The investigation of the self-assemblies of pyrogallol [4] arenes with large metal ions
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Supramolecular chemistry involves the study of the non-covalent interactions between molecules. Host molecules such as C-pyrogallol[4]arenes form complexes via these supramolecular interactions. Pyrogallol[4]arenes are known to interact with metal ions forming layered structures or metal-organic nanocapsules. Although interactions of these ligands with metal ions are widely known, their interactions with large metal ions are less explored. The current doctoral dissertation focuses on the interactions of pyrogallol[4]arene ligands with large metal ions. Interaction of C-ethylpyrogallol[4]arene with calcium ions led to the formation of two unprecedented dodecameric nanocapsules in the solid state with a large internal volume. Interaction of C-propylpyrogallol[4]arenes with barium ions led to the formation of 2D honeycomb-like networks from a dimeric nanocapsule of unusual M8L6 geometry. Additionally, upon introducing a defect in the form of a C-pentylpyrogallol[3]resorcin[1]arene, the assembly and nanocapsule had the ability to withstand a defect and maintain the structure. Furthermore, interactions of C-propylpyrogallol[4]arene with strontium ions led to the formation of a metal-organic nanotoroid with Sr10L8 geometry. To further explore the interaction of C- methylpyrogallol[4]arene with lanthanide ions such as praseodymium led to the formation of a 1D and 3D coordination networks of dimeric nanocapsules, and factors influencing the formation of these hierarchical self-assemblies are delineated. Besides, interaction of C-methyl and C-ethylpyrogallol[4]arene with cesium ions led to the formation of 2D coordination networks involving two supramolecular interactions. These studies have increased our understanding of the interaction of pyrogallol[4]arene with large metal ions and will further assist in creating functional materials and investigate applications, including pharmaceuticals.
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Ph. D.