A Rare Example of a Dinuclear Cobalt(II) Complex with Dipicolinate and Bridging 2-Aminopyrazine Ligands. Preparation, Structural, Spectroscopic and Thermal Characterization
Zeitschrift für Naturforschung. B, A journal of chemical sciences
A dinuclear cobalt(II) complex, [Co 2 (H 2 O) 4 (dipic) 2 (µ-apyz)] (dipicH 2 = pyridine-2,6-dicarboxylic (dipicolinic) acid, apyz = 2-aminopyrazine) (1), has been hydrothermally synthesized and characterized by elemental analyses, spectroscopic methods (IR, UV/Vis), thermal analysis as well as by X-ray diffraction studies. The dinuclear complex is composed of two cobalt(II) ions bridged by a 2-aminopyrazine molecule. Each cobalt(II) ion is coordinated by one nitrogen and two oxygen atoms of
... oxygen atoms of the tridentate dipicolinate anion, one heterocyclic nitrogen atom of the 2-aminopyrazine and two oxygen atoms of coordinated water molecules. The resulting geometry for the CoN 2 O 4 coordination environment can be described as distorted octahedral. Various hydrogen bonds of the type O-H··· O and N-H··· O are also present in the crystal structure. This arrangement leads to the formation of a 3D structure.