Samantha De Abreu is a sophomore majoring in chemistry with a biochemistry emphasis. She is interested in utilizing green chemistry to minimize our impact on the environment and create a more sustainable society. Samantha is a CRLA certified tutor and enjoys helping other students learn about chemistry. She has worked as a PLUS facilitator, private tutor and a T.A. for chemistry labs during her time at eastern as well as participating in the ACS club and MeCHA. She hopes to attend graduate school and go on to do research and teach chemistry.
Abstract: Tuning single-ion anisotropy in molecular Ni(II) coordination complexes containing imidazole and pyrazole ligand types
While some molecular Ni(II) coordination complexes containing combinations of halide anions and organic ligands are known, truly systematic studies are lacking and often omit fluoride and iodide derivatives. We are especially interested in near-octahedral trans-coordinated NiN4X2 systems where X is F, Cl, Br, I and N is a donor atom belonging to an imidazole- or pyrazole-based ligand. The goal is to create high quality single crystals suitable for detailed structural and magnetic investigation. We aim to better understand the determining factors leading to single-ion anisotropy (D) while eliminating exchange interactions (J). Thus far, we have successfully synthesized several of the desired analogs and portions of this work, including X-ray crystallography, UV-Vis spectroscopy, pulsed-field magnetization, and electron-spin resonance will be presented.
Dr. Jamie Manson, Associate Professor, Department of Chemistry, EWU
TRiO McNair Research Internship:___________________________________________________________
Tuning Single-ion Anisotropy in Molecular Ni(II) Coordination Complexes Containing Imidazole and Pyrazole Analogs (2013)
While some structural data exists for Ni(II) molecular coordination complexes containing halide anions and organic ligands, the literature tends to be outdated and systematic studies using chemical tunability have not been performed, often leaving out complexes containing the less commonly utilized members of the halide family, Fluoride and Iodide. Synthesis of these compounds has been carried out using Ni(II) coordinated to 2 halides and 4 organic ligands where the Halide is F,Cl,Br,I and the ligand can be a variety of organic molecules such as imidazole, benzimidazole, pyrazole or 4-methyl-1H-pyrazole. The goal is to create high quality singular crystals which can then undergo various instrumental testing. Once synthesized, these molecular complexes have an advantage over polymers in that they provide us with the unique opportunity to study the single-ion anisotropy (J) of the system while minimizing the interference of exchange interactions (J). Pulsed field data, electron resonance spectroscopy and x-ray data can provide additional insight into magnetic and structural properties of these materials and allow for a comparison of theoretical models to experimental data.
Honors and Awards:______________________________________________________________________
phone: 509.359.6200 (campus operator)
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