Chelation and fluorescence properties of tetraphenylporphyrin and 5,10,15,20-tetra(4-hydroxyphenyl)porphyrin in acetonitrile

Interaction of light with a non-covalent zinc porphyrin–graphene oxide nanohybrid

“…These spectra are similar to those reported earlier for ZnTPPH in acetonitrle. 21 The insertion of Zn(II) into the porphyrin ring of TPPH caused a small red-shift of the Soret band by 6 nm together with a decrease in the number of Q-bands. 10 The decrease in the number of Q-bands in the UV-vis spectra of ZnTPPH in comparison to TPPH is attributed to the increase of the symmetry of the porphyrin ring upon metalation.…”

“…This is especially true considering the Zhu group's reported enhanced photocatalytic activity toward hydrogen generation in a system where the free base 5,10,15,20-tetrakis(4-(hydroxyphenyl))porphyrin (TPPH) molecules played the role of a photosensitizer adsorbed on the surface of RGO sheets with Pt nanoparticles acting as the dispersed co-catalyst. 20 Because of the fact that spectroscopic properties of both the ZnTPPH dye itself as well as its hybrids with graphene oxide have not been studied except one report where absorption and emission spectra of ZnTPPH in acetonitrile were measured, 21 it is well justified to explore in detail how unbound ZnTPPH interacts with light and how this interaction is affected when the dye is non-covalently anchored to graphene oxide sheets. The main aim of the current study is to describe the nature of interaction between the components as well as to elucidate whether an electron-transfer process occurs between constituents within the nanohybrid material.…”