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(Presence of Supramolecule Interaction in New Coordination Polimer Compound Derive Ligand N,N’-2,6-bis(3- pyridylmethyl)pyridine Dicarboxyamide)

The presence of several supramolecular interactions such as hydrogen bonds and pi-pi arrangements are important not only to stabilize the molecular structure, but also to play a role as a host molecule. Therefore, in this study, an amide-based ligand that has a U shape namely N,N’-2,6-bis(3-pyridylmethyl)pyridine dicarboxamide (L1) was used as a ligand capable of forming hydrogen bonds with anions, and this study focusing on its role in the coordination polymer state. For a start, L1 was reacted with several transition metals via a slow evaporation method to produce three new coordination polymers. This coordination polymer has the molecular formula, {[Cd(L1)2(H2O)2](NO3)2.H2O}n (1), {[Cd(L1)2(H2O)2] (ClO4)2}n (2) dan {[Co(L1)2(H2O)2](NO3)2}n (3) characterized through elemental analysis, FTIR spectroscopy and X-ray crystallography. Coordination polymers 1, 2, and 3 crystallize in the triclinic system and the P-1 space group. The molecular conformation of these compounds is described as a dinuclear macrocyclic metal arranged like a necklace. L1 was found to connect through the central metal of the nitrogen atom, repeatedly to form a one-dimensional network. The molecular structure of this new compound is stabilized by the presence of intermolecular and intramolecular hydrogen bonds, which occur in the NH amide region, as well as the pi-pi arrangement between the pyridine aromatic rings. In this crystal structure as well, the methylene network forms a hydrogen bond with an anion counter on the 2,6-pyridine dicarboxamide moiety, indicating the potential of the compound as an anion acceptor. DFT study is carried out to investigate the interaction energies of the complexes.