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Mercury has been an element of great industrial importance since early times. This wide utilization of the element has led to pervasive mercury contamination in the global environment. Due to mercury’s high toxicity, this is a matter of great concern. A number of methods, includ ing phytoremediation, filtration, and precipitation/chelation, have been investigated to remove mercury from the environment. Unfortunately, these methods are not entirely satisfactory for the in-situ remediation of mercury from aqueous environments. The hypothesis of this dissertation is that this can best be accomplished by the addition of a large and flexible sulfur-based chelate, that will bind mercury in a tetracoordinate and presumably tetrahedral environment, to mercury-contaminated waters. Although this proved difficult due to the tendency of these ligands to decompos