Synthesis of a novel zinc phthalocyanine with peripherally coordinated Ru(II) complexes; sono-photochemical, photochemical and photophysical studies

Dual effect of light and ultrasound for efficient singlet oxygen generation with novel diaxial silicon phthalocyanine sensitizer

“…The bands in the 600–700 nm range are known as Q‐bands transitions, while the other bands between 300 and 400 nm in the UV region are called Soret or B bands 29 . These transitions differ in spectrum depending on factors such as solvent dielectric constant, substituents, metal ion size, oxidation number and electronic configuration 30 . In the UV–Vis spectrum, Q absorption bands of SiPc in DMSO, THF and toluene were detected at 674, 690 and 687 nm, and B bands were detected around 353, 362 and 331 nm, respectively.…”

“…The blue shift is defined as H‐aggregation, while the red shift is referred to as J‐aggregation. H‐aggregation occurs face‐to‐face while J‐aggregation forms end‐to‐end arrangement 30 …”

“…29 These transitions differ in spectrum depending on factors such as solvent dielectric constant, substituents, metal ion size, oxidation number and electronic configuration. 30 In the UV-Vis spectrum, Q absorption bands of SiPc in DMSO, THF and toluene were detected at 674, 690 and 687 nm, and B bands were detected around 353, 362 and 331 nm, respectively. When the molar extinction coefficients of SiPc are compared in DMSO (ε 674 = 1,157,225), THF (ε 690 = 1,121,564) and toluene (ε 687 = 1,015,400), it is seen that the peak intensities decrease at the same solvent order (Figure 1).…”

“…H-aggregation occurs face-to-face while J-aggregation forms end-to-end arrangement. 30 Aggregation, which causes splitting and broadening of absorption bands in UV-Vis spectra of phthalocyanines, differs subject to the intensification, temperature, build of substituents, solvent polarity and central metal ions. [33][34][35] Silicon Pcs containing two substituents in axial positions have no sign of aggregation and are crucial derivatives of phthalocyanine because they have the advantage of high solubility.…”

Peripherally, non-peripherally and axially pyrazoline-fused phthalocyanines: synthesis, aggregation behaviour, fluorescence, singlet oxygen generation, and photodegradation studies

“…21 Especially zinc and silicon phthalocyanines exhibit very good photochemistry and are widely used in PDT studies due to their efficient singlet oxygen production. 22–24…”