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.