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Metal transition complexes of tridentate Schiff base ligands derived from 2-hydrazinopyridine: synthesis, spectroscopic characterization and X-ray structures

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Abstract

Mononuclear complexes of 1-(pyridin-2-ylmethylidene)-2-(pyridin-2-yl)hydrazine (HL1) and 1-(pyridin-2-yl)-2-(1-(pyridin-2-yl)ethylidene)hydrazine (HL2), [Mn(HL1)(Cl2)(H2O)] (1), [Zn(HL1)(CH3COO)2]·(H2O)3 (2), [Mn(HL2)2]·(ClO4)2 (3) and [Cu(HL2)(NO3)2(H2O)] (4) were synthesized and characterized by physicochemical and spectroscopic methods and X-ray structure determination. The mononuclear compounds 1, 2 and 4 contain one ligand molecule per metal atom while the manganese (II) atom in compound 3 is coordinated to two ligand molecules. Both ligands coordinated to the transition metal center in a tridentate fashion through two Npyridyl atoms and one Nimino atom. The chloride and acetate anions coordinate in monodentate manner, respectively, in complex 1 and in complex 2. In complex 3, the perchlorate groups remain uncoordinated. In complex 4, the nitrate anions act in unidentate fashion. The molar conductance value indicates that the complexes obtained from HL1 are non-electrolytes while those obtained from HL2 are 2:1 electrolytes in DMF solutions. The X-ray structures reveal octahedral geometry for complexes 1, 3, 4 and trigonal bipyramidal environment for 2.

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Authors and Affiliations

  1. Department of Chemistry, University Cheikh Anta Diop, BP 5192, Dakar, Fann, Senegal

    Amar Diop, Mamou Sarr, Mayoro Diop, Ibrahima Elhadj Thiam & Mohamed Gaye

  2. Department of Chemistry, University de Nouakchott, Nouakchott, Mauritanie

    Aliou Hamady Barry

  3. UK National Crystallography Service, School of Chemistry, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK

    Simon Coles & James Orton

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  1. Amar Diop
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  2. Mamou Sarr
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  3. Mayoro Diop
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  4. Ibrahima Elhadj Thiam
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Correspondence to Mohamed Gaye.

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Diop, A., Sarr, M., Diop, M. et al. Metal transition complexes of tridentate Schiff base ligands derived from 2-hydrazinopyridine: synthesis, spectroscopic characterization and X-ray structures. Transit Met Chem 44, 415–423 (2019). https://doi.org/10.1007/s11243-019-00317-3

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