A porphyrin-based porous organic polymer H₂Pp-TAPM containing flexible chains has been synthesized successfully. The H₂Pp-TAPM has demonstrated the ability to facilitate the transfer and separation of photogenerated electron–hole pairs and delivered superior activity in the selective aerobic oxidation of sulfides to sulfoxides.

Porphyrin-based porous organic polymers (Por-POPs) are attracting increasing attention because of their potential in visible light photocatalysis. The distinctive attributes of Por-POPs have been elucidated by investigating their response to specific reactions, such as the aerobic oxidation of sulfides. However, most researchers choose porphyrin molecules with relatively short peripheral substituent chains and strong stiffness to construct porphyrin-based materials, especially Por-POPS. Herein, we designed and prepared a flexible POP material H₂Pp-TAPM by incorporating extra π-conjugated rigid units TAPM into a relatively flexible porphyrin monomer H₂Pp through imine linkages. The POP synthesized in this study has demonstrated the ability to facilitate the transfer and dissociation of photogenerated electron–hole pairs, leading to the production of singlet oxygen ¹O₂ and superoxide radical anions O₂˙⁻. These anions act as effective mediators for the selective aerobic oxidation of sulfides, resulting in the conversion of 99% and the selectivity more than 99%. Furthermore, the H₂Pp-TAPM has excellent stability and recyclability, indicating its attractiveness as heterogeneous photocatalyst for the transformation of organic compounds. This makes it a promising candidate for visible-light-driven reactions.

In this work, novel Ni (II) complexes, namely, [Ni₂(L)₂(OAc)₂(EtOH)₂] (1a), [Ni₂(L)₂(OAc)₂(H₂O)₂] (1b-1) and [Ni₂(L)₂(OAc)₂(EtOH)₂] (1b-2) as co-crystal were synthesized by the 1:1 condensation (https://www.sciencedirect.com/topics/chemistry/condensation) of Ni (CH₃COO)₂·4H₂O and Schiff base ligand (H₂L) (2-hydroxy-4-methoxybenzaldehyde and 2-amino-2-methylpropanol). The ligand based on Schiff base and fabricated complexes (1a) and (1b-1 and 1b-2) were successfully identified by CHN assessment, FT-IR, UV–Vis spectra, melting point and CV voltammogram. The electrochemical behavior investigation shows that the nickel complexes exhibited irreversible oxidation processes in methanol solution. Additionally, the crystal structures of complexes (1a) and (1b) have been recognized by single-crystal X-ray diffraction investigation. It turned out that the complexes (1b-1) and (1b-2) crystallize together, making a co-crystal 1b with an additional EtOH solvent molecule in the crystal structure. A detailed study of intermolecular exchanges was performed using attractive graphical analysis tools such as three-dimensional Hirshfeld surfaces analysis, two-dimensional fingerprint plots (FPs), and enrichment ratios (E), which make C-H … C, C-H … O hydrogen bond, C … O, H … H, and O … O short contacts on Hirshfeld surfaces with color code are observed. Moreover, an appraisement of the inhibitory trace against coronavirus (main protease SARS-CoV-2, PDB ID: 6Y2F) and molecular targets of human angiotensin-converting enzyme-2 (ACE-2) was performed by a molecular docking study in which two nickel complexes performed best for PDB protein ID: 6M0J and all three complexes for PDB protein ID: 6Y2F.