Abstract
Layered metal-organic polymer [Co(L)6](NO3)2 was obtained (where, L = C3H4N2) and structurally characterized by X-Ray diffraction (XRD) analysis. Crystals have trigonal structure: a = b = 12.3555(10) Ǻ, c = 14.4833(3) Ǻ; α = β = 90˚; γ = 120˚; V = 1914.78(5) Ǻ; R3, Z = 3. The structure of the complex consists of discrete [Co(L)6]2+ cations and anions. The Co2+ ion has a centrosymmetric octahedron configuration with a coordination site—CoN6. The ligand is coordinated monodentate through the pyridine nitrogen atom (N3) to the Co2+ ion with an average Co-N bond distance of 2.1590 Ǻ. Molecules in the coordination polymer are additionally linked by intermolecular hydrogen bonds through the pyrrole nitrogen atom (-N-H) and oxygen of the nitrate group with the formation of a polymer chain of the type: N-H…O. The chains are linked in layers along the (001) plane.
Highlights
Metal-organic coordination polymers of the compound of 3d-metals with multidentate ligands can be considered as precursors for the creation of organic hybrid materials
Imidazole can participate in the formation of hydrogen bonds through the -N-H groups of imidazole with the counter ion ( NO3− ), creating supramolecular assemblies
The complex was obtained by the interaction of cobalt nitrate with imidazole according to the well-known method [7]
Summary
The latter should include magnetoactive [1], luminescent [2], sorption [3] and bioactive [4] properties. The preparation of coordination polymers of various types (linear, chain, layered, framework) [5] depends on many factors, such as the coordination preference of metals, geometric characteristics of organic ligands, the nature of counterions, etc. Among the ligands suitable for the synthesis of compounds with the above-mentioned properties, such a ligand likes an imidazole containing two different nitrogen atoms: pyridine and pyrrole. This work presents the results of synthesis, IRS, DTG, X-ray structural analysis of the layered metal-organic polymer [Co(L)6](NO3) (I)
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