Two Methods to Study Aggregation of Complexing Agents Used to Alter Solute Partitioning between Phases

Abstract For solute partition experiments involving a complexing agent in one phase, the equilibrium partitioning is a function of physical solubility and binding with the complexing agent. This equilibrium can be further complicated by one or more solute molecules binding to the complexing agent and the complexing agent existing as monomer or aggregate in solution. Two methods are presented to investigate these issues. First, an analysis procedure is presented which can determine the reaction equilibrium constants and monomer or dimer formation based on the results of total solute partitioning experiments. This is especially useful when the dimer is formed by aggregation and cannot be readily differentiated from the monomer by spectroscopic means. In addition, the shape of the total partitioning coefficient vs solute concentration curve can give an indication of the relative values of the reaction equilibrium constant. Second, an optically transparent thin-layer electrochemical cell (OTTLE) can be used t...

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