Formation and Photoinduced Electron Transfer in Porphyrin- and Phthalocyanine-Bearing N-Doped Graphene Hybrids Synthesized by Click Chemistry.
Jose Luis G FierroHabtom B GobezeYoungwoo JangMyriam BarrejónConcepción ParejoJulio C ÁlvarezFernando LangaÁngela Sastre-SantosFrancis D'SouzaFernando LangaPublished in: Chemistry (Weinheim an der Bergstrasse, Germany) (2022)
Graphene doped with heteroatoms such as nitrogen, boron, and phosphorous by replacing some of the skeletal carbon atoms is emerging as an important class of two-dimensional materials as it offers the much-needed bandgap for optoelectronic applications and provides better access for chemical functionalization at the heteroatom sites. Covalent grafting of photosensitizers onto such doped graphenes makes them extremely useful for light-induced applications. Herein, we report the covalent functionalization of N-doped graphene (NG) with two well-known electron donor photosensitizers, namely, zinc porphyrin (ZnP) and zinc phthalocyanine (ZnPc), using the simple click chemistry approach. Covalent attachment of ZnP and ZnPc at the N-sites of NG in NG-ZnP and NG-ZnPc hybrids was confirmed by using a range of spectroscopic, thermogravimetric and imaging techniques. Ground- and excited-state interactions in NG-ZnP and NG-ZnPc were monitored by using spectral and electrochemical techniques. Efficient quenching of photosensitizer fluorescence in these hybrids was observed, and the relatively easier oxidations of ZnP and ZnPc supported excited-state charge-separation events. Photoinduced charge separation in NG-ZnP and NG-ZnPc hybrids was confirmed by using the ultrafast pump-probe technique. The measured rate constants were of the order of 10 10 s, -1 thus indicating ultrafast electron transfer phenomena.
Keyphrases
- electron transfer
- photodynamic therapy
- quantum dots
- energy transfer
- highly efficient
- metal organic framework
- fluorescence imaging
- high resolution
- visible light
- magnetic resonance
- molecular docking
- liquid chromatography
- oxide nanoparticles
- room temperature
- optical coherence tomography
- solar cells
- breast reconstruction
- tandem mass spectrometry
- contrast enhanced
- molecularly imprinted
- mass spectrometry