TETRA PORPHINE

Fig. 1. Structure of 5,10,15,20 tetrakis(l-methyl-4pyridyl)21H,23H-porphine,tetra-p-fosylate salt.

In conclusion, from the three types of organic inhibitors studied, it can be said that 5,10,15,20 tetrakis(l-methyl-4pyridyl)21H,23H-porphine,tetra-p>-fosylate salt, having the immersion time of 5 minutes was almost similar with the paint used and gives an anticorrosive protection much better than the porphyrin previously tested (H2TPP porphyrin (5,10,15,20 tetrakis 4 phenyl-21H,23H). Similar results can be seen, from the visual observations of the salt spray chamber test. 

Manganese nitrosyl porphyrins [215] are considered good models for the iron-nitric oxide analogs, which are relatively unstable but very vital to many biological operations. A six-coordinate manganese nitrosyl porphyrin of the form (por)Mn(NO)(L), where por can be TTP (TTP = tetra(4-methylphenyl)porphine) and L = piperidine, methanol, 1-methyhmidazole, has been prepared [216] in moderate yields by the reductive nitrosylation of the (por)MnCl complex with NO in piperidine. The crystal structures of these compounds give indication of a linear Mn-NO bond [215]. 

The water-soluble Fe porphyrin, 3Na+ [Fe(III)(TPPS)] -12H20 [H2TPPS4- = tetra-anionic form of meso-tetrakis(7r-sulfonatophenyl)porphine], has recently been shown to be an effective catalyst for the electroreduction of nitrite to ammonia [419]. The Fe meso-tetrakis(A -methyl-4-pyridyl) porphyrin and/or the Fe meso-tetrakis (jr -sulfophenyl) porphyrin complex shows a catalytic activity for the reduction of dioxygen in aqueous solutions, leading to hydrogen peroxide [420]. 

Reduction of p-oxo-bis[tetraphenylporphin iron(iii)] with sodium amalgam gives several products sequentially. The first reduction product is the radical-anion [(tpp)Fe ] , which has a spin state of - at 77 K and at 300 K. This is the first reported study of an Fe -porphyrin.Mossbauer data on a range of tetra-aryl-substituted iron-porphines and their p-oxo-bridged derivatives have been reported. A crystallographic study on bis(imidazole) otPy -tetraphenylporphinatoiron(iii) chloride-methanol solvate shows the [FeN ] core to be quasitetragonal. An n.m.r. study has been made of the related... 

T(p-C2H 0)PP tetra(p-ethoxyphenyl)porphin TFPP tetra(pentafluoro-... 

The carotenoids, trans-3 carotene (Sigma), I canthaxanthin (Fluka), II 3-8 -apocarotenal (Fluka), III and crocetin (Sigma), IV were used in this study (see structure). Of the above four carotenoids, only crocetin is water soluble. The porphyrins 5,10,15,20-tetra-phenyl-21H,23H-porphine (TPP) and 5,10,15,20-tetra-(4-sodiumsulfonato-phenyl)-21H,23H-porphine, TPPS were obtained from Aldrich, TPPS is a water soluble porphyrin. Carotenoids I-III were used as supplied, however crocetin was purified according to published methods (15) just prior to use. 

N,N -ethylenebis(salicylideneiminato) ion meso-tetra(2,4,6 -trimethyl- 3,5 -disulfonato)porphin 5,10,15,20 -tetrakis(N-methyl- 4 -pyridyl)porphyrin... 

Parameter Copper tetra-phenylporphin Copper tetra-phenyl(pival-amido) porphin Tetramethyl ether of copper hemato-IX porphyrin... 

Fig. 5. Preparation of an iron(IV)oxo porphyrin radical cation bold lines, refer to meso-tetra mesityl porphine...

Tetraazamacrocyclanemetal perchlorates, 391 Tetrahydropyranyl ether derivatives, 391 Tetra(N-methylpyridyl)porphine perchlorates, 391 Tetramethyl [14] tetraene-N8 metal perchlorates, 392... 

Fig. 1 Basic structure (left side) and the absorption spectra (right side) of some photosensitizers. The absorption spectra of porphyrins (derived from porphins) consists of a Soret band (around 400 nm) and four Q-bands. Upon reduction of one or two double-bonds of the tetra-pyrrole structure or by expanding the number of 7i-electrons (by expanding the ring structure), the outermost Q-band becomes bathochromically shifted and the absorption coefficient increased as indicated on the figure. As described in the text, such chemical modifications are important for improving the therapeutic effect in deeper tissue layers...

Athene epoxidation.1 In the presence of a Mn-porphinate, particularly 5.10,15,20-tetra-2,6-dichlorophenylporphinatomanganese(III) acetate,2 MMPP can spoxidize alkenes in the presence of a phase-transfer catalyst in high yield. Addition of a base (pyridine) improves the rate. 

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