Manganese, a period VIIB transition metal, has many interesting physical properties that allow it to play a major role in living organisms. For example, superoxide dismutase, a ubiquitous enzyme known for its antioxidant properties, can utilize manganese, copper, iron or nickel for this task due to their ability to change oxidation states. The coordination chemistry of the latter three metals is currently being investigated by a number of groups, however, little is known about the coordination chemistry of manganese thioether coordination complexes, and the long-term goal of this research is to understand this science. In this current study, the phenyltris-((tert-butylthio)methyl)boratothallium complex (PhBTt^tBuTl) was synthesized and then reacted with manganese in order to investigate the physical and chemical properties of the coordination complex. The ligand was synthesized by reacting tetraphenyl tin with trichloroborane to produce dichlorophenylborane followed by reaction with litium t-butylmethylsulfide to form PhBTt^tBuLi. The litium t-butylmethylsulfide was prepared from tert-butylmethylsulfide and n-butyl lithium. The PhBTt^tBuLi salt was converted to the PhBTt^tBuTl by reaction with Tl₂SO₄. The PhBTt^tBuTl was reacted with manganese (II) chloride to obtain [PhBTt^tBu]MnCl, whose chemistry will be investigated. Due to the difficulties in obtaining X-ray quality crystals of [PhBTt^tBu]MnCl, synthesis and characterization of the tetrafluoroborate salt [PhBTt^tBuMn][BF⁴] was attempted. Products of each reaction were characterized using stardard techniques including both mass spectrometry and nuclear magnetic resonance for the ligand and mass spectrometry and small molecule crystallography for the manganese complexes. A plan for future experiments is outlined.