Synthesis, characterization and electrochemical behaviour of cobalt(II) and cobalt(III):O2− complexes, respectively, with linear and tripodal tetradentate ligands derived from Schiff bases
Identifieur interne : 000268 ( France/Analysis ); précédent : 000267; suivant : 000269Synthesis, characterization and electrochemical behaviour of cobalt(II) and cobalt(III):O2− complexes, respectively, with linear and tripodal tetradentate ligands derived from Schiff bases
Auteurs : S. Djebbar-Sid [Algérie] ; O. Benali-Baitich [Algérie] ; J. P Deloume [France]Source :
- Journal of Molecular Structure [ 0022-2860 ] ; 2001.
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Abstract
New octahedral cobalt complexes with linear and tripodal tetradentate ligands derived from Schiff bases have been synthesized and characterized using elemental analysis, molar conductance, IR spectra, magnetic measurements, electronic and ESR spectra. The experimental results support the binding of linear ligands with two N and two O donor sites to cobalt ion. They show a square planar geometry and tripodal ligands coordinated to the metal ion by only one nitrogen atom, giving an arrangement of NO3 donor groups, the other axial sites being occupied by the molecular oxygen and/or the aquo molecules. From the results of cyclic voltammetry it is shown that chelate structure and ligand geometry and electron donating effect of the ligand substituents are among the factors influencing the redox potentials of the complexes. Linear ligands lead to high-spin cobalt(II) complexes. They do not interact with dioxygen and stabilize the Co(II) state counter to their related Schiff-base complexes. The low-spin complexes with tripodal ligands are O2 adducts and the configuration in these complexes is best formulated as [CoIIIO2−].
Url:
DOI: 10.1016/S0022-2860(00)00968-6
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ISTEX:AF93638666D0886CA7B4C0C85772A13472F9516BLe document en format XML
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P Deloume</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire d'Energétique et Synthèse Inorganique Université Claude Bernard, Boulevard du 11 Novembre 1918, 69622 Villeurbanne</wicri:regionArea><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Villeurbanne</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Molecular Structure</title><title level="j" type="abbrev">MOLSTR</title><idno type="ISSN">0022-2860</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="2001">2001</date><biblScope unit="volume">569</biblScope><biblScope unit="issue">1–3</biblScope><biblScope unit="page" from="121">121</biblScope><biblScope unit="page" to="128">128</biblScope></imprint><idno type="ISSN">0022-2860</idno></series><idno type="istex">AF93638666D0886CA7B4C0C85772A13472F9516B</idno><idno type="DOI">10.1016/S0022-2860(00)00968-6</idno><idno type="PII">S0022-2860(00)00968-6</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-2860</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cobalt(II) complexes</term><term>Electrochemical behaviour</term><term>Spectral studies</term><term>Synthesis</term><term>Tetradentate ligands complexes</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">New octahedral cobalt complexes with linear and tripodal tetradentate ligands derived from Schiff bases have been synthesized and characterized using elemental analysis, molar conductance, IR spectra, magnetic measurements, electronic and ESR spectra. The experimental results support the binding of linear ligands with two N and two O donor sites to cobalt ion. They show a square planar geometry and tripodal ligands coordinated to the metal ion by only one nitrogen atom, giving an arrangement of NO3 donor groups, the other axial sites being occupied by the molecular oxygen and/or the aquo molecules. From the results of cyclic voltammetry it is shown that chelate structure and ligand geometry and electron donating effect of the ligand substituents are among the factors influencing the redox potentials of the complexes. Linear ligands lead to high-spin cobalt(II) complexes. They do not interact with dioxygen and stabilize the Co(II) state counter to their related Schiff-base complexes. The low-spin complexes with tripodal ligands are O2 adducts and the configuration in these complexes is best formulated as [CoIIIO2−].</div></front></TEI><affiliations><list><country><li>Algérie</li><li>France</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Rhône-Alpes</li><li>Wilaya d'Alger</li></region><settlement><li>Alger</li><li>Villeurbanne</li></settlement></list><tree><country name="Algérie"><region name="Wilaya d'Alger"><name sortKey="Djebbar Sid, S" sort="Djebbar Sid, S" uniqKey="Djebbar Sid S" first="S" last="Djebbar-Sid">S. Djebbar-Sid</name></region><name sortKey="Benali Baitich, O" sort="Benali Baitich, O" uniqKey="Benali Baitich O" first="O" last="Benali-Baitich">O. Benali-Baitich</name></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Deloume, J P" sort="Deloume, J P" uniqKey="Deloume J" first="J. P" last="Deloume">J. P Deloume</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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