A new supramolecular coordination compound of Mg(II) with chelidamic acid: Synthesis, spectroscopic, crystal structures, and thermal analysis

ABSTRACT

A new supramolecular complex of Mg(II) was synthesized using 4-hydroxypyridine-2,6-dicarboxylic acid called chelidamic acid (hypydcH₂), 3,4-diaminopyridine, and magnesium nitrate, formulated as [Mg(hypydcH)₂(H₂O)₄] (1). Complex 1 was characterized by elemental analysis, IR, UV-Vis spectroscopy, thermal analysis, as well as single-crystal X-ray diffraction method. Two chelidamate anions have been coordinated to Mg(II) ion as monodentate ligands, and the remaining coordination sites were occupied by four water molecules. Interestingly, the structural analysis illustrates that the strong and weak O‒H···O, N‒H···O, and C‒H···O hydrogen bond accompanied with C‒O···π stacking interactions to assemble the crystal structure of 1 into a fascinating supramolecular architecture.

KEYWORDS:

• Spectroscopic
• crystal structure
• 4-hydroxyPyridine-2,6-dicarboxylic acid
• magnesium (II) complex