Synthesis and Structure of Five Noncovalent-Bonded 1D–2D Mixed-Ligand Supramolecules Derived from Cd(OAc)2 with 2-Methylimidazole and Carboxylic Acids

Abstract

The hydrothermal reaction of the Cd(OAc)₂ with the 2-methylimidazole (mim) in the presence of the monocarboxylic acids produced five unpublished mim-derived coordination compounds of Cd(mim)₂(ibu)₂ (1) (Hibu = ibuprofen), Cd(mim)₂(sal)₂ (2) (Hsal = salicylic acid), Cd(mim)₂(pba)₂ (3) (Hpba = 3-phenoxybenzoic acid), Cd(mim)₂(tba)₂ (4) (Htba = 2,4,6-trichlorobenzoic acid), and Cd(mim)₂(tmba)₂ (5) (Htmba = 2,4,6-trimethoxybenzoic acid) and they are structurally characterized by the EA, IR spectra, TG and SCXRD analysis. The X-ray investigations declared that all these coordination compounds demonstrated the mononuclear graphs with the pseudo-tetrahedral/octahedral/square-pyramidal geometries around the Cd²⁺. The mim molecules take the coordination mode of the monodentate by only using its imidazole ring N atoms. The CO₂⁻ coordinated to the Cd²⁺ ion in monodentate, and chelating bidentate types. The intricate intra- and intermolecular traditional H-bonds are uncovered by the X-ray crystallographic studies, which mediate the discrete systems into the 1D–2D supramolecules.

Graphical Abstract

Five mononuclear Cd²⁺ complexes with the pseudo-tetrahedral/octahedral/square-pyramidal coordination geometries have been synthesized and characterized, the intricate intra- and intermolecular traditional H-bonds mediate the discrete systems into the 1D-2D supramolecules.