Reversible five-coordinate ⇄ six-coordinate transformation in cobalt(II) complexes

Publication Type:
Journal Article
Citation:
Journal of Molecular Structure, 2018, 1157 pp. 112 - 118
Issue Date:
2018-04-05
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© 2017 Elsevier B.V. The heterocyclic ligands 2,6-bis(pyrazol-1-yl)pyridine (L 1 ) and 2,6-bis(benzimidazol-2-yl)pyridine (L 2 ) and their cobalt(II) complexes were synthesized. The blue five-coordinate complex [Co(L 1 )Cl 2 ] isolated initially from the reaction mixture rapidly absorbed water vapour from the atmosphere to yield the pink six-coordinate complex [Co(L 1 )(H 2 O) 3 ]Cl 2 . This change is reversible upon desiccation or transferring [Co(L 1 )(H 2 O) 3 ]Cl 2 into acetonitrile. The five coordinate complex [Co(L 2 )Cl 2 ], however, remains stable under similar conditions. The structures of the complexes [Co(L 1 )Cl 2 ], [Co(L 1 )(H 2 O) 3 ]Cl 2 and [Co(L 2 )Cl 2 ] have been determined by x-ray crystallography. The magnetic susceptibilities and the electronic spectra for [Co(L 1 )Cl 2 ], [Co(L 2 )Cl 2 ] and [Co(L 1 )(H 2 O) 3 ]Cl 2 are presented.
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