Manganese-quinizarin-pyrazinecarboxylic acid mixed-ligand complex in aprotic media. Formation of a manganese(III)- semiquinone binuclear species
Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one...
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E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1999 |
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| Umfang: |
4 |
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| Reproduktion: |
Springer Online Journal Archives 1860-2002 |
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| Übergeordnetes Werk: |
in: Transition metal chemistry - 1975, 24(1999) vom: Apr., Seite 474-477 |
| Übergeordnetes Werk: |
volume:24 ; year:1999 ; month:04 ; pages:474-477 ; extent:4 |
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NLEJ196072743 |
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| 245 | 1 | 0 | |a Manganese-quinizarin-pyrazinecarboxylic acid mixed-ligand complex in aprotic media. Formation of a manganese(III)- semiquinone binuclear species |
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| 520 | |a Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus s.c.e. and +0.50 V versus s.c.e.. The association between the metal ion and the ligands prevail and the oxidations finally produce a dark-red complex which possesses the same stoichiometry as the original deep-blue species. In the latter the metal ion is present in oxidation state +3 with the quinizarine dianion as the corresponding semiquinone of the oxidized quinizarine. The monoanion of pyrazincarboxylic acid remains unchanged. Controlled-potential electrolysis at −0.20 V versus s.c.e. of a solution of the mixed-ligand complex indicates that it is binuclear, generating a MnII-MnIIImixed-valence species. The latter is, in turn, reduced at −1.60 V versus s.c.e. producing probably a mononuclear of manganese(II) species. If manganese(II) is combined with the semiquinone of quinizarine the metal ion exhibits the␣magnetic characteristic of manganese(III) and the␣semiquinone is reduced to the quinizarine dianion, indicating that the mixed-ligand formed exhibits intramolecular charge-transfer. This is a good example of a binuclear species accumulating four oxidation equivalents after oxidation of both metal centers and the quinizarine ligands. | ||
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| 700 | 1 | |a Copia, Georgina |4 oth | |
| 700 | 1 | |a Francisco, M Jara |4 oth | |
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(DE-627)NLEJ196072743 DE-627 ger DE-627 rakwb eng Manganese-quinizarin-pyrazinecarboxylic acid mixed-ligand complex in aprotic media. Formation of a manganese(III)- semiquinone binuclear species 1999 4 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus s.c.e. and +0.50 V versus s.c.e.. The association between the metal ion and the ligands prevail and the oxidations finally produce a dark-red complex which possesses the same stoichiometry as the original deep-blue species. In the latter the metal ion is present in oxidation state +3 with the quinizarine dianion as the corresponding semiquinone of the oxidized quinizarine. The monoanion of pyrazincarboxylic acid remains unchanged. Controlled-potential electrolysis at −0.20 V versus s.c.e. of a solution of the mixed-ligand complex indicates that it is binuclear, generating a MnII-MnIIImixed-valence species. The latter is, in turn, reduced at −1.60 V versus s.c.e. producing probably a mononuclear of manganese(II) species. If manganese(II) is combined with the semiquinone of quinizarine the metal ion exhibits the␣magnetic characteristic of manganese(III) and the␣semiquinone is reduced to the quinizarine dianion, indicating that the mixed-ligand formed exhibits intramolecular charge-transfer. This is a good example of a binuclear species accumulating four oxidation equivalents after oxidation of both metal centers and the quinizarine ligands. Springer Online Journal Archives 1860-2002 Bodini, Mario E. oth Valle, M. Angélica del oth Copia, Georgina oth Francisco, M Jara oth in Transition metal chemistry 1975 24(1999) vom: Apr., Seite 474-477 (DE-627)NLEJ188985212 (DE-600)1501083-1 1572-901X nnns volume:24 year:1999 month:04 pages:474-477 extent:4 http://dx.doi.org/10.1023/A:1017164226925 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 24 1999 4 474-477 4 |
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(DE-627)NLEJ196072743 DE-627 ger DE-627 rakwb eng Manganese-quinizarin-pyrazinecarboxylic acid mixed-ligand complex in aprotic media. Formation of a manganese(III)- semiquinone binuclear species 1999 4 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus s.c.e. and +0.50 V versus s.c.e.. The association between the metal ion and the ligands prevail and the oxidations finally produce a dark-red complex which possesses the same stoichiometry as the original deep-blue species. In the latter the metal ion is present in oxidation state +3 with the quinizarine dianion as the corresponding semiquinone of the oxidized quinizarine. The monoanion of pyrazincarboxylic acid remains unchanged. Controlled-potential electrolysis at −0.20 V versus s.c.e. of a solution of the mixed-ligand complex indicates that it is binuclear, generating a MnII-MnIIImixed-valence species. The latter is, in turn, reduced at −1.60 V versus s.c.e. producing probably a mononuclear of manganese(II) species. If manganese(II) is combined with the semiquinone of quinizarine the metal ion exhibits the␣magnetic characteristic of manganese(III) and the␣semiquinone is reduced to the quinizarine dianion, indicating that the mixed-ligand formed exhibits intramolecular charge-transfer. This is a good example of a binuclear species accumulating four oxidation equivalents after oxidation of both metal centers and the quinizarine ligands. Springer Online Journal Archives 1860-2002 Bodini, Mario E. oth Valle, M. Angélica del oth Copia, Georgina oth Francisco, M Jara oth in Transition metal chemistry 1975 24(1999) vom: Apr., Seite 474-477 (DE-627)NLEJ188985212 (DE-600)1501083-1 1572-901X nnns volume:24 year:1999 month:04 pages:474-477 extent:4 http://dx.doi.org/10.1023/A:1017164226925 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 24 1999 4 474-477 4 |
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(DE-627)NLEJ196072743 DE-627 ger DE-627 rakwb eng Manganese-quinizarin-pyrazinecarboxylic acid mixed-ligand complex in aprotic media. Formation of a manganese(III)- semiquinone binuclear species 1999 4 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus s.c.e. and +0.50 V versus s.c.e.. The association between the metal ion and the ligands prevail and the oxidations finally produce a dark-red complex which possesses the same stoichiometry as the original deep-blue species. In the latter the metal ion is present in oxidation state +3 with the quinizarine dianion as the corresponding semiquinone of the oxidized quinizarine. The monoanion of pyrazincarboxylic acid remains unchanged. Controlled-potential electrolysis at −0.20 V versus s.c.e. of a solution of the mixed-ligand complex indicates that it is binuclear, generating a MnII-MnIIImixed-valence species. The latter is, in turn, reduced at −1.60 V versus s.c.e. producing probably a mononuclear of manganese(II) species. If manganese(II) is combined with the semiquinone of quinizarine the metal ion exhibits the␣magnetic characteristic of manganese(III) and the␣semiquinone is reduced to the quinizarine dianion, indicating that the mixed-ligand formed exhibits intramolecular charge-transfer. This is a good example of a binuclear species accumulating four oxidation equivalents after oxidation of both metal centers and the quinizarine ligands. Springer Online Journal Archives 1860-2002 Bodini, Mario E. oth Valle, M. Angélica del oth Copia, Georgina oth Francisco, M Jara oth in Transition metal chemistry 1975 24(1999) vom: Apr., Seite 474-477 (DE-627)NLEJ188985212 (DE-600)1501083-1 1572-901X nnns volume:24 year:1999 month:04 pages:474-477 extent:4 http://dx.doi.org/10.1023/A:1017164226925 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 24 1999 4 474-477 4 |
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(DE-627)NLEJ196072743 DE-627 ger DE-627 rakwb eng Manganese-quinizarin-pyrazinecarboxylic acid mixed-ligand complex in aprotic media. Formation of a manganese(III)- semiquinone binuclear species 1999 4 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus s.c.e. and +0.50 V versus s.c.e.. The association between the metal ion and the ligands prevail and the oxidations finally produce a dark-red complex which possesses the same stoichiometry as the original deep-blue species. In the latter the metal ion is present in oxidation state +3 with the quinizarine dianion as the corresponding semiquinone of the oxidized quinizarine. The monoanion of pyrazincarboxylic acid remains unchanged. Controlled-potential electrolysis at −0.20 V versus s.c.e. of a solution of the mixed-ligand complex indicates that it is binuclear, generating a MnII-MnIIImixed-valence species. The latter is, in turn, reduced at −1.60 V versus s.c.e. producing probably a mononuclear of manganese(II) species. If manganese(II) is combined with the semiquinone of quinizarine the metal ion exhibits the␣magnetic characteristic of manganese(III) and the␣semiquinone is reduced to the quinizarine dianion, indicating that the mixed-ligand formed exhibits intramolecular charge-transfer. This is a good example of a binuclear species accumulating four oxidation equivalents after oxidation of both metal centers and the quinizarine ligands. Springer Online Journal Archives 1860-2002 Bodini, Mario E. oth Valle, M. Angélica del oth Copia, Georgina oth Francisco, M Jara oth in Transition metal chemistry 1975 24(1999) vom: Apr., Seite 474-477 (DE-627)NLEJ188985212 (DE-600)1501083-1 1572-901X nnns volume:24 year:1999 month:04 pages:474-477 extent:4 http://dx.doi.org/10.1023/A:1017164226925 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 24 1999 4 474-477 4 |
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(DE-627)NLEJ196072743 DE-627 ger DE-627 rakwb eng Manganese-quinizarin-pyrazinecarboxylic acid mixed-ligand complex in aprotic media. Formation of a manganese(III)- semiquinone binuclear species 1999 4 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus s.c.e. and +0.50 V versus s.c.e.. The association between the metal ion and the ligands prevail and the oxidations finally produce a dark-red complex which possesses the same stoichiometry as the original deep-blue species. In the latter the metal ion is present in oxidation state +3 with the quinizarine dianion as the corresponding semiquinone of the oxidized quinizarine. The monoanion of pyrazincarboxylic acid remains unchanged. Controlled-potential electrolysis at −0.20 V versus s.c.e. of a solution of the mixed-ligand complex indicates that it is binuclear, generating a MnII-MnIIImixed-valence species. The latter is, in turn, reduced at −1.60 V versus s.c.e. producing probably a mononuclear of manganese(II) species. If manganese(II) is combined with the semiquinone of quinizarine the metal ion exhibits the␣magnetic characteristic of manganese(III) and the␣semiquinone is reduced to the quinizarine dianion, indicating that the mixed-ligand formed exhibits intramolecular charge-transfer. This is a good example of a binuclear species accumulating four oxidation equivalents after oxidation of both metal centers and the quinizarine ligands. Springer Online Journal Archives 1860-2002 Bodini, Mario E. oth Valle, M. Angélica del oth Copia, Georgina oth Francisco, M Jara oth in Transition metal chemistry 1975 24(1999) vom: Apr., Seite 474-477 (DE-627)NLEJ188985212 (DE-600)1501083-1 1572-901X nnns volume:24 year:1999 month:04 pages:474-477 extent:4 http://dx.doi.org/10.1023/A:1017164226925 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 24 1999 4 474-477 4 |
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Formation of a manganese(III)- semiquinone binuclear species</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1999</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">4</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zzz</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">z</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zu</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus s.c.e. and +0.50 V versus s.c.e.. The association between the metal ion and the ligands prevail and the oxidations finally produce a dark-red complex which possesses the same stoichiometry as the original deep-blue species. In the latter the metal ion is present in oxidation state +3 with the quinizarine dianion as the corresponding semiquinone of the oxidized quinizarine. The monoanion of pyrazincarboxylic acid remains unchanged. Controlled-potential electrolysis at −0.20 V versus s.c.e. of a solution of the mixed-ligand complex indicates that it is binuclear, generating a MnII-MnIIImixed-valence species. The latter is, in turn, reduced at −1.60 V versus s.c.e. producing probably a mononuclear of manganese(II) species. 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manganese-quinizarin-pyrazinecarboxylic acid mixed-ligand complex in aprotic media. formation of a manganese(iii)- semiquinone binuclear species |
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Manganese-quinizarin-pyrazinecarboxylic acid mixed-ligand complex in aprotic media. Formation of a manganese(III)- semiquinone binuclear species |
| abstract |
Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus s.c.e. and +0.50 V versus s.c.e.. The association between the metal ion and the ligands prevail and the oxidations finally produce a dark-red complex which possesses the same stoichiometry as the original deep-blue species. In the latter the metal ion is present in oxidation state +3 with the quinizarine dianion as the corresponding semiquinone of the oxidized quinizarine. The monoanion of pyrazincarboxylic acid remains unchanged. Controlled-potential electrolysis at −0.20 V versus s.c.e. of a solution of the mixed-ligand complex indicates that it is binuclear, generating a MnII-MnIIImixed-valence species. The latter is, in turn, reduced at −1.60 V versus s.c.e. producing probably a mononuclear of manganese(II) species. If manganese(II) is combined with the semiquinone of quinizarine the metal ion exhibits the␣magnetic characteristic of manganese(III) and the␣semiquinone is reduced to the quinizarine dianion, indicating that the mixed-ligand formed exhibits intramolecular charge-transfer. This is a good example of a binuclear species accumulating four oxidation equivalents after oxidation of both metal centers and the quinizarine ligands. |
| abstractGer |
Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus s.c.e. and +0.50 V versus s.c.e.. The association between the metal ion and the ligands prevail and the oxidations finally produce a dark-red complex which possesses the same stoichiometry as the original deep-blue species. In the latter the metal ion is present in oxidation state +3 with the quinizarine dianion as the corresponding semiquinone of the oxidized quinizarine. The monoanion of pyrazincarboxylic acid remains unchanged. Controlled-potential electrolysis at −0.20 V versus s.c.e. of a solution of the mixed-ligand complex indicates that it is binuclear, generating a MnII-MnIIImixed-valence species. The latter is, in turn, reduced at −1.60 V versus s.c.e. producing probably a mononuclear of manganese(II) species. If manganese(II) is combined with the semiquinone of quinizarine the metal ion exhibits the␣magnetic characteristic of manganese(III) and the␣semiquinone is reduced to the quinizarine dianion, indicating that the mixed-ligand formed exhibits intramolecular charge-transfer. This is a good example of a binuclear species accumulating four oxidation equivalents after oxidation of both metal centers and the quinizarine ligands. |
| abstract_unstemmed |
Abstract The monoanion of pyrazincarboxylic acid (PcA−), the dianion of quinizarine (Qz=) and manganese(II) yield a soluble deep-blue complex in dimethylsulphoxide whose MnII:Qz=:PcA− stoichiometry has been established as 1:1:1. This mixed-ligand complex is oxidized in two steps, each involving one equivalent of charge per complex present, as indicated by controlled-potential electrolyses done at +0.30V versus s.c.e. and +0.50 V versus s.c.e.. The association between the metal ion and the ligands prevail and the oxidations finally produce a dark-red complex which possesses the same stoichiometry as the original deep-blue species. In the latter the metal ion is present in oxidation state +3 with the quinizarine dianion as the corresponding semiquinone of the oxidized quinizarine. The monoanion of pyrazincarboxylic acid remains unchanged. Controlled-potential electrolysis at −0.20 V versus s.c.e. of a solution of the mixed-ligand complex indicates that it is binuclear, generating a MnII-MnIIImixed-valence species. The latter is, in turn, reduced at −1.60 V versus s.c.e. producing probably a mononuclear of manganese(II) species. If manganese(II) is combined with the semiquinone of quinizarine the metal ion exhibits the␣magnetic characteristic of manganese(III) and the␣semiquinone is reduced to the quinizarine dianion, indicating that the mixed-ligand formed exhibits intramolecular charge-transfer. This is a good example of a binuclear species accumulating four oxidation equivalents after oxidation of both metal centers and the quinizarine ligands. |
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GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE |
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Manganese-quinizarin-pyrazinecarboxylic acid mixed-ligand complex in aprotic media. Formation of a manganese(III)- semiquinone binuclear species |
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http://dx.doi.org/10.1023/A:1017164226925 |
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Bodini, Mario E. Valle, M. Angélica del Copia, Georgina Francisco, M Jara |
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