Supramolecular Assemblies Formed by Cooperative Metal Coordination and Dimerization of the N‐(2‐pyrimidyl)‐N′‐(3‐pyridyl)urea Ligand via Hydrogen Bonding

The supramolecular structures of two metal complexes, [CoCl2L2] (1) and [ZnCl2L2] (2), where L = N-(2-pyrimidyl)-N′-(3-pyridyl)urea, are reported. The complexes feature zigzag chains formed by the self-dimerization of the ligand via a pair of Nurea–H···Npyrimidyl hydrogen bonds with the motif. Only the pyridyl nitrogen atom coordinates to the metal atom whereas the two pyrimidyl N donors are involved in intra- and intermolecular hydrogen bonding interactions. The coordinated Cl atoms do not form any hydrogen bonds with the urea NH groups. The dimerization of the ligand (K = 90 M−1) was investigated by 1H NMR spectroscopy.

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