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Full-Text Articles in Physical Sciences and Mathematics
Syntheses And Reactions Of Early Transition Metal Amidinate Compounds, Adam Christopher Lamb
Syntheses And Reactions Of Early Transition Metal Amidinate Compounds, Adam Christopher Lamb
Doctoral Dissertations
Homoleptic Groups 4 and 5 metal amide compounds have been used as precursors in CVD/ALD processes to make microelectronic metal oxide thin films. These compounds are often very air sensitive. Ancillary ligands such as amidinates have been used to reduce their air sensitivity and to make their handling easier. Reactions of amidinates with dioxygen and water have thus been used to make metal oxide thin films. Studies of these reactions are important in order to make better precursors and purer thin films. This dissertation focuses on the following areas: (a) Syntheses of zirconium and Group 5 amidinate amides; (b) Studies …
The Development Of Lithium Tetraborate Compounds For Thermal Neutron Detection, John David Auxier Ii
The Development Of Lithium Tetraborate Compounds For Thermal Neutron Detection, John David Auxier Ii
Doctoral Dissertations
Due to the shortage of 3He [helium-3], the goal of this project was to develop replacement materials for slow neutron detection in mixed radiation fields. The U.S. Department of Homeland Security (DHS) indicated that replacement materials should have an absolute neutron efficiency of 2.5 cps/ng of 252Cf (Californium-252) and a neutron/gamma discrimination intrinsic efficiency of 1 x 10-6 [one gamma-ray response in a million counts]. In this work, the use of amorphous lithium tetraborate (Li2B4O7:Ce) is analyzed as a thermal neutron detector. Also discussed is the synthesis of the lithium tetraborate, …
Developing 16- And 18-Atom Ringed Macrocyclic Tetracarbene Complexes, Heather Marie Bass
Developing 16- And 18-Atom Ringed Macrocyclic Tetracarbene Complexes, Heather Marie Bass
Doctoral Dissertations
Stabilizing metal-ligand multiple bonds is important for the understanding of biological intermediates, as well as, for their use in group transfer reactions. Two considerations to make when developing a ligand system to support metal-ligand multiple bonds are the strength of the ligand and the symmetry of the ligand. Herein, our group has proposed a class of four-coordinate, strong σ-donor ligands by synthesizing macrocyclic tetraimidazoliums that form tetracarbenes upon deprotonation. By examining group theory, these systems should allow for the formation of complexes with metal-ligand multiple bonds in a bent square pyramidal geometry that exhibit high oxidation states and novel spin …
Syntheses, Characterization And Reactions Of Early Transition Metal Guanidinate And Imide Compounds, Bhavna Sharma
Syntheses, Characterization And Reactions Of Early Transition Metal Guanidinate And Imide Compounds, Bhavna Sharma
Doctoral Dissertations
Early transition metal compounds and their reactions have been widely used in catalysis and preparation of advanced materials such as metal oxides in microelectronic devices. Studies of the compounds and their reactions provide a fundamental understanding of chemistry of the compounds and are critical to their applications. This dissertation focuses on the following areas: (a) Reactions of Group 4 amide guanidinates with dioxygen or water; (b) Formation of a tantalum imide complex through an unusual α [alpha]-SiMe3 [trimethylsilyl] abstraction. Reactions of the amide guanidinates with either dioxygen or water yield products that are identified to be dimers and polymers …