PENTAGONAL BIPYRAMIDAL COMPLEXES OF Co(II) WITH SINGLY- AND DOUBLY-DEPROTONATED2′,2″-(2,6-PYRIDINDIYLDI-ETHYLIDENE)DIOXAMOHYDRAZIDE The Crystal Structure of [Diaqua-2′,2″-(2,6-Pyridindiyldiethylidene) Dioxamohydrazidecobalt(II)] Hexahydrate

Ivana Ivanović Faculty of Chemistry, University of Belgrade, P. O. B. 158, 11001, Belgrade, Yugoslavia

Katarina Andjelković Faculty of Chemistry, University of Belgrade, P. O. B. 158, 11001, Belgrade, Yugoslavia

Vladimir Beljanski Faculty of Chemistry, University of Belgrade, P. O. B. 158, 11001, Belgrade, Yugoslavia

Bogdan V. Prelesnik Laboratory of Condensed Matter Physics, Institute of Nuclear Sciences, “Vinca” P. O. B. 522, 11000, Belgrade, Yugoslavia

Vukadin M. Leovac Institute of Chemistry, Faculty of Sciences, Trg D. Obradovica 3, 21000, Novi Sad, Yugoslavia

Mirijana Momirović Institute of General and Physical Chemistry, P. O. B. 551, 11000, Belgrade, Yugoslavia

Abstract

This paper reports the first Co(II) complexes with a singly- and doubly-deprotonated H₂L ligand (H₂L = 2′,2″-(2,6-pyridindiyldiethylidene)dioxamohydrazide belonging to the planar pentadentate class. The complexes were characterized by elemental analysis, thermal analysis, IR spectroscopy, molar conductivity and magnetic susceptibility measurements. The crystal structure of [Co(L)(H₂O)₂] 6H₂O complex has been determined. The pentagonal bipyramidal geometry present in the previously synthesized complex [Co(H₂L)(H₂O)(MeOH)](ClO₄)₂, wherein the ligand is present in a neutral form, has been preserved around Co(II).

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PENTAGONAL BIPYRAMIDAL COMPLEXES OF Co(II) WITH SINGLY- AND DOUBLY-DEPROTONATED2′,2″-(2,6-PYRIDINDIYLDI-ETHYLIDENE)DIOXAMOHYDRAZIDE The Crystal Structure of [Diaqua-2′,2″-(2,6-Pyridindiyldiethylidene) Dioxamohydrazidecobalt(II)] Hexahydrate

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PENTAGONAL BIPYRAMIDAL COMPLEXES OF Co(II) WITH SINGLY- AND DOUBLY-DEPROTONATED2′,2″-(2,6-PYRIDINDIYLDI-ETHYLIDENE)DIOXAMOHYDRAZIDE The Crystal Structure of [Diaqua-2′,2″-(2,6-Pyridindiyldiethylidene) Dioxamohydrazidecobalt(II)] Hexahydrate

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