92259-38-6Relevant academic research and scientific papers
The Electrostatically Paired Bis(dimethyl sulfoxide)(tetrakis(1-methylpyridinium-4-yl)porphinato)iron(III)/(4,4',4'',4'''-Tetrasulfonatophthalocyaninato)zinc(II) System. Solution Structure and Dynamics
Goodwin, John A.,Scheidt, W. Robert
, p. 4432 - 4439 (1990)
The electrostatic pairing interactions between the bis(dimethyl sulfoxide)(tetrakis(1-methylpyridinium-4-yl)porphinato)iron(III) cation, 5+, and the (4,4',4'',4'''-tetrasulfonatophthalocyaninato)zinc(II) anion, 4-, have been studied in dimethyl sulfoxide (DMSO) solution.Measurements of the electrostatic pair association constant, Kep, and its dependence upon ionic strength (Me4NClO4) were made with standard visible spectroscopic techniques while association dynamics were studied by NMR methods in DMSO-d6 solution.The exchange rate lawfor electrostatic pair formation takes into account DMSO solvent exchange of the iron porphyrin-solvent complex, and the exchange lifetime for the pair at ionic strength of 1 mM is calculated to be ca. 0.24 s at 25 deg C.Solution structural assessments were made by using measurements of the intermolecular dipolar relaxation of the (tetrasulfonatophthalocyaninato)zinc(II) protons due to the paramagnetic high-spin iron(III) center in the electrostatic pair.The structural model developed permitted calculation of a set of possible iron positions with respect to the phthalocyanine plane which are consistent with a cofacial dimeric structure displaying ?-? interactions due to pyrrole ring overlap.
