79408-54-1Relevant articles and documents
The use of perchlorato(tetraphenylporphinato)manganese(III) as a reagent for the spectrophotometric determination of anions in nonaqueous solvents
Hinman, A. Scott,McGarty, Karen,Tang, Clement,Pavelich, Brad J.
, p. 545 - 550 (2007/10/02)
Perchlorato(tetraphenylporphinato)manganese(III) (TPPMnClO4) is shown to be a useful reagent for the determination of a variety of anions in nonaqueous media.The analysis is based on the displacement of coordinated perchlorate by more strongly coordinating anions as monitored spectrophotometrically.The procedure is demonstrated for the determination of tetra-alkylammonium salts of nitrate, nitrite, chloride, bromide, iodide, acetate, trifluoroacetate, cyanate, and thiocyanate in acetonitrile.Relative precisions and accuracies of the order of five parts per thousand are indicated.Key words: perchlorato(tetraphenylporphinato)manganese(III), spectrophotometric determination of anions, anions in nonaqueous media.
Structural and electronic properties of six-coordinate manganese(III) porphyrin cations. Crystal and molecular structure of bis(N,N-dimethylformamide)(tetraphenylporphinato)manganese(III) perchlorate, [MnIIITPP(DMF)2]+ClO4-
Hill, Craig L.,Williamson, Michael M.
, p. 2836 - 2841 (2008/10/08)
In toluene or chloride-free chloroform solutions of Mn-TPP(ClO4) in the presence of the neutral ligands L = dimethylformamide, dimethylacetamide, 1-methylimidazole, dimethyl sulfoxide, and tetrahydrofuran the six-coordinate cationic complexes [MnIIITPP(L)2]+ClO4- form. One of these complexes, bis(N,N-dimethylformamide)(tetraphenylporphinato)manganese(m) perchlorate [MnIIITPP(DMF)2]+ClO4- (1), was isolated, purified, and characterized in detail. The electronic spectra, H NMR spectra and magnetic properties of 1 in solution establish that this complex contains a high-spin S = 2 MnIII atom with a (dxzπ,dyzπ)2(dxy) 1(d z2σ)1 electronic configuration. The variable-temperature 1H NMR data furthermore rule out any change in ground electronic state over the temperature range -30 to +55 °C. All the cationic MnIII porphyrin complexes undergo fast exchange of the neutral axial ligands, L, on the NMR time scale even at -40 °C. Complex 1 forms solvate-free crystals in space group C2/c. The unit cell has a = 17.7386 (43) A?, b = 17.7182 (60) A?, c = 15.9477 (56) A?, β = 118.693 (22)° and Z = 4. The structure was solved by the heavy-atom method and converged with a final R = 0.0841. The six-coordinate S = 2 MnIII atom displays the predicted tetragonal elongation with very long MnIII-O(DMF) bonds (2.217 (4) A?). Complex 1 shows a temperature-dependent alteration of coordination geometry in solution with the six-coordinate species predominating below -10 °C and a five-coordinate species predominating above +10 °C.