Interaction of hydrogen with accessible metal sites in the metal–organic frameworks M2(dhtp) (CPO-27-M; M = Ni, Co, Mg)

Hydrogen molecules adsorbed in the nickel, cobalt, and magnesium analogs of the CPO-27 metal-organic framework at low loadings interact significantly more strongly than those adsorbed successively as a consequence of the strong interaction of hydrogen with the coordinatively unsaturated metal cations in the framework.