Spectroscopic characterization of zirconium(IV) and hafniumf(IV) gallate phthalocyanines in monolithic silica gels obtained by sol–gel method

Synthesis, Spectroscopic Characterization and Photoactivity of Zr(IV) Phthalocyanines Functionalized with Aminobenzoic Acids and Their GO-Based Composites

“…Dimerization, higher order association and self-aggregation of Pc rings usually take place in polar environments (polar solvents) that affects photochemical and photo physical properties of Pcs, for example, absorption intensity of complexes decrease during dimerization of metal phthalocyanine complexes. UV-Vis-NIR spectroscopy is a suitable mean to study this effect [46]. Shifts in Q band and changes in shape of this band indicate aggregation processes.…”

“…Shifts in Q band and changes in shape of this band indicate aggregation processes. In order to utilize Pcs in biomedicine, metal phthalocyanines should have good solubility without aggregation in polar solvents [46]. Therefore, aggregation properties of the obtained complexes were studied at different concentration range (0.25-2.25 µM) in DMSO and (0.25-6.25 µM) in saline.…”

Electrochemistry and spectroelectrochemistry of zirconium(IV) and hafnium(IV) phthalocyanines with b-diketone axial ligands

“…[15][16][17][18][19][20][21][22][23][24][25][26][27] Metallophthalocyanines in which the central atom has a valence of three or more are known to possess one or two out of plane axial ligands. [28][29][30][31] We recently reported the synthesis of zirconium and hafnium phthalocyanine complexes with various β-diketones and polyphenols which were made by replacing the two Cl -ions of the dichloro(phthalocyanine) complexes with organic ligands [17,23,24,27] and this was followed by a preliminary electrochemical study on some of these compounds.…”

Gallato Zirconium (IV) Phtalocyanine Complex Conjugated with SiO2 Nanocarrier as a Photoactive Drug for Photodynamic Therapy of Atheromatic Plaque

“…It can coordinate (for metals with a coordination number higher than 6, e.g., Zr has coordination number 7 or 8) additional ligands—solvent molecules. On the other hand, this type of coordination results in a high tendency toward the agglomeration of phthalocyanine complexes in a hydrophilic medium [ 12 , 13 ].…”