Nonlinear optical absorption and optical limiting studies of fluorinated pyridyl porphyrins in chlorobenzene: An insight into the photo-induced protonation effects

Carbazole appendedtrans-dicationic pyridinium porphyrin finds supremacy in DNA binding/photocleavage over a non-carbazolyl analogue

“…The very less intense fluorescence peak of Cu(II) complex 3 was observed and it may be because of the energy states which can act as quenching states that will provide an easy way for radiation-less transitions to the ground state. 61,62 The fluorescence results are consistent with the previously reported free-base porphyrin and metalloporphyrins. 20,22,59 The time-resolved fluorescence studies of compounds 1-4 were performed and the lifetime data were compiled in Table 2 and depicted in Fig.…”

Two-photon absorption in halide perovskites and their applications

“…Optical limiting has attracted significant attention because of the increased demand for delicate optical sensors that can protect human body (especially eyes) from laser damage. 24 It is reported that there are many kinds of materials that have the optical limiting properties, including organic dyes, [190][191][192] semiconductor materials, 193,194 organic polymers, 195,196 and carbon nanostructured materials. 197,198 Halide perovskite materials show optical limiting properties as well, as most of the intense laser power can be absorbed by halide perovskites once the laser beam power has reached the TPA threshold.…”

Unsymmetrically β-Functionalized π-Extended Porphyrins: Synthesis, Spectral, Electrochemical Redox Properties, and Their Utilization as Efficient Two-Photon Absorbers

“…However, in other metal complexes, the partially filled dorbitals interact significantly with the macrocycle orbitals, leading to a charge-transfer (CT) state, which quenched the spin−orbit interaction and hence the triplet state lifetime that results in lower nonlinear optical response. 21,99,100 To extract the magnitude and sign of the nonlinear refractive index, closed-aperture (CA) Z-scans were performed under the same environmental condition for all of the samples. The CA Z-scan traces are represented in Figure 6 for all of the synthesized porphyrins.…”

“…Porphyrin, a highly conjugated π-system, actively participates in several biological processes like oxygen transport and storage, electron transport, catalysis, photosynthesis, etc. , Apart from their biological activity, due to their intriguing physicochemical, optoelectronic, and intense absorptions in the visible region and electrochemical redox properties, porphyrinoids have attracted much attention in the field of material chemistry, inorganic chemistry, and nanoscience. Porphyrins have been widely utilized in photodynamic therapy (PDT), − dye-sensitized solar cells (DSSCs), − catalysis, − nonlinear optical (NLO) materials, − ion sensing, − sorbents, − and self-assembly. , The electronic properties of the porphyrin π-system can be modulated by anchoring suitable substituents at β - or meso -positions. The substituents at β -positions exert more pronounced electronic and steric effects than those at meso -aryl positions. , To explore the chemistry of β -functionalized porphyrins, an easy and important synthetic step that can access a variety of β -functionalized porphyrins is the aromatic electrophilic substitution of the meso- tetraarylporphyrins with nitro, formyl, acyl, or bromo substituents. − Recently, our group is exploring the different methodologies for the synthesis of β -substituted porphyrins with mixed substituent patterns and thoroughly investigating their absorption and emission spectral features, physicochemical properties, intriguing electrochemical redox behavior, and the effect of substituents on the porphyrin π-system. − …”