated metal ion to ligand, solvation of molecules, a different degree of dissociation which depends on the type of solvent, the ability of the solvent to establish hydrogen bonds with octacarboxyphthalocyanine molecules and a coordination of solvent molecules into the central metal of those complexes. 43 Also when a concentrated H 2 SO 4 is used the locations of bands with a strong bathochromic shift are obtained because of the protonation of meso-nitrogen atoms. 30 The locations of the bands in UV-Vis absorption spectra for H 2 PcOC, i.a.…”