Coordination and supramolecular chemistry of aromatic N-oxides
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Aromatic N-oxides are a special class of heterocyclic aromatic compounds containing exo-cyclic N-oxo functionality. They are a class of useful ligand for the generation of coordination complexes as well as supramolecular architectures especially coordination polymers. Being an exo-dentate ligand N-oxide possesses a number of coordination and hydrogen bond modes. Depending on these possible modes, different supramolecular architectures are designed. Stability of these architectures is guided by supramolecular interactions like hydrogen bonding, - stacking or weak electrostatic interactions exhibited by the N-oxide ligands. This thesis deals with the studies on synthesis, characterization and structural aspects of a number of coordination polymers and molecular complexes of aromatic N-oxides. An important aspect of the study is the synthetic route of the coordination polymers. Generally the coordination polymers are synthesized using solvothermal methodologies. Such synthetic methodologies may lose informations regarding any intermediate products or kinetic products. The coordination polymers reported here are synthesized under mild solution state reaction conditions. In a couple of instances intermediate species formed during coordination polymerization are isolated and characterized which is not possible in solvothermal process. Electronic spectral properties and magnetic behavior of some of the coordination polymers are studied. Moreover, suitable conditions to synthesize metal containing molecular complexes of aromatic N-oxides are explored and presented...
Supervisor: Jubaraj B. Baruah