Pyridyl Conjugated 1,2,3-Triazole is a Versatile Coordination Ability Ligand Enabling Supramolecular Associations

Four new complexes with 2-((4-phenyl-1H-1,2,3-triazol-1-yl)methyl)pyridine (ptmp) ligand: [Rh2(O2CCH3)4(ptmp)2] (1), [PdCl3(Hptmp)]·H2O (2), (Hptmp)2[AuCl4]Cl (3), and [Hg4Br8(ptmp)2]n (4) were prepared and their crystal structures were determined by single crystal X-ray diffraction analyses. Three nitrogen atoms of the ligand ptmp are prone to coordinate to the metal ions. In complex 1 ligand ptmp coordinates monodentately through the pyridyl N4 atom to the axial site of Rh. In compound 2 the N4 protonated ptmp, Hptmp+, coordinates Pd by the triazole N3 nitrogen atom. Ionic compound 3 is composed of three types of ions, Hptmp+, AuCl4−, and Cl−, interconnected by hydrogen bonds. Mercury complex 4 is a coordination polymer in which two ptmp ligands stabilize the Hg4Br8 chain, and the coordination involves N2 and N3 nitrogen atoms of the triazole and the pyridyl nitrogen atom N4. The crystal structures of 1−4 are dominated by hydrogen-bonding, C−H···π, and π−π stacking interactions. The potential of ptmp to enable supramolecular associations is examined.