Protoporphyrin IX dimethylester

PPME = protoporphyrin IX dimethylester, Melm = 1-methylimidazole, BuPy = butyl-pyridine, Py = pyridine, PSP = copolymer of styrene and 4-vinylpyridine (vinylpyridine content 23%, molecular weight 1.1 x 104). 

Table 13. Soret bands of protoporphyrin IX dimethylester iron(III) chloride in different solvents...

Apoglobin-mesoporphyrin IX complex Mesoporphyrin IX-dimethylester Mesoporphyrin IX-di-tert-butylester Protoporphyrin IX Protoporphyrin IX-dimethylester Uroporphyrin I... 

The cobalt(n) complexes of protoporphyrin-IX dimethylester and mesoporphyrin-IX dimethylester have been reduced polarographically.113 The original study by Stynes and Ibers114 of the oxygenation of the amine complexes of cobalt(n) protoporphyrin-IX dimethylester has been criticized by Guidry and Drago,115 who suggest that the treatment of the data was incorrect and that the system is ill-defined. Ibers et al.116 have reconsidered their data and claim that this substantiates the earlier work and proves that the system is clearly defined. 

Fe(III)-protoporphyrin-IX-dimethylester (7d) (0.03 mol%) was copolymerized with 7-conjugated monomers like styrene or methyl methacrylate in bulk and acrylamide in methanol using radicalic initiators Increasing the ratio of [7d]/[styrene] the molecular weight decreased (Table 3) indicating a chain transfer efiect of the porphyrin (chain transfer coeffident C,= 2.3). On the other side the content of covalent bond is increasing (Table 3). Therefore it is supposed that the observed reduction of Fe(III) to Fe(II) led to an addition of one porphyrin only at the chain end to give the polymer (34) (Eq. 14). 

Porphyrins are often employed in sensors on account of their ability to act as cation hosts and, with a suitable metal ion coordinated, as redox catalysts. Electropolymerised poly(metalloporphyrin)s have been used as potentiometric anion-selective electrodes [131] and as amperometric electrocatalytic sensors for many species including phenols [132], nitrous oxide [133] and oxygen [134]. Panasyuk et al. [135] have electropolymerised [nickel-(protoporphyrin IX)dimethylester] (Fig. 18.10) on glassy carbon in the presence of nitrobenzene in an attempt to prepare a nitrobenzene-selective amperometric sensor. Following extraction of the nitrobenzene the electrode was exposed to different species and cyclic voltammetric measurements made. A response was observed at the reduction potential of nitrobenzene (the polyporphyrin film acts only to accumulate the analyte and not in a catalytic fashion). Selectivity for nitrobenzene compared with w-nitroaniline and o-nitroto-luene was enhanced compared with an untreated electrode, while a glassy carbon-... 

H2PPIX-lm protoporphyrin IX dimethylester with imidazole covalently attached to porphyrin (see Figure 4.23)... 

Co(II)protoporphyrin-IX-dimethylester (7e) in poly(4-vinylpyridine-co-styrene)44 in toluene at... 

The limiting factor for practical use may be the expensive synthesis and often low yield of vinylporphyrins. (35) was prepared in a three step synthesis from pyrrol and benzaldehyde/p-nitrobenzaldehyd in an overall yield of 2%78). The picket fence porphyrin (36) is obtained in a yield of only 5%78. (35) is synthesized from the expensive protoporphyrin-IX-dimethylester (7f) with 45% yield80. ... 

The effect of heavy atoms on the relative yields of fluorescence and phosphorescence has been investigated both by inserting Br and I substituents in the ring of deuterioporphyrin IX and its Zn derivative,340 and by adding ethyl iodide to the solution of a number of free base porphyrins.341 Other authors discuss the luminescence of protoporphyrin IX dimethylester after pulse radiolysis in benzene,848 and from monomeric and dimeric ethylenediamine-substituted protoporphyrin IX and some metal derivatives.343 Several reports consider the emission from porphyrins in Shpolskii matrices and other crystalline organic hosts.344-340... 

Brisbin s studies on the incorporation of these metals into haematoporphyrin-and protoporphyrin-IX-dimethylester also await better knowledge of species in pure acetic acid (58, 59). As for Cu(II), the rate law... 

Table 4-13. Radical copolymerization of styrene with Fe(III) protoporphyrin-IX dimethylester (FePP) or hemine (FeH).

Methylpheophorbide a itself can be formed from chlorophyll a by removal of the central magnesium ion and transesterification with methanol. Partial synthesis was also used for the preparation of heme d (63) (13, 60) along a multistep reaction sequence starting from protoporphyrin IX dimethylester (26). 

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