Spin Crossover (SCO) Complexes are coordination complexes that exhibit huge changes in magnetic properties under external stimulus, and thus this abrupt change attracted attentions to be studied. This shift in property is a result of transition of the center metal between high-spin and low-spin states, which are two electronic states of the d orbital in the center metal ion, resulting from the transition of electrons in between two energy levels splitted by metal-ligand repulsion. This abrupt change in property also gives a wide range of applicability, e.g. switches, sensors, etc. In some cases, it also provides some insights into the nature of certain reactions. Previous scientific literature found gradual SCO behavior in Fe(II), but Co(II) discoveries remain limited. The goal of this experiment is to discover SCO behaviors of Co(II) complexes in a {N4S2} coordination sphere. The ligand TPMA was synthesized with a described method in literature, and the complex synthesis was planned by combining a mixture of starting materials and purified by crystallization, but still incomplete. Other group members synthesized several other ligands from last year. Spectroscopic techniques would be used for structural confirmation and properties determination. Theoretically, this study would give out whether this synthetic process would give out the expected product, and the magnetic properties of phase transitions, but it still needs further development. This study provided some plans and data to be collected for further work, and gave more understanding into coordination chemistry and inorganic chemistry overall.
Authors: Penny Feng,
Faculty Advisors: Vipul Batra and Dr. David L. Tierney, Department of Chemistry and Biochemistry
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