Characterization of a non-aggregating silicon(iv) phthalocyanine in aqueous solution: toward red-light-driven photocatalysis based on earth-abundant materials

Abstract

Photophysical and photochemical characterization of a novel cationic silicon phthalocyanine with excellent water solubility properties is reported. The robust red-light responsive compound shows very attractive features as a sensitizer for reductive and oxidative quenching processes to trigger photocatalytic substrate conversion in aqueous solution.

Recent progress in homogeneous multielectron transfer photocatalysis and artificial photosynthetic solar energy conversion

“…For example, the far-red light harvesting function of chlorophyll f (Fig. 1) could be readily replaced in a synthetic system by more robust photoreactive metallo-phthalocyanine derivatives with similar absorption characteristics [2,12]. M a n u s c r i p t In general, a broad range of deeply coloured dye molecules such as porphyrin derivatives, perylene diimides and several others, as well as inorganic chromophores such as semiconductor nanoparticles can be employed for replacing the red light absorption (low-bandgap) function of natural photosynthetic pigments.…”

“…This requires the presence of a suitable electron acceptor site, which can accumulate and store several electrons with only a modest difference in potentials between the successive reduction steps [12]. Another, quite different but very powerful strategy to achieve the required MET reactivity is to create light-sensitive multielectron transfer reagents, which are able to form a net twoelectron photoredox product upon absorption of only one photon [7].…”

Preparation and in vitro anticancer activity comparison of photosensitive nanoparticles with different self-assemble degree

“…To check the 1 O 2 generation, we have monitored the decay of spectral signal at 379 nm (λ max of ADMA), using 470 nm LED illumination because ADMA can be oxidized by 1 O 2 to its corresponding endoperoxide [17,18]. Figure 5A showed the decay curves for HA, HA nanosheet, nano-flower and nonhomogeneous aggregations in aqueous solutions with ADMA.…”

Silicon Phthalocyanines Axially Disubstituted with Erlotinib toward Small‐Molecular‐Target‐Based Photodynamic Therapy

“…[34] As reported, as ilicon centera llows the introductiono ft wo appropriate axial ligands to inhibit the p-p stacking tendency of phthalocyanine (Pc) rings;t hus, axially substituted silicon phthalocyanines (SiPcs)h ave emerged to improve the hydrophilicity and inhibit the self-aggregation of Pcs. [32,[35][36][37][38][39] On the otherh and, axially substituted SiPc can efficiently avoid the problem of isomerization, and its simple structure provides the potentialf or clinicala pplication. [34] More importantly,S iPcs enable the introductiono ft wo small-molecular-target-based moieties at the axial positions, which may improvet he specificity to cancer and anticancer activity.F or these reasons, SiPcs are of great interest to our group for conjugating with smallmolecular-target-based drugs for targeted PDT.…”