2000
DOI: 10.1590/s0103-50532000000500005
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Abstract: As porfirinas aniônicas 5,10,15-tris(4-carboxifenil), 20-mono(2-nitrofenil) porfirina (1), 5,10(ou 15)-bis(4-carboxifenil), 15(or 10),20-bis(2-nitrofenil)porfirina (2) and 5-mono(4-carboxifenil), 10,15,20-tris(2-nitrofenil)porfirina (3), foram sintetizadas diretamente através da reação de pirrol com os benzaldeídos substituídos em meio de ácido propiônico/nitrobenzeno. A relação molar dos benzaldeídos foi controlada para otimizar a síntese e purificação das porfirinas desejadas. Esta nova série de porfirinas f… Show more

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Cited by 32 publications
(17 citation statements)
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“…A single multi-electron reduction of meso- C 6 H 4 NO 2 groups has previously been reported for copper triarylcorroles 39 as well as for tetraphenylporphyrins having the same electroactive substituents at the four meso -positions of the macrocycle. 34, 35 …”
Section: Resultsmentioning
confidence: 99%
“…A single multi-electron reduction of meso- C 6 H 4 NO 2 groups has previously been reported for copper triarylcorroles 39 as well as for tetraphenylporphyrins having the same electroactive substituents at the four meso -positions of the macrocycle. 34, 35 …”
Section: Resultsmentioning
confidence: 99%
“…13 C NMR data to 4a showed signals that confirm the presence of alkyl (13.85-35.83 ppm), ethers (66.22 ppm) and aromatic groups (111.37-158.45 ppm). Similar signals were observed for metalloporphyrins 4b-d ( Figure S1).…”
Section: Characterizationmentioning
confidence: 92%
“…were obtained via mixed aldehyde condensations, using a mixture of two different aldehydes as starting materials. [11][12][13] Asymmetric porphyrins are molecules that exhibit some advantages over the symmetric porphyrins (A4) like: reduced aggregation, groups that allows the use of a wide range of solvents, and presence of dipole moment, which may facilitate the electron injection into the TiO 2 conduction band.…”
Section: Introductionmentioning
confidence: 99%
“…8 In order to decrease the number of porphyrins obtained in the synthesis and to avoid extremely tedious chromatographic purification, the system was optimised with small-scale reactions using different rations of the two aldehydes. In this way, in the synthesis of A 3 B porphyrin, the initial ratio of pyrrole: 2-hydroxy-5-nitrobenzaldehyde: 4-carboxybenzaldehyde used was 4: 2,7: 1.…”
Section: Synthesismentioning
confidence: 99%