SYNTHESIS, CHARACTERIZATION, AND REACTIVITY OF LATE TRANSITION METALALUMINUM HETEROBIMETALLICS

Heterobimetallic systems have seen an increase in development over the last several years. These bimetallic systems typically involve two transition metals with unique properties used in tandem to activate chemical bonds. Many of these systems use transition metals, consisting of a soft, electron rich (low valent) metal and a harder, electron deficient (high valent) metal. These types of heterobimetallics can be exploited as an intramolecular Lewis acidLewis Base pair, which allows access to reactivity that may not be accessible to one transition metal alone.Relatively unexplored is the use of a late transition metal (LTM) in tandem with a Lewis-acidic p-block (Group 13) metal. LTM-Lewis acid bimetallic complexes can be broadly categorized into two separate families, both capable of cooperative activation of a chemical bond. Among Group 13 Lewis acids specifically, aluminum is of particular interest to the Brewster laboratory due to it being earth-abundant and the most electropositive Group 13 element. Bimetallic complexes that contain an aluminum moiety are relatively unexplored compared to their boron analogs due to being highly reactive species and their synthetic difficulty. This has made their isolation and characterization quite challenging. The goal of the Brewster lab is to develop bimetallic systems that contain aluminum and an electron-rich transition metal and to exploit cooperative reactivity between both metal centers. In this dissertation, we describe the successfully completed syntheses of bi- or tridentate ligands for our bimetallic aluminum complexes and their respective transition metal complexes. We report the experimental reactivity of the LTM complexes that contain a docking group for alkylaluminum or haloaluminum. Syntheses of these complexes follow a ligand first approach, where the LTM complex is first synthesized and isolated, followed by the addition of the aluminum moiety. This synthetic route has been successful in the development of several bimetallicaluminum complexes synthesized by the Brewster lab. We report the reactivity of the aluminum complexes with small molecules (i.e. H2, CO2, etc.). Varying the docking substituent attached to the aluminum moiety provides different reactivity. Experimental and computational investigation of the activation of CO2 are reported

The Impact of a Tutoring/Mentoring Program on Behaviors of Urban Elementary Students

The purpose of this study was to compare the behaviors of urban elementary students who were involved in a tutoring/mentoring program with urban elementary students who were not involved in a tutoring/mentoring program. The sample for this study consisted of 13 students enrolled in an urban elementary school in the metropolitan area. The study included five elementary classrooms involving students from grade one through grade three. The study incorporated a Quasi-Experimental Pretest-Posttest design. The control group consisted of elementary students who were tested and the experimental group which consisted of elementary students who were tested and also attended the tutoring/mentoring program. Using the convenience sample, subjects were placed in the experimental group of the control group dependent upon parental permission. The instrument used for data collection was the Child Behavior Checklist. ANCOVA was run on the data using the pretest as the covariate with alpha at .05. No significant difference was found between the control group and the experimental group. Sample size and inequivalent groups at the beginning of the experiment contributed to the lack of significant findings

Examining Biases and Prejudices: Implications for Art Education

In this paper, I combine an overview of Elisabeth Young-Bruehl’s (1996) socio-psychological examination of group prejudices with a critical examination of artwork by Juan Sánchez to illustrate how issues-based studies of works of art help teachers and students examine and resist biases and prejudices that contribute to oppressive or hegemonic actions

Development of a stable ultraviolet source and techniques for accurate radiometry Annual summary report, 1 Jan. - 31 Dec. 1965

Drawings and characteristics of small portable model of high pressure plasma arc source for stable accurate ultraviolet radiometr

Development of a stable ultraviolet source and techniques for accurate radiometry annual summary report, jan. 1 - dec. 31, 1964

Argon arc stable source of high ultraviolet radiation and high accuracy spectroradiometer for calibration of spectral radiation standard