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Substitution of bi- and mono- dentate Lewis bases in organocobalt(III) complexes holding a tridentate ligand: Routes to novel series of organocobalt compounds by I. Ya. Levitin; A.N. Kitaigorodskii; A.T. Nikitaev; V.I. Bakhmutov; A.L. Sigan; M.E. Vol'Pin is a Chemistry article available to read on EtoBox.

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Routes have been designed to prepare new series of hexacoordinate cobalt(ll1) complexes containing a u-bonded alkyl group (R), a mixed tridentate ligand and various mono-or bidentate Lewis bases. They consist of one or several reactions of either direct or proton-assisted ligand substitution, as exemplified by a model scheme for introducing two identical neutral monodentate ligands into the complexes with the planar tridentate anion o--OC,H&(Me)= N(CH&NH\* (7-Me-salen)-: [RCo(7-Me-salen)(e %-[RCo(7-Me-salen&.]' L'W A[RCo(7-Me-salen)Lz']t -[RCo(7-Me-salen)Lz"]+ Step 1 allows the chelating diamine in starting cation complexes to be replaced by weaker bases. Step 2 is suitable for introducing ligands effectively binding Co(ll1) ion, viz. typical chelating molecules and anions, or strong uniacidic bases. Step 3 permits the latter monodentate ligands to be exchanged for weaker bases. A variety of cationic, neutral and anionic complexes were thus obtained. Stoichiometry, stability and coordination geometry of these complexes are related to characteristics of newly introduced ligands (basicity, charge, steric requirements, ability to chelate). Their coordination in the trans-R-position wa

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Author

I. Ya. Levitin; A.N. Kitaigorodskii; A.T. Nikitaev; V.I. Bakhmutov; A.L. Sigan; M.E. Vol'Pin

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0020-1693)

Published

1985

Language

EN

Field

Chemistry (Physical Sciences)