Abstract: Relative two-ligand dissociation enthalpies, 6D (Cu+-2L), for Cu+ with 43 organic molecules are determined. A pulsed-laser volatilization/ionization source is used to generate Cu+ which reacts with EtCl and/or other molecules to give Cu (ligand) 2+ species. Equilibrium constants are measured for the ligand-exchange reactions which occur when pairs of ligand molecules are present. Free energies for two-ligand exchange are ...