Metal-organic framework (MOF) compounds: synthesis, structure and catalytic studies

includes bibliographical references and index

PhD; 2023; Solid State and Structural Chemistry Unit

The metal-organic framework (MOF) compounds exhibit interesting developments in coordination chemistry, materials science and other branches of chemistry. These compounds have potential applications in diverse fields that include gas separation, storage, catalysis, conductivity and water purification, etc. The MOFs are a class of crystalline inorganic-organic hybrid compounds formed with metal nodes and organic linking units. Such compounds can be prepared either by one-pot synthesis or by sequential synthesis. In one-pot synthesis, the organic linkers with binding sites are directly allowed to interact with the metal salts in a single pot. On the other hand, in sequential synthesis, the pre-prepared metalloligand as precursor mixture interacts with the second metal ions in a sequential manner. In the current work, the synthesis of new metal-organic framework (MOF) compounds by employing one-pot as well as sequential synthesis has been attempted. The structures of the compounds have been determined by employing the single-crystal X-ray diffraction technique. The prepared compounds possess both Lewis acidic and basic centers, which were exploited for catalytic studies. The catalytically active sites were employed to catalyze single-step as well as multiple-step reactions in a tandem fashion. Some of the compounds exhibit water adsorption and proton conductivity behavior. In addition, the thermochromic behavior of the framework compounds has been described in detail. Chapter 1 presents a brief overview of metal-organic framework (MOF) compounds and their various important properties. In chapter 2, the synthesis, structure and Lewis acid catalytic studies of heterometallic metal-organic framework compounds using Cu(I)/Ag(I) based metalloligand, [M6(2-mna)6] 6- (M = Cu+ /Ag+ ; H2mna = 2-mercaptonicotinic acid) and Cd2+ are presented. In chapter 3, the synthesis, structure, thermochromism and Lewis acid catalytic behavior of [Cu6(2-mna)6]6-based heterometallic metal-organic framework compound are presented. In chapter 4, we present the synthesis, structure and Lewis acid-base catalytic studies of 1,4-naphthalene dicarboxylic acid based metal-organic framework compounds. In chapter 5, the synthesis, structure and one-pot tandem catalytic studies of bi functional metal-organic framework compounds are presented. In chapter 6, the synthesis, structure and multi-step tandem catalytic studies of 3- amino triazole based metal-organic framework compounds are presented.