Abstract Transition metal Schiff base complexes continue to be the subject of extensive research because of their catalytic roles, which includes Jacobsen-Katsuki asymmetric epoxidation catalyst, Photo-system II models, water photo-oxidation catalysts and hydrogen peroxide activators, so that a lot of the research concerns modifying the coordinating groups in order to direct the stereochemistry around the metal centre. This thesis deals with synthesis and characterization of manganese salen carboxylic acid complexes and is divided into six chapters: Chapter 1 gives a general introduction to the chemistry of manganese and Schiff base ligands followed by a review of manganese Schiff base complexes including their applications. Chapter 2 provides a review of x-ray crystallography. Chapter 3 describes attempts at small scale synthesis and crystallization of manganese salen complexes and successful synthesis and characterization of a manganese salen pivalate complex. In chapter 4 multi-temperature crystallographic studies of the manganese salen pivalate complex are described. Chapter 5 presents the structures of six manganese salen carboxylate complexes and has allowed to extend this study by changing pivalate for other carboxylate ligands, such as isobutyrate, cyclohexane carboxylate and bicyclo2.2.1 heptane 2 carboxylate. The first synthesis attempts to use manganese(II) acetate as starting material but only produced a novel manganese salen acetate polymorph. However using manganese carbonate as starting material five novel manganese salen carboxylate were synthesized. Chapter 6, the final chapter, presents the conclusions and suggestions for further work.
|Date of Award
|31 Dec 2018
- The University of Manchester
|Robin Pritchard (Supervisor) & Peter Quayle (Supervisor)