Modulation of Crystallinity and Optical Properties in Composite Materials Combining Iron Oxide Nanoparticles and Dye-Containing Covalent Organic Frameworks

Abstract

Two series of organic–inorganic composite materials were synthesized through solvothermal imine condensation between diketopyrrolopyrrole dialdehyde DPP-1 and 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (TAPP) in the presence of varying amounts of either amino- or carboxy-functionalized superparamagnetic iron oxide nanoparticles (FeO). Whereas high FeO loading induced cross-linking of the inorganic nanoparticles by amorphous imine polymers, a lower FeO content resulted in the formation of crystalline covalent organic framework domains. All hybrid materials were analyzed by magnetization measurements, powder X-ray diffraction, electron microscopy, IR, and UV/Vis absorption spectroscopy. Crystallinity, chromophore stacking, and visible absorption features are directly correlated to the mass fraction of the components, thus allowing for a fine-tuning of materials properties.

Porphyrin-Containing MOFs and COFs as Heterogeneous Photosensitizers for Singlet Oxygen-Based Antimicrobial Nanodevices

“…Nanosized composites containing porphyrin-based MOFs for antibacterial applications have been thoroughly explored, and evidence for synergic actions has been unambiguously provided. Concurrently, despite the fact many composites of porphyrin-based COFs have been described thorough the literature, particularly during the past three years, ,− composite materials using the photosensitizer porphyrins dedicated for generating ROS has been modestly employed. To the best of our knowledge, there is only one study reporting a composite material with graphitic carbon nitride (g-C 3 N 4 @COF) aiming at pollutant destruction in water .…”