Author(s)

Thierno Moussa Seck¹, Adama Sy², Djiby Lo¹, Papa Aly Gaye³, Mohamed Lamine Sall¹, Ousmane Diouf¹, Mahy Diaw¹, Mohamed Gaye^1*

¹Department of Chemistry, University Cheikh Anta Diop, Dakar, Senegal.
²Department of Chemistry, University Gaston Berger, Saint-Louis, Senegal.
³Department of Chemistry, University Assane SECK, Ziguinchor, Senegal.

The ligand 1-(1-(pyridin-2-yl)ethylidene)carbonohydrazide (H₄L¹) and 1-(pyridin-2-ylmethylene)carbonohydrazide (H₄L²) were prepared by reaction of carbonohydrazide with 2-acetylpyridine or pyridine carbaldehyde respectively in a reflux methanol solution. The complexes are prepared by reaction of the ligand with the appropriate metal salt. These complexes are well characterized by elemental analysis, IR and UV spectroscopies and their structure were determined by single X-ray diffraction technic. In the crystal of the dinuclear complex [Mn₂(H₄L¹)₂(H₂O)₄]·Cl₄, 1) each Mn(II) center is seven coordinated by two nitrogen atom and one carbonyl atom of the one ligand and one nitrogen atom and one carbonyl oxygen atom of another ligand molecule. The coordination sphere is completed by two water molecules. Each of the carbonyl oxygen atom acts as bridge between the two Mn(II) centers. In the mononuclear complex [Co(H₄L²)(NO₃)(H₂O)₂]·(NO₃); 2) the Co(II) center is heptacoordinated. The ligand acts in tridentate fashion through two nitrogen atoms and one carbonyl oxygen atom. Two water molecules lie in the apical positions. One nitrate group acts in bidentate manner while the other nitrate group remains uncoordinated. In both complexes the coordination polyhedral are best described as a pentagonal bipyramid. The molecules are linked together in each case by multiple hydrogen bond interaction resulting in a three-dimensional network. The crystallographic data has been deposited in Cambridge Crystallographic Data Centre [CCDC No. 1944387 (complex 1) and 1944386 (complex 2)].

Carbonohydrazide, Manganese, Cobalt, Complex, X-Ray Diffraction

Seck, T. , Sy, A. , Lo, D. , Gaye, P. , Sall, M. , Diouf, O. , Diaw, M. and Gaye, M. (2019) Synthesis, Spectroscopic Studies and X-Ray Diffraction of Heptacoordinated Mn(II) and Co(II) Complexes with Ligands Derived from Carbonohydrazide. Open Journal of Inorganic Chemistry, 9, 35-52. doi: 10.4236/ojic.2019.94004.