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Updated: May 15, 2025
Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
Phosphonocarboxylates in Mixed-Ligated Approach with Diverse Structural Features (0D to 3D), and Studies of
1Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, West Bengal, India.
Abstract:
Coordination compounds are an essential group of functional materials with different dimensionalities (0D, 1D, 2D, and 3D) depending on the metal atoms or organic linkers/ligands used. In this study, two different phosphonocarboxylates were combined with 4,4'-bipyridine (bpy) to create mixed-ligated coordination frameworks, resulting in three distinct coordination compounds with different dimensionalities: [Co(H2O)4(4,4'-bpy)2][H3L1]2∙10H2O (1) with 0D, {[Zn(H2L1)(4,4'-bpy)]·H2O}n (2) with 2D, and [Co(H2O)Co2(H2L2)2(4,4'-bpy)3]n (3) with 3D structure. Here, H4L1 = 5-Phosphonoisophthalic acid, and H5L2 = 3,5-Diphosphonobenzoic acid. Compound 1 had the most guest water molecules connected to the protonated phosphonate moieties and coordinated water molecules, creating extended hydrogen-bonding interactions among these three structures. Thereby, compound 1 was subjected to proton conductivity (PC) measurement, and revealed a PC value of 0.84 × 10-4 S cm-1 at 50 °C and 95% relative humidity (RH). A structural correlation was conducted with the previously reported similar guest-framework system, and a single point energy (with counterpoise = 2, basis set superposition error <0.003%) was calculated for the supramolecular architecture formed by the guest organic moiety and lattice water. Furthermore, non-covalent interactions were checked and compared.
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