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Equilibrium methods were used to measure binding energies and entropies for the attachment of up to six H2 ligands to ground-state Cu2 + (2Σg, 3d20 σ). Bond dissociation energies (BDEs) of the first five H2 ligands added to ground-state Cu2 + are 12.4, 10.1, 4.9, 3.8, and 2.1 kcal/mol respectively, with the BDE of the sixth ligand approximated to be 1.7 kcal/mol. Entropy measurements indicated all six of the H2 ligands were in the first solvation shell. Theoretical calculations at the DFT-B3LYP level were done on Cu2 + for the first four H2 ligands. Vibrational frequencies and geometries were determined, and the origin of the bonding and its variation with Cu2 + coordination was examined. Comparisons are made to the Cu+(H2) n and Zn+(H2) n systems.