1998
DOI: 10.1039/a804684k
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Investigation of the redox interaction between iron(III) 5,10,15,20-tetrakis( p-sulfonatophenyl)porphyrinate and aminoiminomethanesulfinic acid in aqueous solution

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Cited by 4 publications
(5 citation statements)
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“…(1) Anion-radical SO 2is not a primary product of decomposition of the thiourea dioxides as it was hypothesized earlier. 15,30 The most plausible candidate is sulfoxylate ion, SO 2 2-, which is known to possess powerful reducing properties. 40 (2) In alkaline solutions, O 2 , O 2 -, and H 2 O 2 do not react directly with TDO (MTDO, DMTDO) or other nitrogen-containing species.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…(1) Anion-radical SO 2is not a primary product of decomposition of the thiourea dioxides as it was hypothesized earlier. 15,30 The most plausible candidate is sulfoxylate ion, SO 2 2-, which is known to possess powerful reducing properties. 40 (2) In alkaline solutions, O 2 , O 2 -, and H 2 O 2 do not react directly with TDO (MTDO, DMTDO) or other nitrogen-containing species.…”
Section: Resultsmentioning
confidence: 99%
“…The mechanism of decomposition of thioureas has proven to be very complex. , None of the previous mechanisms have been able to explain all available experimental results. ,, Surprisingly, though most of the biological applications of TDO are related to its strong reducing properties exhibited especially in alkaline solutions, which are attributed to its decomposition products (sulfoxylic acid, H 2 SO 2 , or the anion radical SO 2 - ), there are no data available on the possible toxic effects of these powerful reductants in vivo. It is known that anion-radical SO 2 - reacts very rapidly with oxygen to produce superoxide …”
Section: Introductionmentioning
confidence: 99%
“…It was found in special experiments that these changes are not related to decomposition of TUDO or to the presence of oxygen. The 1 H NMR spectra of aqueous 38 and dimethyl sulfoxide 39 solutions of TUDO were found to vary with time. The peak observed initially in the TUDO spectrum is rapidly split into a doublet, these changes taking place only in the first minutes after dissolution of thiourea dioxide.…”
Section: The Structure Of Molecules Of Sulfur-containing Reducing Agentsmentioning
confidence: 99%
“…It is well known that the solid TDO exists in (NH 2 ) 2 CSO 2 form by XRD technique, and the TDO molecules are linked by a system of hydrogen bonds . Makarov et al considered tautomerization of TDO in aqueous solution followed by rearrangement of its linear TDO–water oligomer at a low precise semiempiritical AM1 theoretical level because the changes in the 1 H NMR spectra of TDO with time are not closely related to the formation rate of aminoimino methanesulfinic acid (AIMSA). , TDO is very stable in acidic aqueous solvent, but AIMSA is unstable in aqueous solvent. , All of these facts show that the exact structure of TDO in aqueous phase is not clear. It is well known that Raman spectroscopic technique is very suitable to investigate the aqueous system because Raman scattering signals of water are very weak.…”
Section: Introductionmentioning
confidence: 99%
“…6 Makarov et al considered tautomerization of TDO in aqueous solution followed by rearrangement of its linear TDO−water oligomer at a low precise semiempiritical AM1 theoretical level because the changes in the 1 H NMR spectra of TDO with time are not closely related to the formation rate of aminoimino methanesulfinic acid (AIMSA). 7,8 TDO is very stable in acidic aqueous solvent, but AIMSA is unstable in aqueous solvent. 4,7 All of these facts show that the exact structure of TDO in aqueous phase is not clear.…”
Section: Introductionmentioning
confidence: 99%