Luminescence of porphyrins and metalloporphyrins. Part 11. Energy transfer in zinc-metal-free porphyrin dimers was written by Brookfield, Ralph L.;Ellul, Henriette;Harriman, Anthony;Porter, George. And the article was included in Journal of the Chemical Society, Faraday Transactions 2 in 1986.Application of 57412-08-5 The following contents are mentioned in the article:
A series of covalently linked Zn-H2 porphyrin dimers (ZnP-H2P’) was synthesized. The linkage consists of a flexible alkoxy chain of variable length. Absorption spectroscopy shows that there is some exciton coupling between the 2 porphyrin rings, whereas fluorescence spectroscopy shows that the ZnP unit transfers singlet-state excitation energy to the H2P’. Time-resolved fluorescence studies showed that the dimers exist in solution in different, nonequilibrating conformations. A partially closed form permits reasonably close approach of the 2 porphyrin rings so that Foerster energy transfer is efficient. In a fully extended form, the 2 porphyrins are held too far apart for energy transfer to compete effectively with nonradiative decay of the ZnP excited singlet state. Triplet energy transfer is not observed, owing to unfavorable orientations for exchange coupling, and redox ion intermediates are not seen, even in polar solvent. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Application of 57412-08-5).
4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Ligands are classified based on the number of lone pair electrons available for the central metal atom, size and charge like anionic, cationic, neutral, monodentate, bidentate, polydentate ligands. The ability of ligands to engender a variety of useful properties of organometallic complexes is the major enabling force for the discovery of new catalytic reactions, activation of small molecules, dramatically enhanced reactivity.Application of 57412-08-5
Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI