Complex cationic porphyrin

In haemin the iron is combined thus The two hydrogen atoms of the NH-groups of its porphyrin are replaced by two principal valencies of the metal which is also united in complex combination to the two other N-atoms (as in the complex nickel compound of dimethylglyoxime according to Tschugaev). Then the resulting complex cation combines with Cl or another univalent anion to form a salt. 

Photoinduced Hydrogen Evolution with Water-soluble Viologen-linked Cationic Porphyrin Metal Complexes and Hydrogenase... 

The most common metal complexes of porphyrins are those formed by replacement of the two nitrogen-bound hydrogen atoms with a relatively small cation. Indeed, metal complexes of porphyrins are widespread in petroleum. Their concentrations are quite low and in some oils porphyrins do not appear to be present (Reynolds, 1997). 

Complexes of porphyrins with highly charged cations of p-, d-, and f-metals 93KK171. 

Synthetic routes for the preparation of lanthanide monoporphyrinate complexes with non-diketonate anionic axial ligands have been developed in recent years. Wong and coworkers developed a convenient synthetic route for the preparation of cationic lanthanide(III) monoporphyrinate complexes [Ln(porphyrin)(H20)3]Cl via the protonolysis of lanthanide(III) amide... 

The sensitivity of VCD to structural variations of the polypeptide-porphyrin complexes is demonstrated in Fig. 8.7. The secondary structure of the peptidic part of the poly-L-glutamic acid-cationic porphyrin TATP complex can be changed by pH variation. At acidic pH ( 5), its a-helical structure is demonstrated by the... 

Some very sensitive methods for determination of copper with porphyrins have been described. The molar absorptivities of the copper cationic complexes of porphyrins at the sharp Soret bands (near 400 nm) are of the order (2-5)-10 [9,10,72,73]. Examples are (a,p,y,5-tetraphenylporphyrin trisulphonic acid (formula 19.6) [72]. The porphyrins have been utilized in the presence of various surfactants [74,75] the value of e = 4.7-10 has been... 

Ito, A.S., Azzellini, G.C., Silva, S.C., Serra, O., and Szabo, A.G. (1992) Optical absorption and fluorescence spectroscopy studies of ground state melanin-cationic porphyrin complexes, Biophys. Chem., 45 79-89. 

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