93487-60-6Relevant academic research and scientific papers
Aspects of investigating scrambling in the synthesis of porphyrins: Different analytical methods
Nielsen, Christian B.,Krebs, Frederik C.
, p. 5935 - 5939 (2005)
Herein, we discuss the analyses and quantification of the different components in porphyrin mixtures, prepared from p-anisaldehyde, p-tolualdehyde, and 5-(4-bromophenyl)-dipyrromethane with acid catalysis, using NMR and HPLC. The advantages and disadvantages of these analytical methods are emphasized. Due to the similar size of a bromine atom and a methyl group it was possible to grow crystals suitable for X-ray crystallographic studies from a mixture of porphyrins, where the 4-position of the meso-phenyl rings was either substituted with methyl groups or bromine atoms. We also show that X-ray studies are inferior to NMR analysis for determining the components in a porphyrin mixture.
Synthesis of some New Tetra-aryl Porphyrins for Studies in Solar Energy Conversion. Part 2. Asymmetric Porphyrins
Milgrom, Lionel R.
, p. 1483 - 1487 (2007/10/02)
The synthesis and characterisation of some asymmetrical meso-substituted porphyrins, for studies in solar energy conversion, are described.Isomeric porphyrins (5) and (6) could be cleanly separated and distinguished by the number of 13C n.m.r. resonances for the pyrrole α-carbon atoms.Similarly, 13C and 1H n.m.r. spectrometry was used to characterise a porphyrin with n-pentadecyl and benzoquinone meso-substituents, using the number of pyrrole α-carbon and β-hydrogen resonances.Thin films of porphyrin (11) coated onto glass slides fluoresced, indicating little or no concentration quenching in the coat.
