Cobalt(III) complexes with linear hexadentate N6 or N4S2 donor set atoms providing pyridyl-amide-amine/thioether coordination |
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| Authors: | Aminou Mohamadou Jean-Pierre Barbier |
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| Institution: | a GRECI, Groupe de Recherche en Chimie Inorganique, Faculté des Sciences, Université de Reims Champagne-Ardenne, Moulin de la Housse, BP 1039 - 51687, Reims Cedex 2, France
b Université de Versailles Saint-Quentin-en-Yvelines, Institut Lavoisier UMR 8180, 45, Avenue des Etats-Unis, 78035 Versailles Cedex, France |
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| Abstract: | Two new cobalt(III) complexes of symmetric hexadentate ligand with N6 1,10-bis(2-picolinamide)-4,7-diazadecane (pycdpnen)] and N4S2 1,8-bis(2-picolinamide)-3,6-dithiaoctane (pycdadt)] donor set atoms have been synthesized as perchlorate salts and characterized by spectroscopic methods. All two ligands with strong-field pyridylcarboxamido N donor stabilize Co(III) as demonstrated by the facile oxidation of the cobalt center. The structures of Co(pycdpnenH−2)](ClO4) (1) and Co(pycdadtH−2)](ClO4) · H2O (2) investigated by COSY, HMBC, HMQC and NOESY NMR studies show that compounds 1 and 2 have the same geometrical configuration. The X-ray analysis reveals that complex 2 crystallizes in a orthorhombic space group Pccn. The cation Co(pycdadtH−2)]+ is distorted octahedral with the two pyridyl groups in cis position. |
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| Keywords: | Cobalt Picolinamide N4S2/N6 donor sets ligands NMR X-ray diffraction |
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