Specific retention behaviour of metal (III) tetraphenylporphyrins in non-aqueous, reversed high-performance liquid chromatography

Behavior of new complexes of tetrakis(4‐methoxyl phenyl)porphyrin with heavy rare earth elements in reversed‐phase high performance liquid chromatography

“…Compared with the free ligand of TMOPP, RE-TMOPP-Cl complex has a slightly larger molecular polarity and is easier to dissolve in methanol, Therefore, it can be concluded that RE-TMOPP-Cl complexes were strongly adsorbed on the alkyl-bonded silica gel stationary phase during the chromatographic process, which was similar to the retention behavior of complexes of porphyrin with trivalent transition metal ion reported by Suzuki et al [13].…”

“…In general, separation of metalloporphyrins with different central metal ions is more difficult than that of different porphyrin complexes of a certain metal, because in the former case the metal ion is surrounded by a bulky macrocyclic porphyrin structure to which various organic functional groups are further bonded. In the case of porphyrin coordinating with trivalent metal ions, the additional second ligand makes their retention mechanism more complicated than that of the complexes of porphyrin with divalent metal ions on an ODS column [13]. Thus, separation of complexes of porphyrin with different rare earth ions is a great challenge, in view of the very slight difference between the central ions.…”

High-performance liquid-chromatographic investigation of tetraphenylporphyrin and its derivatives

“…The dependence of logk of the tetraphenylporphyrin derivatives on the logarithm of the mole fraction (logM) of(a) isopropanol and (b) ethanol in the mobile phases hexane-isopropanol and acetonitrileethanol, respectively. The adsorption isotherms of tetra(p-methoxyphenyl)porphyrin (1, 4) and its complex with Pd(II) (2, 3, 5) on Silasorb 600 with chloroform as mobile phase (5), on Silasorb 600 with 90:10 hexaneisopropanol as mobile phase (3,4), and on Nucleosil C18 with 90:10 acetonitrile-ethanol as mobile phase (1, 2).…”