Background: In recent years, many compounds of various metals (samarium (III), uranyl,
neodymium (III), copper (II), dysprosium (III), cobalt (II), zinc (II), hafnium, mercury (II)
and ..) with pyridine-2,5-dicarboxylic acid as ligand has been synthesized by different
methods.
Aim: Synthesis and characterization of some polymer and suparmolecular compounds is the
new goal of this project.
Methodology: The new compounds were characterized by X-ray diffraction and
crystallography, FT-IR, XRD, TGA-DTA, 1 HNMR, 13 CNMR, EDS and SEM techniques. The
Hirshfeld surfaces of compounds crystal packing and the fingerprint maps were used to
obtain data regarding non-covalent interactions.
Conclusions: A novel mercury coordination polymer, based on 2,5-pyridinedicarboxylic acid
and 2,4-diaminopyrimidine as ligands has been designed and synthesized by reflux method
and characterized by X-ray single crystal technique (compound (1)). Elemental, thermal, and
mass analysis; XRD, IR, 1 H NMR, 13 C NMR, EDS and SEM spectroscopic studies have been
performed to characterize the coordination polymer too. The structural analysis indicates that
the central metal atom (mercury) is six coordinated in the monoclinic crystal system with
space group P2 1 /c, Hg(II) ions are coordinated by one oxygen atom and one nitrogen atom
from the pyridine-5,2-dicarboxylic acid ligand and four chlorine atoms and possesses a
slightly distorted octahedral configuration. The 4,2-diaminopyrimidine ligand is not
coordinated with the central metal and is connected by ionic bonds, hydrogen bonds and -
bonds. This compound is a one-dimensional polymer and has a supramolecular structure in
three dimension. The intermolecular and intramolecular hydrogen bonds and π-π interactions
between aromatic rings play an important role on the additional stabilization to construct the
coordination polymer networks in the packing structure. Intermolecular and intramolecular
interactions, including hydrogen bonds such as (O...H, N