http://hdl.handle.net/10464/4 2013-06-19T05:02:01Z 2013-06-19T05:02:01Z ACHA, ROLAND http://hdl.handle.net/10464/4406 2013-06-06T06:01:32Z 2013-06-04T00:00:00Z

Ligand design for molecule-based magnetic and/or conducting materials ACHA, ROLAND Work in the area of molecule-based magnetic and/or conducting materials is presented in two projects. The first project describes the use of 4,4’-bipyridine as a scaffold for the preparation of a new family of tetracarboxamide ligands. Four new ligands I-III have been prepared and characterized and the coordination chemistry of these ligands is presented. This project was then extended to exploit 4,4’-bipyridine as a covalent linker between two N3O2 macrocyles. In this respect, three dimeric macrocycles have been prepared IV-VI. Substitution of the labile axial ligands of the Co(II) complex IV by [Fe(CN)6]4- afforded the self-assembly of the 1-D polymeric chain {[Co(N3O2)H2O]2Fe(CN)6}n•3H2O that has been structurally and magnetically characterized. Magnetic studies on the Fe(II) complexes V and VI indicate that they undergo incomplete spin crossover transitions in the solid state. Strategies for the preparation of chiral spin crossover N3O2 macrocycles are discussed and the synthesis of the novel chiral Fe(II) macrocyclic complex VII is reported. Magnetic susceptibility and Mössbauer studies reveal that this complex undergoes a gradual spin crossover in the solid state with no thermal hysteresis. Variable temperature X-ray diffraction studies on single crystals of VII reveal interesting structural changes in the coordination geometry of the macrocycle accompanying its SCO transition. The second project reports the synthesis and characterization of a new family of tetrathiafulvalene derivatives VIII – XII, where a heterocyclic chelating ligand is appended to a TTF donor via an imine linker. The coordination chemistries of these ligands with M(hfac)2.H2O (M( = Co, Ni, Mn, Cu) have been explored and the structural and magnetic properties of these complexes are described.

2013-06-04T00:00:00Z Macintosh, James http://hdl.handle.net/10464/4377 2013-05-16T06:00:40Z 2013-05-15T00:00:00Z

The Association between Tobacco Control Policies and Marijuana Use among Ontario Undergraduate Students Macintosh, James Background: Research indicates a steady increase in marijuana use and that it is concurrent with tobacco. There is speculation this concurrency reaches beyond use, to where policies aimed at reducing one may result in the reduction of the other. Purpose: To investigate the association between tobacco control policies and marijuana use among young adult undergraduates. Methods: A stratified sample of Ontario universities resulted in a sample of 4,966 participants. Results: Campuses with a moderately strong policy was found to be significantly associated with decreased marijuana use compared to campuses with a weak tobacco control policy. (OR=0.52, 95% CI: 0.36-0.76). Conclusions: The findings show tobacco control strategies are related to decreased odds of marijuana use among Ontario undergraduates. These findings are important to both policy makers and researchers interested in health strategies pertaining to marijuana and tobacco use and/or how health policies aimed at reducing one risk behaviour can affect another.

2013-05-15T00:00:00Z Jafri, Syed Rahat Ali http://hdl.handle.net/10464/4375 2013-05-15T06:00:42Z 2013-05-14T00:00:00Z

Managerial Risk-Taking and CEO Excess Compensation Jafri, Syed Rahat Ali This paper examines risk taking and CEO excess compensation problems in U.S firms to determine their impact on shareholders wealth. Literature suggests a positive effect of CEO incentive risk and strong corporate governance on CEO risk taking. Furthermore, the strong governance mitigates excess compensation problem. Controlling for governance quality and incentive risk, I provide empirical evidence of a significant association between risk taking and CEO excess compensation. When I also control for pay-performance sensitivity (delta) and feedback effects of incentive compensation on CEO risk taking, I find that higher use of incentive pay encourages risk taking, and due to a high exposure to risk CEOs draws excess compensation. Furthermore, I find that the excess compensation problem is more serious with CEOs taking high risk than with those taking low risk. Finally, I find that CEO risk taking also has structural impacts on CEO compensation

2013-05-14T00:00:00Z Zafar, Asma http://hdl.handle.net/10464/4374 2013-05-15T06:00:46Z 2013-05-14T00:00:00Z

Linking Ethical Leadership and Employees’ In-Role Performance: Exploring the Mediating Roles of Psychological Capital and Follower-Leader Relational Capital Zafar, Asma This study investigates the mediating impact of psychological capital and follower-leader relational capital on the relationship between ethical leadership and in-role performance through the lenses of social exchange theory, social information processing theory, and psychological resources theory. Analysis of data collected from a sample of 171 employees and 24 supervisors from Pakistan reveals that ethical leadership has a positive effect on followers’ in-role job performance, yet this effect is fully explained through the role of psychological capital and partially through follower-leader relational capital. Significant implications of these findings for further research and practice are discussed.

2013-05-14T00:00:00Z